drivers/usb/core/devio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*****************************************************************************/
   3
   4 /*
   5  *      devio.c  --  User space communication with USB devices.
   6  *
   7  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   8  *
   9  *  This file implements the usbfs/x/y files, where
  10  *  x is the bus number and y the device number.
  11  *
  12  *  It allows user space programs/"drivers" to communicate directly
  13  *  with USB devices without intervening kernel driver.
  14  *
  15  *  Revision history
  16  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  17  *    04.01.2000   0.2   Turned into its own filesystem
  18  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  19  *                       (CAN-2005-3055)
  20  */
  21
  22 /*****************************************************************************/
  23
  24 #include <linux/fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/signal.h>
  29 #include <linux/poll.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/usb.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/usb/hcd.h>      /* for usbcore internals */
  35 #include <linux/usb/quirks.h>
  36 #include <linux/cdev.h>
  37 #include <linux/notifier.h>
  38 #include <linux/security.h>
  39 #include <linux/user_namespace.h>
  40 #include <linux/scatterlist.h>
  41 #include <linux/uaccess.h>
  42 #include <linux/dma-mapping.h>
  43 #include <asm/byteorder.h>
  44 #include <linux/moduleparam.h>
  45
  46 #include "usb.h"
  47
  48 #ifdef CONFIG_PM
  49 #define MAYBE_CAP_SUSPEND       USBDEVFS_CAP_SUSPEND
  50 #else
  51 #define MAYBE_CAP_SUSPEND       0
  52 #endif
  53
  54 #define USB_MAXBUS                      64
  55 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  56 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  57
  58 /* Mutual exclusion for ps->list in resume vs. release and remove */
  59 static DEFINE_MUTEX(usbfs_mutex);
  60
  61 struct usb_dev_state {
  62         struct list_head list;      /* state list */
  63         struct usb_device *dev;
  64         struct file *file;
  65         spinlock_t lock;            /* protects the async urb lists */
  66         struct list_head async_pending;
  67         struct list_head async_completed;
  68         struct list_head memory_list;
  69         wait_queue_head_t wait;     /* wake up if a request completed */
  70         wait_queue_head_t wait_for_resume;   /* wake up upon runtime resume */
  71         unsigned int discsignr;
  72         struct pid *disc_pid;
  73         const struct cred *cred;
  74         sigval_t disccontext;
  75         unsigned long ifclaimed;
  76         u32 disabled_bulk_eps;
  77         unsigned long interface_allowed_mask;
  78         int not_yet_resumed;
  79         bool suspend_allowed;
  80         bool privileges_dropped;
  81 };
  82
  83 struct usb_memory {
  84         struct list_head memlist;
  85         int vma_use_count;
  86         int urb_use_count;
  87         u32 size;
  88         void *mem;
  89         dma_addr_t dma_handle;
  90         unsigned long vm_start;
  91         struct usb_dev_state *ps;
  92 };
  93
  94 struct async {
  95         struct list_head asynclist;
  96         struct usb_dev_state *ps;
  97         struct pid *pid;
  98         const struct cred *cred;
  99         unsigned int signr;
 100         unsigned int ifnum;
 101         void __user *userbuffer;
 102         void __user *userurb;
 103         sigval_t userurb_sigval;
 104         struct urb *urb;
 105         struct usb_memory *usbm;
 106         unsigned int mem_usage;
 107         int status;
 108         u8 bulk_addr;
 109         u8 bulk_status;
 110 };
 111
 112 static bool usbfs_snoop;
 113 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 114 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 115
 116 static unsigned usbfs_snoop_max = 65536;
 117 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 118 MODULE_PARM_DESC(usbfs_snoop_max,
 119                 "maximum number of bytes to print while snooping");
 120
 121 #define snoop(dev, format, arg...)                              \
 122         do {                                                    \
 123                 if (usbfs_snoop)                                \
 124                         dev_info(dev, format, ## arg);          \
 125         } while (0)
 126
 127 enum snoop_when {
 128         SUBMIT, COMPLETE
 129 };
 130
 131 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 132
 133 /* Limit on the total amount of memory we can allocate for transfers */
 134 static u32 usbfs_memory_mb = 16;
 135 module_param(usbfs_memory_mb, uint, 0644);
 136 MODULE_PARM_DESC(usbfs_memory_mb,
 137                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 138
 139 /* Hard limit, necessary to avoid arithmetic overflow */
 140 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 141
 142 static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
 143 static u64 usbfs_memory_usage;  /* Total memory currently allocated */
 144
 145 /* Check whether it's okay to allocate more memory for a transfer */
 146 static int usbfs_increase_memory_usage(u64 amount)
 147 {
 148         u64 lim, total_mem;
 149         unsigned long flags;
 150         int ret;
 151
 152         lim = READ_ONCE(usbfs_memory_mb);
 153         lim <<= 20;
 154
 155         ret = 0;
 156         spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
 157         total_mem = usbfs_memory_usage + amount;
 158         if (lim > 0 && total_mem > lim)
 159                 ret = -ENOMEM;
 160         else
 161                 usbfs_memory_usage = total_mem;
 162         spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
 163
 164         return ret;
 165 }
 166
 167 /* Memory for a transfer is being deallocated */
 168 static void usbfs_decrease_memory_usage(u64 amount)
 169 {
 170         unsigned long flags;
 171
 172         spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
 173         if (amount > usbfs_memory_usage)
 174                 usbfs_memory_usage = 0;
 175         else
 176                 usbfs_memory_usage -= amount;
 177         spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
 178 }
 179
 180 static int connected(struct usb_dev_state *ps)
 181 {
 182         return (!list_empty(&ps->list) &&
 183                         ps->dev->state != USB_STATE_NOTATTACHED);
 184 }
 185
 186 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 187 {
 188         struct usb_dev_state *ps = usbm->ps;
 189         unsigned long flags;
 190
 191         spin_lock_irqsave(&ps->lock, flags);
 192         --*count;
 193         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 194                 list_del(&usbm->memlist);
 195                 spin_unlock_irqrestore(&ps->lock, flags);
 196
 197                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 198                                 usbm->dma_handle);
 199                 usbfs_decrease_memory_usage(
 200                         usbm->size + sizeof(struct usb_memory));
 201                 kfree(usbm);
 202         } else {
 203                 spin_unlock_irqrestore(&ps->lock, flags);
 204         }
 205 }
 206
 207 static void usbdev_vm_open(struct vm_area_struct *vma)
 208 {
 209         struct usb_memory *usbm = vma->vm_private_data;
 210         unsigned long flags;
 211
 212         spin_lock_irqsave(&usbm->ps->lock, flags);
 213         ++usbm->vma_use_count;
 214         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 215 }
 216
 217 static void usbdev_vm_close(struct vm_area_struct *vma)
 218 {
 219         struct usb_memory *usbm = vma->vm_private_data;
 220
 221         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 222 }
 223
 224 static const struct vm_operations_struct usbdev_vm_ops = {
 225         .open = usbdev_vm_open,
 226         .close = usbdev_vm_close
 227 };
 228
 229 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 230 {
 231         struct usb_memory *usbm = NULL;
 232         struct usb_dev_state *ps = file->private_data;
 233         struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
 234         size_t size = vma->vm_end - vma->vm_start;
 235         void *mem;
 236         unsigned long flags;
 237         dma_addr_t dma_handle;
 238         int ret;
 239
 240         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 241         if (ret)
 242                 goto error;
 243
 244         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 245         if (!usbm) {
 246                 ret = -ENOMEM;
 247                 goto error_decrease_mem;
 248         }
 249
 250         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 251                         &dma_handle);
 252         if (!mem) {
 253                 ret = -ENOMEM;
 254                 goto error_free_usbm;
 255         }
 256
 257         memset(mem, 0, size);
 258
 259         usbm->mem = mem;
 260         usbm->dma_handle = dma_handle;
 261         usbm->size = size;
 262         usbm->ps = ps;
 263         usbm->vm_start = vma->vm_start;
 264         usbm->vma_use_count = 1;
 265         INIT_LIST_HEAD(&usbm->memlist);
 266
 267         if (hcd->localmem_pool || !hcd_uses_dma(hcd)) {
 268                 if (remap_pfn_range(vma, vma->vm_start,
 269                                     virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 270                                     size, vma->vm_page_prot) < 0) {
 271                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 272                         return -EAGAIN;
 273                 }
 274         } else {
 275                 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
 276                                       size)) {
 277                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 278                         return -EAGAIN;
 279                 }
 280         }
 281
 282         vma->vm_flags |= VM_IO;
 283         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 284         vma->vm_ops = &usbdev_vm_ops;
 285         vma->vm_private_data = usbm;
 286
 287         spin_lock_irqsave(&ps->lock, flags);
 288         list_add_tail(&usbm->memlist, &ps->memory_list);
 289         spin_unlock_irqrestore(&ps->lock, flags);
 290
 291         return 0;
 292
 293 error_free_usbm:
 294         kfree(usbm);
 295 error_decrease_mem:
 296         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 297 error:
 298         return ret;
 299 }
 300
 301 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 302                            loff_t *ppos)
 303 {
 304         struct usb_dev_state *ps = file->private_data;
 305         struct usb_device *dev = ps->dev;
 306         ssize_t ret = 0;
 307         unsigned len;
 308         loff_t pos;
 309         int i;
 310
 311         pos = *ppos;
 312         usb_lock_device(dev);
 313         if (!connected(ps)) {
 314                 ret = -ENODEV;
 315                 goto err;
 316         } else if (pos < 0) {
 317                 ret = -EINVAL;
 318                 goto err;
 319         }
 320
 321         if (pos < sizeof(struct usb_device_descriptor)) {
 322                 /* 18 bytes - fits on the stack */
 323                 struct usb_device_descriptor temp_desc;
 324
 325                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 326                 le16_to_cpus(&temp_desc.bcdUSB);
 327                 le16_to_cpus(&temp_desc.idVendor);
 328                 le16_to_cpus(&temp_desc.idProduct);
 329                 le16_to_cpus(&temp_desc.bcdDevice);
 330
 331                 len = sizeof(struct usb_device_descriptor) - pos;
 332                 if (len > nbytes)
 333                         len = nbytes;
 334                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 335                         ret = -EFAULT;
 336                         goto err;
 337                 }
 338
 339                 *ppos += len;
 340                 buf += len;
 341                 nbytes -= len;
 342                 ret += len;
 343         }
 344
 345         pos = sizeof(struct usb_device_descriptor);
 346         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 347                 struct usb_config_descriptor *config =
 348                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 349                 unsigned int length = le16_to_cpu(config->wTotalLength);
 350
 351                 if (*ppos < pos + length) {
 352
 353                         /* The descriptor may claim to be longer than it
 354                          * really is.  Here is the actual allocated length. */
 355                         unsigned alloclen =
 356                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 357
 358                         len = length - (*ppos - pos);
 359                         if (len > nbytes)
 360                                 len = nbytes;
 361
 362                         /* Simply don't write (skip over) unallocated parts */
 363                         if (alloclen > (*ppos - pos)) {
 364                                 alloclen -= (*ppos - pos);
 365                                 if (copy_to_user(buf,
 366                                     dev->rawdescriptors[i] + (*ppos - pos),
 367                                     min(len, alloclen))) {
 368                                         ret = -EFAULT;
 369                                         goto err;
 370                                 }
 371                         }
 372
 373                         *ppos += len;
 374                         buf += len;
 375                         nbytes -= len;
 376                         ret += len;
 377                 }
 378
 379                 pos += length;
 380         }
 381
 382 err:
 383         usb_unlock_device(dev);
 384         return ret;
 385 }
 386
 387 /*
 388  * async list handling
 389  */
 390
 391 static struct async *alloc_async(unsigned int numisoframes)
 392 {
 393         struct async *as;
 394
 395         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 396         if (!as)
 397                 return NULL;
 398         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 399         if (!as->urb) {
 400                 kfree(as);
 401                 return NULL;
 402         }
 403         return as;
 404 }
 405
 406 static void free_async(struct async *as)
 407 {
 408         int i;
 409
 410         put_pid(as->pid);
 411         if (as->cred)
 412                 put_cred(as->cred);
 413         for (i = 0; i < as->urb->num_sgs; i++) {
 414                 if (sg_page(&as->urb->sg[i]))
 415                         kfree(sg_virt(&as->urb->sg[i]));
 416         }
 417
 418         kfree(as->urb->sg);
 419         if (as->usbm == NULL)
 420                 kfree(as->urb->transfer_buffer);
 421         else
 422                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 423
 424         kfree(as->urb->setup_packet);
 425         usb_free_urb(as->urb);
 426         usbfs_decrease_memory_usage(as->mem_usage);
 427         kfree(as);
 428 }
 429
 430 static void async_newpending(struct async *as)
 431 {
 432         struct usb_dev_state *ps = as->ps;
 433         unsigned long flags;
 434
 435         spin_lock_irqsave(&ps->lock, flags);
 436         list_add_tail(&as->asynclist, &ps->async_pending);
 437         spin_unlock_irqrestore(&ps->lock, flags);
 438 }
 439
 440 static void async_removepending(struct async *as)
 441 {
 442         struct usb_dev_state *ps = as->ps;
 443         unsigned long flags;
 444
 445         spin_lock_irqsave(&ps->lock, flags);
 446         list_del_init(&as->asynclist);
 447         spin_unlock_irqrestore(&ps->lock, flags);
 448 }
 449
 450 static struct async *async_getcompleted(struct usb_dev_state *ps)
 451 {
 452         unsigned long flags;
 453         struct async *as = NULL;
 454
 455         spin_lock_irqsave(&ps->lock, flags);
 456         if (!list_empty(&ps->async_completed)) {
 457                 as = list_entry(ps->async_completed.next, struct async,
 458                                 asynclist);
 459                 list_del_init(&as->asynclist);
 460         }
 461         spin_unlock_irqrestore(&ps->lock, flags);
 462         return as;
 463 }
 464
 465 static struct async *async_getpending(struct usb_dev_state *ps,
 466                                              void __user *userurb)
 467 {
 468         struct async *as;
 469
 470         list_for_each_entry(as, &ps->async_pending, asynclist)
 471                 if (as->userurb == userurb) {
 472                         list_del_init(&as->asynclist);
 473                         return as;
 474                 }
 475
 476         return NULL;
 477 }
 478
 479 static void snoop_urb(struct usb_device *udev,
 480                 void __user *userurb, int pipe, unsigned length,
 481                 int timeout_or_status, enum snoop_when when,
 482                 unsigned char *data, unsigned data_len)
 483 {
 484         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 485         static const char *dirs[] = {"out", "in"};
 486         int ep;
 487         const char *t, *d;
 488
 489         if (!usbfs_snoop)
 490                 return;
 491
 492         ep = usb_pipeendpoint(pipe);
 493         t = types[usb_pipetype(pipe)];
 494         d = dirs[!!usb_pipein(pipe)];
 495
 496         if (userurb) {          /* Async */
 497                 if (when == SUBMIT)
 498                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 499                                         "length %u\n",
 500                                         userurb, ep, t, d, length);
 501                 else
 502                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 503                                         "actual_length %u status %d\n",
 504                                         userurb, ep, t, d, length,
 505                                         timeout_or_status);
 506         } else {
 507                 if (when == SUBMIT)
 508                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 509                                         "timeout %d\n",
 510                                         ep, t, d, length, timeout_or_status);
 511                 else
 512                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 513                                         "status %d\n",
 514                                         ep, t, d, length, timeout_or_status);
 515         }
 516
 517         data_len = min(data_len, usbfs_snoop_max);
 518         if (data && data_len > 0) {
 519                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 520                         data, data_len, 1);
 521         }
 522 }
 523
 524 static void snoop_urb_data(struct urb *urb, unsigned len)
 525 {
 526         int i, size;
 527
 528         len = min(len, usbfs_snoop_max);
 529         if (!usbfs_snoop || len == 0)
 530                 return;
 531
 532         if (urb->num_sgs == 0) {
 533                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 534                         urb->transfer_buffer, len, 1);
 535                 return;
 536         }
 537
 538         for (i = 0; i < urb->num_sgs && len; i++) {
 539                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 540                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 541                         sg_virt(&urb->sg[i]), size, 1);
 542                 len -= size;
 543         }
 544 }
 545
 546 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 547 {
 548         unsigned i, len, size;
 549
 550         if (urb->number_of_packets > 0)         /* Isochronous */
 551                 len = urb->transfer_buffer_length;
 552         else                                    /* Non-Isoc */
 553                 len = urb->actual_length;
 554
 555         if (urb->num_sgs == 0) {
 556                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 557                         return -EFAULT;
 558                 return 0;
 559         }
 560
 561         for (i = 0; i < urb->num_sgs && len; i++) {
 562                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 563                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 564                         return -EFAULT;
 565                 userbuffer += size;
 566                 len -= size;
 567         }
 568
 569         return 0;
 570 }
 571
 572 #define AS_CONTINUATION 1
 573 #define AS_UNLINK       2
 574
 575 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 576 __releases(ps->lock)
 577 __acquires(ps->lock)
 578 {
 579         struct urb *urb;
 580         struct async *as;
 581
 582         /* Mark all the pending URBs that match bulk_addr, up to but not
 583          * including the first one without AS_CONTINUATION.  If such an
 584          * URB is encountered then a new transfer has already started so
 585          * the endpoint doesn't need to be disabled; otherwise it does.
 586          */
 587         list_for_each_entry(as, &ps->async_pending, asynclist) {
 588                 if (as->bulk_addr == bulk_addr) {
 589                         if (as->bulk_status != AS_CONTINUATION)
 590                                 goto rescan;
 591                         as->bulk_status = AS_UNLINK;
 592                         as->bulk_addr = 0;
 593                 }
 594         }
 595         ps->disabled_bulk_eps |= (1 << bulk_addr);
 596
 597         /* Now carefully unlink all the marked pending URBs */
 598  rescan:
 599         list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
 600                 if (as->bulk_status == AS_UNLINK) {
 601                         as->bulk_status = 0;            /* Only once */
 602                         urb = as->urb;
 603                         usb_get_urb(urb);
 604                         spin_unlock(&ps->lock);         /* Allow completions */
 605                         usb_unlink_urb(urb);
 606                         usb_put_urb(urb);
 607                         spin_lock(&ps->lock);
 608                         goto rescan;
 609                 }
 610         }
 611 }
 612
 613 static void async_completed(struct urb *urb)
 614 {
 615         struct async *as = urb->context;
 616         struct usb_dev_state *ps = as->ps;
 617         struct pid *pid = NULL;
 618         const struct cred *cred = NULL;
 619         unsigned long flags;
 620         sigval_t addr;
 621         int signr, errno;
 622
 623         spin_lock_irqsave(&ps->lock, flags);
 624         list_move_tail(&as->asynclist, &ps->async_completed);
 625         as->status = urb->status;
 626         signr = as->signr;
 627         if (signr) {
 628                 errno = as->status;
 629                 addr = as->userurb_sigval;
 630                 pid = get_pid(as->pid);
 631                 cred = get_cred(as->cred);
 632         }
 633         snoop(&urb->dev->dev, "urb complete\n");
 634         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 635                         as->status, COMPLETE, NULL, 0);
 636         if (usb_urb_dir_in(urb))
 637                 snoop_urb_data(urb, urb->actual_length);
 638
 639         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 640                         as->status != -ENOENT)
 641                 cancel_bulk_urbs(ps, as->bulk_addr);
 642
 643         wake_up(&ps->wait);
 644         spin_unlock_irqrestore(&ps->lock, flags);
 645
 646         if (signr) {
 647                 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
 648                 put_pid(pid);
 649                 put_cred(cred);
 650         }
 651 }
 652
 653 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 654 {
 655         struct urb *urb;
 656         struct async *as;
 657         unsigned long flags;
 658
 659         spin_lock_irqsave(&ps->lock, flags);
 660         while (!list_empty(list)) {
 661                 as = list_last_entry(list, struct async, asynclist);
 662                 list_del_init(&as->asynclist);
 663                 urb = as->urb;
 664                 usb_get_urb(urb);
 665
 666                 /* drop the spinlock so the completion handler can run */
 667                 spin_unlock_irqrestore(&ps->lock, flags);
 668                 usb_kill_urb(urb);
 669                 usb_put_urb(urb);
 670                 spin_lock_irqsave(&ps->lock, flags);
 671         }
 672         spin_unlock_irqrestore(&ps->lock, flags);
 673 }
 674
 675 static void destroy_async_on_interface(struct usb_dev_state *ps,
 676                                        unsigned int ifnum)
 677 {
 678         struct list_head *p, *q, hitlist;
 679         unsigned long flags;
 680
 681         INIT_LIST_HEAD(&hitlist);
 682         spin_lock_irqsave(&ps->lock, flags);
 683         list_for_each_safe(p, q, &ps->async_pending)
 684                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 685                         list_move_tail(p, &hitlist);
 686         spin_unlock_irqrestore(&ps->lock, flags);
 687         destroy_async(ps, &hitlist);
 688 }
 689
 690 static void destroy_all_async(struct usb_dev_state *ps)
 691 {
 692         destroy_async(ps, &ps->async_pending);
 693 }
 694
 695 /*
 696  * interface claims are made only at the request of user level code,
 697  * which can also release them (explicitly or by closing files).
 698  * they're also undone when devices disconnect.
 699  */
 700
 701 static int driver_probe(struct usb_interface *intf,
 702                         const struct usb_device_id *id)
 703 {
 704         return -ENODEV;
 705 }
 706
 707 static void driver_disconnect(struct usb_interface *intf)
 708 {
 709         struct usb_dev_state *ps = usb_get_intfdata(intf);
 710         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 711
 712         if (!ps)
 713                 return;
 714
 715         /* NOTE:  this relies on usbcore having canceled and completed
 716          * all pending I/O requests; 2.6 does that.
 717          */
 718
 719         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 720                 clear_bit(ifnum, &ps->ifclaimed);
 721         else
 722                 dev_warn(&intf->dev, "interface number %u out of range\n",
 723                          ifnum);
 724
 725         usb_set_intfdata(intf, NULL);
 726
 727         /* force async requests to complete */
 728         destroy_async_on_interface(ps, ifnum);
 729 }
 730
 731 /* We don't care about suspend/resume of claimed interfaces */
 732 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 733 {
 734         return 0;
 735 }
 736
 737 static int driver_resume(struct usb_interface *intf)
 738 {
 739         return 0;
 740 }
 741
 742 /* The following routines apply to the entire device, not interfaces */
 743 void usbfs_notify_suspend(struct usb_device *udev)
 744 {
 745         /* We don't need to handle this */
 746 }
 747
 748 void usbfs_notify_resume(struct usb_device *udev)
 749 {
 750         struct usb_dev_state *ps;
 751
 752         /* Protect against simultaneous remove or release */
 753         mutex_lock(&usbfs_mutex);
 754         list_for_each_entry(ps, &udev->filelist, list) {
 755                 WRITE_ONCE(ps->not_yet_resumed, 0);
 756                 wake_up_all(&ps->wait_for_resume);
 757         }
 758         mutex_unlock(&usbfs_mutex);
 759 }
 760
 761 struct usb_driver usbfs_driver = {
 762         .name =         "usbfs",
 763         .probe =        driver_probe,
 764         .disconnect =   driver_disconnect,
 765         .suspend =      driver_suspend,
 766         .resume =       driver_resume,
 767         .supports_autosuspend = 1,
 768 };
 769
 770 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 771 {
 772         struct usb_device *dev = ps->dev;
 773         struct usb_interface *intf;
 774         int err;
 775
 776         if (ifnum >= 8*sizeof(ps->ifclaimed))
 777                 return -EINVAL;
 778         /* already claimed */
 779         if (test_bit(ifnum, &ps->ifclaimed))
 780                 return 0;
 781
 782         if (ps->privileges_dropped &&
 783                         !test_bit(ifnum, &ps->interface_allowed_mask))
 784                 return -EACCES;
 785
 786         intf = usb_ifnum_to_if(dev, ifnum);
 787         if (!intf)
 788                 err = -ENOENT;
 789         else {
 790                 unsigned int old_suppress;
 791
 792                 /* suppress uevents while claiming interface */
 793                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 794                 dev_set_uevent_suppress(&intf->dev, 1);
 795                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 796                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 797         }
 798         if (err == 0)
 799                 set_bit(ifnum, &ps->ifclaimed);
 800         return err;
 801 }
 802
 803 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 804 {
 805         struct usb_device *dev;
 806         struct usb_interface *intf;
 807         int err;
 808
 809         err = -EINVAL;
 810         if (ifnum >= 8*sizeof(ps->ifclaimed))
 811                 return err;
 812         dev = ps->dev;
 813         intf = usb_ifnum_to_if(dev, ifnum);
 814         if (!intf)
 815                 err = -ENOENT;
 816         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 817                 unsigned int old_suppress;
 818
 819                 /* suppress uevents while releasing interface */
 820                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 821                 dev_set_uevent_suppress(&intf->dev, 1);
 822                 usb_driver_release_interface(&usbfs_driver, intf);
 823                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 824                 err = 0;
 825         }
 826         return err;
 827 }
 828
 829 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 830 {
 831         if (ps->dev->state != USB_STATE_CONFIGURED)
 832                 return -EHOSTUNREACH;
 833         if (ifnum >= 8*sizeof(ps->ifclaimed))
 834                 return -EINVAL;
 835         if (test_bit(ifnum, &ps->ifclaimed))
 836                 return 0;
 837         /* if not yet claimed, claim it for the driver */
 838         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 839                  "interface %u before use\n", task_pid_nr(current),
 840                  current->comm, ifnum);
 841         return claimintf(ps, ifnum);
 842 }
 843
 844 static int findintfep(struct usb_device *dev, unsigned int ep)
 845 {
 846         unsigned int i, j, e;
 847         struct usb_interface *intf;
 848         struct usb_host_interface *alts;
 849         struct usb_endpoint_descriptor *endpt;
 850
 851         if (ep & ~(USB_DIR_IN|0xf))
 852                 return -EINVAL;
 853         if (!dev->actconfig)
 854                 return -ESRCH;
 855         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 856                 intf = dev->actconfig->interface[i];
 857                 for (j = 0; j < intf->num_altsetting; j++) {
 858                         alts = &intf->altsetting[j];
 859                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 860                                 endpt = &alts->endpoint[e].desc;
 861                                 if (endpt->bEndpointAddress == ep)
 862                                         return alts->desc.bInterfaceNumber;
 863                         }
 864                 }
 865         }
 866         return -ENOENT;
 867 }
 868
 869 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 870                            unsigned int request, unsigned int index)
 871 {
 872         int ret = 0;
 873         struct usb_host_interface *alt_setting;
 874
 875         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 876          && ps->dev->state != USB_STATE_ADDRESS
 877          && ps->dev->state != USB_STATE_CONFIGURED)
 878                 return -EHOSTUNREACH;
 879         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 880                 return 0;
 881
 882         /*
 883          * check for the special corner case 'get_device_id' in the printer
 884          * class specification, which we always want to allow as it is used
 885          * to query things like ink level, etc.
 886          */
 887         if (requesttype == 0xa1 && request == 0) {
 888                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 889                                                    index >> 8, index & 0xff);
 890                 if (alt_setting
 891                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 892                         return 0;
 893         }
 894
 895         index &= 0xff;
 896         switch (requesttype & USB_RECIP_MASK) {
 897         case USB_RECIP_ENDPOINT:
 898                 if ((index & ~USB_DIR_IN) == 0)
 899                         return 0;
 900                 ret = findintfep(ps->dev, index);
 901                 if (ret < 0) {
 902                         /*
 903                          * Some not fully compliant Win apps seem to get
 904                          * index wrong and have the endpoint number here
 905                          * rather than the endpoint address (with the
 906                          * correct direction). Win does let this through,
 907                          * so we'll not reject it here but leave it to
 908                          * the device to not break KVM. But we warn.
 909                          */
 910                         ret = findintfep(ps->dev, index ^ 0x80);
 911                         if (ret >= 0)
 912                                 dev_info(&ps->dev->dev,
 913                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 914                                         __func__, task_pid_nr(current),
 915                                         current->comm, index, index ^ 0x80);
 916                 }
 917                 if (ret >= 0)
 918                         ret = checkintf(ps, ret);
 919                 break;
 920
 921         case USB_RECIP_INTERFACE:
 922                 ret = checkintf(ps, index);
 923                 break;
 924         }
 925         return ret;
 926 }
 927
 928 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 929                                                      unsigned char ep)
 930 {
 931         if (ep & USB_ENDPOINT_DIR_MASK)
 932                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 933         else
 934                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 935 }
 936
 937 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 938                                   struct usbdevfs_streams __user *streams,
 939                                   unsigned int *num_streams_ret,
 940                                   unsigned int *num_eps_ret,
 941                                   struct usb_host_endpoint ***eps_ret,
 942                                   struct usb_interface **intf_ret)
 943 {
 944         unsigned int i, num_streams, num_eps;
 945         struct usb_host_endpoint **eps;
 946         struct usb_interface *intf = NULL;
 947         unsigned char ep;
 948         int ifnum, ret;
 949
 950         if (get_user(num_streams, &streams->num_streams) ||
 951             get_user(num_eps, &streams->num_eps))
 952                 return -EFAULT;
 953
 954         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 955                 return -EINVAL;
 956
 957         /* The XHCI controller allows max 2 ^ 16 streams */
 958         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 959                 return -EINVAL;
 960
 961         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 962         if (!eps)
 963                 return -ENOMEM;
 964
 965         for (i = 0; i < num_eps; i++) {
 966                 if (get_user(ep, &streams->eps[i])) {
 967                         ret = -EFAULT;
 968                         goto error;
 969                 }
 970                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 971                 if (!eps[i]) {
 972                         ret = -EINVAL;
 973                         goto error;
 974                 }
 975
 976                 /* usb_alloc/free_streams operate on an usb_interface */
 977                 ifnum = findintfep(ps->dev, ep);
 978                 if (ifnum < 0) {
 979                         ret = ifnum;
 980                         goto error;
 981                 }
 982
 983                 if (i == 0) {
 984                         ret = checkintf(ps, ifnum);
 985                         if (ret < 0)
 986                                 goto error;
 987                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 988                 } else {
 989                         /* Verify all eps belong to the same interface */
 990                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 991                                 ret = -EINVAL;
 992                                 goto error;
 993                         }
 994                 }
 995         }
 996
 997         if (num_streams_ret)
 998                 *num_streams_ret = num_streams;
 999         *num_eps_ret = num_eps;
1000         *eps_ret = eps;
1001         *intf_ret = intf;
1002
1003         return 0;
1004
1005 error:
1006         kfree(eps);
1007         return ret;
1008 }
1009
1010 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1011 {
1012         struct device *dev;
1013
1014         dev = bus_find_device_by_devt(&usb_bus_type, devt);
1015         if (!dev)
1016                 return NULL;
1017         return to_usb_device(dev);
1018 }
1019
1020 /*
1021  * file operations
1022  */
1023 static int usbdev_open(struct inode *inode, struct file *file)
1024 {
1025         struct usb_device *dev = NULL;
1026         struct usb_dev_state *ps;
1027         int ret;
1028
1029         ret = -ENOMEM;
1030         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1031         if (!ps)
1032                 goto out_free_ps;
1033
1034         ret = -ENODEV;
1035
1036         /* usbdev device-node */
1037         if (imajor(inode) == USB_DEVICE_MAJOR)
1038                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1039         if (!dev)
1040                 goto out_free_ps;
1041
1042         usb_lock_device(dev);
1043         if (dev->state == USB_STATE_NOTATTACHED)
1044                 goto out_unlock_device;
1045
1046         ret = usb_autoresume_device(dev);
1047         if (ret)
1048                 goto out_unlock_device;
1049
1050         ps->dev = dev;
1051         ps->file = file;
1052         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1053         spin_lock_init(&ps->lock);
1054         INIT_LIST_HEAD(&ps->list);
1055         INIT_LIST_HEAD(&ps->async_pending);
1056         INIT_LIST_HEAD(&ps->async_completed);
1057         INIT_LIST_HEAD(&ps->memory_list);
1058         init_waitqueue_head(&ps->wait);
1059         init_waitqueue_head(&ps->wait_for_resume);
1060         ps->disc_pid = get_pid(task_pid(current));
1061         ps->cred = get_current_cred();
1062         smp_wmb();
1063
1064         /* Can't race with resume; the device is already active */
1065         list_add_tail(&ps->list, &dev->filelist);
1066         file->private_data = ps;
1067         usb_unlock_device(dev);
1068         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1069                         current->comm);
1070         return ret;
1071
1072  out_unlock_device:
1073         usb_unlock_device(dev);
1074         usb_put_dev(dev);
1075  out_free_ps:
1076         kfree(ps);
1077         return ret;
1078 }
1079
1080 static int usbdev_release(struct inode *inode, struct file *file)
1081 {
1082         struct usb_dev_state *ps = file->private_data;
1083         struct usb_device *dev = ps->dev;
1084         unsigned int ifnum;
1085         struct async *as;
1086
1087         usb_lock_device(dev);
1088         usb_hub_release_all_ports(dev, ps);
1089
1090         /* Protect against simultaneous resume */
1091         mutex_lock(&usbfs_mutex);
1092         list_del_init(&ps->list);
1093         mutex_unlock(&usbfs_mutex);
1094
1095         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1096                         ifnum++) {
1097                 if (test_bit(ifnum, &ps->ifclaimed))
1098                         releaseintf(ps, ifnum);
1099         }
1100         destroy_all_async(ps);
1101         if (!ps->suspend_allowed)
1102                 usb_autosuspend_device(dev);
1103         usb_unlock_device(dev);
1104         usb_put_dev(dev);
1105         put_pid(ps->disc_pid);
1106         put_cred(ps->cred);
1107
1108         as = async_getcompleted(ps);
1109         while (as) {
1110                 free_async(as);
1111                 as = async_getcompleted(ps);
1112         }
1113
1114         kfree(ps);
1115         return 0;
1116 }
1117
1118 static void usbfs_blocking_completion(struct urb *urb)
1119 {
1120         complete((struct completion *) urb->context);
1121 }
1122
1123 /*
1124  * Much like usb_start_wait_urb, but returns status separately from
1125  * actual_length and uses a killable wait.
1126  */
1127 static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1128                 unsigned int *actlen)
1129 {
1130         DECLARE_COMPLETION_ONSTACK(ctx);
1131         unsigned long expire;
1132         int rc;
1133
1134         urb->context = &ctx;
1135         urb->complete = usbfs_blocking_completion;
1136         *actlen = 0;
1137         rc = usb_submit_urb(urb, GFP_KERNEL);
1138         if (unlikely(rc))
1139                 return rc;
1140
1141         expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
1142         rc = wait_for_completion_killable_timeout(&ctx, expire);
1143         if (rc <= 0) {
1144                 usb_kill_urb(urb);
1145                 *actlen = urb->actual_length;
1146                 if (urb->status != -ENOENT)
1147                         ;       /* Completed before it was killed */
1148                 else if (rc < 0)
1149                         return -EINTR;
1150                 else
1151                         return -ETIMEDOUT;
1152         }
1153         *actlen = urb->actual_length;
1154         return urb->status;
1155 }
1156
1157 static int do_proc_control(struct usb_dev_state *ps,
1158                 struct usbdevfs_ctrltransfer *ctrl)
1159 {
1160         struct usb_device *dev = ps->dev;
1161         unsigned int tmo;
1162         unsigned char *tbuf;
1163         unsigned int wLength, actlen;
1164         int i, pipe, ret;
1165         struct urb *urb = NULL;
1166         struct usb_ctrlrequest *dr = NULL;
1167
1168         ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1169                               ctrl->wIndex);
1170         if (ret)
1171                 return ret;
1172         wLength = ctrl->wLength;        /* To suppress 64k PAGE_SIZE warning */
1173         if (wLength > PAGE_SIZE)
1174                 return -EINVAL;
1175         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1176                         sizeof(struct usb_ctrlrequest));
1177         if (ret)
1178                 return ret;
1179
1180         ret = -ENOMEM;
1181         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1182         if (!tbuf)
1183                 goto done;
1184         urb = usb_alloc_urb(0, GFP_NOIO);
1185         if (!urb)
1186                 goto done;
1187         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
1188         if (!dr)
1189                 goto done;
1190
1191         dr->bRequestType = ctrl->bRequestType;
1192         dr->bRequest = ctrl->bRequest;
1193         dr->wValue = cpu_to_le16(ctrl->wValue);
1194         dr->wIndex = cpu_to_le16(ctrl->wIndex);
1195         dr->wLength = cpu_to_le16(ctrl->wLength);
1196
1197         tmo = ctrl->timeout;
1198         snoop(&dev->dev, "control urb: bRequestType=%02x "
1199                 "bRequest=%02x wValue=%04x "
1200                 "wIndex=%04x wLength=%04x\n",
1201                 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1202                 ctrl->wIndex, ctrl->wLength);
1203
1204         if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1205                 pipe = usb_rcvctrlpipe(dev, 0);
1206                 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1207                                 wLength, NULL, NULL);
1208                 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
1209
1210                 usb_unlock_device(dev);
1211                 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1212                 usb_lock_device(dev);
1213                 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
1214                 if (!i && actlen) {
1215                         if (copy_to_user(ctrl->data, tbuf, actlen)) {
1216                                 ret = -EFAULT;
1217                                 goto recv_fault;
1218                         }
1219                 }
1220         } else {
1221                 if (wLength) {
1222                         if (copy_from_user(tbuf, ctrl->data, wLength)) {
1223                                 ret = -EFAULT;
1224                                 goto done;
1225                         }
1226                 }
1227                 pipe = usb_sndctrlpipe(dev, 0);
1228                 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1229                                 wLength, NULL, NULL);
1230                 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
1231
1232                 usb_unlock_device(dev);
1233                 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1234                 usb_lock_device(dev);
1235                 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
1236         }
1237         if (i < 0 && i != -EPIPE) {
1238                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1239                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1240                            current->comm, ctrl->bRequestType, ctrl->bRequest,
1241                            ctrl->wLength, i);
1242         }
1243         ret = (i < 0 ? i : actlen);
1244
1245  recv_fault:
1246         /* Linger a bit, prior to the next control message. */
1247         if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1248                 msleep(200);
1249  done:
1250         kfree(dr);
1251         usb_free_urb(urb);
1252         free_page((unsigned long) tbuf);
1253         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1254                         sizeof(struct usb_ctrlrequest));
1255         return ret;
1256 }
1257
1258 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1259 {
1260         struct usbdevfs_ctrltransfer ctrl;
1261
1262         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1263                 return -EFAULT;
1264         return do_proc_control(ps, &ctrl);
1265 }
1266
1267 static int do_proc_bulk(struct usb_dev_state *ps,
1268                 struct usbdevfs_bulktransfer *bulk)
1269 {
1270         struct usb_device *dev = ps->dev;
1271         unsigned int tmo, len1, len2, pipe;
1272         unsigned char *tbuf;
1273         int i, ret;
1274         struct urb *urb = NULL;
1275         struct usb_host_endpoint *ep;
1276
1277         ret = findintfep(ps->dev, bulk->ep);
1278         if (ret < 0)
1279                 return ret;
1280         ret = checkintf(ps, ret);
1281         if (ret)
1282                 return ret;
1283
1284         len1 = bulk->len;
1285         if (len1 < 0 || len1 >= (INT_MAX - sizeof(struct urb)))
1286                 return -EINVAL;
1287
1288         if (bulk->ep & USB_DIR_IN)
1289                 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1290         else
1291                 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1292         ep = usb_pipe_endpoint(dev, pipe);
1293         if (!ep || !usb_endpoint_maxp(&ep->desc))
1294                 return -EINVAL;
1295         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1296         if (ret)
1297                 return ret;
1298
1299         /*
1300          * len1 can be almost arbitrarily large.  Don't WARN if it's
1301          * too big, just fail the request.
1302          */
1303         ret = -ENOMEM;
1304         tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1305         if (!tbuf)
1306                 goto done;
1307         urb = usb_alloc_urb(0, GFP_KERNEL);
1308         if (!urb)
1309                 goto done;
1310
1311         if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1312                         USB_ENDPOINT_XFER_INT) {
1313                 pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
1314                 usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
1315                                 NULL, NULL, ep->desc.bInterval);
1316         } else {
1317                 usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
1318         }
1319
1320         tmo = bulk->timeout;
1321         if (bulk->ep & 0x80) {
1322                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1323
1324                 usb_unlock_device(dev);
1325                 i = usbfs_start_wait_urb(urb, tmo, &len2);
1326                 usb_lock_device(dev);
1327                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1328
1329                 if (!i && len2) {
1330                         if (copy_to_user(bulk->data, tbuf, len2)) {
1331                                 ret = -EFAULT;
1332                                 goto done;
1333                         }
1334                 }
1335         } else {
1336                 if (len1) {
1337                         if (copy_from_user(tbuf, bulk->data, len1)) {
1338                                 ret = -EFAULT;
1339                                 goto done;
1340                         }
1341                 }
1342                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1343
1344                 usb_unlock_device(dev);
1345                 i = usbfs_start_wait_urb(urb, tmo, &len2);
1346                 usb_lock_device(dev);
1347                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1348         }
1349         ret = (i < 0 ? i : len2);
1350  done:
1351         usb_free_urb(urb);
1352         kfree(tbuf);
1353         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1354         return ret;
1355 }
1356
1357 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1358 {
1359         struct usbdevfs_bulktransfer bulk;
1360
1361         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1362                 return -EFAULT;
1363         return do_proc_bulk(ps, &bulk);
1364 }
1365
1366 static void check_reset_of_active_ep(struct usb_device *udev,
1367                 unsigned int epnum, char *ioctl_name)
1368 {
1369         struct usb_host_endpoint **eps;
1370         struct usb_host_endpoint *ep;
1371
1372         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1373         ep = eps[epnum & 0x0f];
1374         if (ep && !list_empty(&ep->urb_list))
1375                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1376                                 task_pid_nr(current), current->comm,
1377                                 ioctl_name, epnum);
1378 }
1379
1380 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1381 {
1382         unsigned int ep;
1383         int ret;
1384
1385         if (get_user(ep, (unsigned int __user *)arg))
1386                 return -EFAULT;
1387         ret = findintfep(ps->dev, ep);
1388         if (ret < 0)
1389                 return ret;
1390         ret = checkintf(ps, ret);
1391         if (ret)
1392                 return ret;
1393         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1394         usb_reset_endpoint(ps->dev, ep);
1395         return 0;
1396 }
1397
1398 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1399 {
1400         unsigned int ep;
1401         int pipe;
1402         int ret;
1403
1404         if (get_user(ep, (unsigned int __user *)arg))
1405                 return -EFAULT;
1406         ret = findintfep(ps->dev, ep);
1407         if (ret < 0)
1408                 return ret;
1409         ret = checkintf(ps, ret);
1410         if (ret)
1411                 return ret;
1412         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1413         if (ep & USB_DIR_IN)
1414                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1415         else
1416                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1417
1418         return usb_clear_halt(ps->dev, pipe);
1419 }
1420
1421 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1422 {
1423         struct usbdevfs_getdriver gd;
1424         struct usb_interface *intf;
1425         int ret;
1426
1427         if (copy_from_user(&gd, arg, sizeof(gd)))
1428                 return -EFAULT;
1429         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1430         if (!intf || !intf->dev.driver)
1431                 ret = -ENODATA;
1432         else {
1433                 strlcpy(gd.driver, intf->dev.driver->name,
1434                                 sizeof(gd.driver));
1435                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1436         }
1437         return ret;
1438 }
1439
1440 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1441 {
1442         struct usbdevfs_connectinfo ci;
1443
1444         memset(&ci, 0, sizeof(ci));
1445         ci.devnum = ps->dev->devnum;
1446         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1447
1448         if (copy_to_user(arg, &ci, sizeof(ci)))
1449                 return -EFAULT;
1450         return 0;
1451 }
1452
1453 static int proc_conninfo_ex(struct usb_dev_state *ps,
1454                             void __user *arg, size_t size)
1455 {
1456         struct usbdevfs_conninfo_ex ci;
1457         struct usb_device *udev = ps->dev;
1458
1459         if (size < sizeof(ci.size))
1460                 return -EINVAL;
1461
1462         memset(&ci, 0, sizeof(ci));
1463         ci.size = sizeof(ci);
1464         ci.busnum = udev->bus->busnum;
1465         ci.devnum = udev->devnum;
1466         ci.speed = udev->speed;
1467
1468         while (udev && udev->portnum != 0) {
1469                 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1470                         ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1471                                         udev->portnum;
1472                 udev = udev->parent;
1473         }
1474
1475         if (ci.num_ports < ARRAY_SIZE(ci.ports))
1476                 memmove(&ci.ports[0],
1477                         &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1478                         ci.num_ports);
1479
1480         if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1481                 return -EFAULT;
1482
1483         return 0;
1484 }
1485
1486 static int proc_resetdevice(struct usb_dev_state *ps)
1487 {
1488         struct usb_host_config *actconfig = ps->dev->actconfig;
1489         struct usb_interface *interface;
1490         int i, number;
1491
1492         /* Don't allow a device reset if the process has dropped the
1493          * privilege to do such things and any of the interfaces are
1494          * currently claimed.
1495          */
1496         if (ps->privileges_dropped && actconfig) {
1497                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1498                         interface = actconfig->interface[i];
1499                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1500                         if (usb_interface_claimed(interface) &&
1501                                         !test_bit(number, &ps->ifclaimed)) {
1502                                 dev_warn(&ps->dev->dev,
1503                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1504                                         number, interface->dev.driver->name, current->comm);
1505                                 return -EACCES;
1506                         }
1507                 }
1508         }
1509
1510         return usb_reset_device(ps->dev);
1511 }
1512
1513 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1514 {
1515         struct usbdevfs_setinterface setintf;
1516         int ret;
1517
1518         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1519                 return -EFAULT;
1520         ret = checkintf(ps, setintf.interface);
1521         if (ret)
1522                 return ret;
1523
1524         destroy_async_on_interface(ps, setintf.interface);
1525
1526         return usb_set_interface(ps->dev, setintf.interface,
1527                         setintf.altsetting);
1528 }
1529
1530 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1531 {
1532         int u;
1533         int status = 0;
1534         struct usb_host_config *actconfig;
1535
1536         if (get_user(u, (int __user *)arg))
1537                 return -EFAULT;
1538
1539         actconfig = ps->dev->actconfig;
1540
1541         /* Don't touch the device if any interfaces are claimed.
1542          * It could interfere with other drivers' operations, and if
1543          * an interface is claimed by usbfs it could easily deadlock.
1544          */
1545         if (actconfig) {
1546                 int i;
1547
1548                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1549                         if (usb_interface_claimed(actconfig->interface[i])) {
1550                                 dev_warn(&ps->dev->dev,
1551                                         "usbfs: interface %d claimed by %s "
1552                                         "while '%s' sets config #%d\n",
1553                                         actconfig->interface[i]
1554                                                 ->cur_altsetting
1555                                                 ->desc.bInterfaceNumber,
1556                                         actconfig->interface[i]
1557                                                 ->dev.driver->name,
1558                                         current->comm, u);
1559                                 status = -EBUSY;
1560                                 break;
1561                         }
1562                 }
1563         }
1564
1565         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1566          * so avoid usb_set_configuration()'s kick to sysfs
1567          */
1568         if (status == 0) {
1569                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1570                         status = usb_reset_configuration(ps->dev);
1571                 else
1572                         status = usb_set_configuration(ps->dev, u);
1573         }
1574
1575         return status;
1576 }
1577
1578 static struct usb_memory *
1579 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1580 {
1581         struct usb_memory *usbm = NULL, *iter;
1582         unsigned long flags;
1583         unsigned long uurb_start = (unsigned long)uurb->buffer;
1584
1585         spin_lock_irqsave(&ps->lock, flags);
1586         list_for_each_entry(iter, &ps->memory_list, memlist) {
1587                 if (uurb_start >= iter->vm_start &&
1588                                 uurb_start < iter->vm_start + iter->size) {
1589                         if (uurb->buffer_length > iter->vm_start + iter->size -
1590                                         uurb_start) {
1591                                 usbm = ERR_PTR(-EINVAL);
1592                         } else {
1593                                 usbm = iter;
1594                                 usbm->urb_use_count++;
1595                         }
1596                         break;
1597                 }
1598         }
1599         spin_unlock_irqrestore(&ps->lock, flags);
1600         return usbm;
1601 }
1602
1603 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1604                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1605                         void __user *arg, sigval_t userurb_sigval)
1606 {
1607         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1608         struct usb_host_endpoint *ep;
1609         struct async *as = NULL;
1610         struct usb_ctrlrequest *dr = NULL;
1611         unsigned int u, totlen, isofrmlen;
1612         int i, ret, num_sgs = 0, ifnum = -1;
1613         int number_of_packets = 0;
1614         unsigned int stream_id = 0;
1615         void *buf;
1616         bool is_in;
1617         bool allow_short = false;
1618         bool allow_zero = false;
1619         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1620                                 USBDEVFS_URB_BULK_CONTINUATION |
1621                                 USBDEVFS_URB_NO_FSBR |
1622                                 USBDEVFS_URB_ZERO_PACKET |
1623                                 USBDEVFS_URB_NO_INTERRUPT;
1624         /* USBDEVFS_URB_ISO_ASAP is a special case */
1625         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1626                 mask |= USBDEVFS_URB_ISO_ASAP;
1627
1628         if (uurb->flags & ~mask)
1629                         return -EINVAL;
1630
1631         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1632                 return -EINVAL;
1633         if (uurb->buffer_length > 0 && !uurb->buffer)
1634                 return -EINVAL;
1635         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1636             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1637                 ifnum = findintfep(ps->dev, uurb->endpoint);
1638                 if (ifnum < 0)
1639                         return ifnum;
1640                 ret = checkintf(ps, ifnum);
1641                 if (ret)
1642                         return ret;
1643         }
1644         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1645         if (!ep)
1646                 return -ENOENT;
1647         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1648
1649         u = 0;
1650         switch (uurb->type) {
1651         case USBDEVFS_URB_TYPE_CONTROL:
1652                 if (!usb_endpoint_xfer_control(&ep->desc))
1653                         return -EINVAL;
1654                 /* min 8 byte setup packet */
1655                 if (uurb->buffer_length < 8)
1656                         return -EINVAL;
1657                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1658                 if (!dr)
1659                         return -ENOMEM;
1660                 if (copy_from_user(dr, uurb->buffer, 8)) {
1661                         ret = -EFAULT;
1662                         goto error;
1663                 }
1664                 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1665                         ret = -EINVAL;
1666                         goto error;
1667                 }
1668                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1669                                       le16_to_cpu(dr->wIndex));
1670                 if (ret)
1671                         goto error;
1672                 uurb->buffer_length = le16_to_cpu(dr->wLength);
1673                 uurb->buffer += 8;
1674                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1675                         is_in = true;
1676                         uurb->endpoint |= USB_DIR_IN;
1677                 } else {
1678                         is_in = false;
1679                         uurb->endpoint &= ~USB_DIR_IN;
1680                 }
1681                 if (is_in)
1682                         allow_short = true;
1683                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1684                         "bRequest=%02x wValue=%04x "
1685                         "wIndex=%04x wLength=%04x\n",
1686                         dr->bRequestType, dr->bRequest,
1687                         __le16_to_cpu(dr->wValue),
1688                         __le16_to_cpu(dr->wIndex),
1689                         __le16_to_cpu(dr->wLength));
1690                 u = sizeof(struct usb_ctrlrequest);
1691                 break;
1692
1693         case USBDEVFS_URB_TYPE_BULK:
1694                 if (!is_in)
1695                         allow_zero = true;
1696                 else
1697                         allow_short = true;
1698                 switch (usb_endpoint_type(&ep->desc)) {
1699                 case USB_ENDPOINT_XFER_CONTROL:
1700                 case USB_ENDPOINT_XFER_ISOC:
1701                         return -EINVAL;
1702                 case USB_ENDPOINT_XFER_INT:
1703                         /* allow single-shot interrupt transfers */
1704                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1705                         goto interrupt_urb;
1706                 }
1707                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1708                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1709                         num_sgs = 0;
1710                 if (ep->streams)
1711                         stream_id = uurb->stream_id;
1712                 break;
1713
1714         case USBDEVFS_URB_TYPE_INTERRUPT:
1715                 if (!usb_endpoint_xfer_int(&ep->desc))
1716                         return -EINVAL;
1717  interrupt_urb:
1718                 if (!is_in)
1719                         allow_zero = true;
1720                 else
1721                         allow_short = true;
1722                 break;
1723
1724         case USBDEVFS_URB_TYPE_ISO:
1725                 /* arbitrary limit */
1726                 if (uurb->number_of_packets < 1 ||
1727                     uurb->number_of_packets > 128)
1728                         return -EINVAL;
1729                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1730                         return -EINVAL;
1731                 number_of_packets = uurb->number_of_packets;
1732                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1733                                    number_of_packets;
1734                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1735                 if (IS_ERR(isopkt)) {
1736                         ret = PTR_ERR(isopkt);
1737                         isopkt = NULL;
1738                         goto error;
1739                 }
1740                 for (totlen = u = 0; u < number_of_packets; u++) {
1741                         /*
1742                          * arbitrary limit need for USB 3.1 Gen2
1743                          * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1744                          */
1745                         if (isopkt[u].length > 98304) {
1746                                 ret = -EINVAL;
1747                                 goto error;
1748                         }
1749                         totlen += isopkt[u].length;
1750                 }
1751                 u *= sizeof(struct usb_iso_packet_descriptor);
1752                 uurb->buffer_length = totlen;
1753                 break;
1754
1755         default:
1756                 return -EINVAL;
1757         }
1758
1759         if (uurb->buffer_length > 0 &&
1760                         !access_ok(uurb->buffer, uurb->buffer_length)) {
1761                 ret = -EFAULT;
1762                 goto error;
1763         }
1764         as = alloc_async(number_of_packets);
1765         if (!as) {
1766                 ret = -ENOMEM;
1767                 goto error;
1768         }
1769
1770         as->usbm = find_memory_area(ps, uurb);
1771         if (IS_ERR(as->usbm)) {
1772                 ret = PTR_ERR(as->usbm);
1773                 as->usbm = NULL;
1774                 goto error;
1775         }
1776
1777         /* do not use SG buffers when memory mapped segments
1778          * are in use
1779          */
1780         if (as->usbm)
1781                 num_sgs = 0;
1782
1783         u += sizeof(struct async) + sizeof(struct urb) +
1784              (as->usbm ? 0 : uurb->buffer_length) +
1785              num_sgs * sizeof(struct scatterlist);
1786         ret = usbfs_increase_memory_usage(u);
1787         if (ret)
1788                 goto error;
1789         as->mem_usage = u;
1790
1791         if (num_sgs) {
1792                 as->urb->sg = kmalloc_array(num_sgs,
1793                                             sizeof(struct scatterlist),
1794                                             GFP_KERNEL | __GFP_NOWARN);
1795                 if (!as->urb->sg) {
1796                         ret = -ENOMEM;
1797                         goto error;
1798                 }
1799                 as->urb->num_sgs = num_sgs;
1800                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1801
1802                 totlen = uurb->buffer_length;
1803                 for (i = 0; i < as->urb->num_sgs; i++) {
1804                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1805                         buf = kmalloc(u, GFP_KERNEL);
1806                         if (!buf) {
1807                                 ret = -ENOMEM;
1808                                 goto error;
1809                         }
1810                         sg_set_buf(&as->urb->sg[i], buf, u);
1811
1812                         if (!is_in) {
1813                                 if (copy_from_user(buf, uurb->buffer, u)) {
1814                                         ret = -EFAULT;
1815                                         goto error;
1816                                 }
1817                                 uurb->buffer += u;
1818                         }
1819                         totlen -= u;
1820                 }
1821         } else if (uurb->buffer_length > 0) {
1822                 if (as->usbm) {
1823                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1824
1825                         as->urb->transfer_buffer = as->usbm->mem +
1826                                         (uurb_start - as->usbm->vm_start);
1827                 } else {
1828                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1829                                         GFP_KERNEL | __GFP_NOWARN);
1830                         if (!as->urb->transfer_buffer) {
1831                                 ret = -ENOMEM;
1832                                 goto error;
1833                         }
1834                         if (!is_in) {
1835                                 if (copy_from_user(as->urb->transfer_buffer,
1836                                                    uurb->buffer,
1837                                                    uurb->buffer_length)) {
1838                                         ret = -EFAULT;
1839                                         goto error;
1840                                 }
1841                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1842                                 /*
1843                                  * Isochronous input data may end up being
1844                                  * discontiguous if some of the packets are
1845                                  * short. Clear the buffer so that the gaps
1846                                  * don't leak kernel data to userspace.
1847                                  */
1848                                 memset(as->urb->transfer_buffer, 0,
1849                                                 uurb->buffer_length);
1850                         }
1851                 }
1852         }
1853         as->urb->dev = ps->dev;
1854         as->urb->pipe = (uurb->type << 30) |
1855                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1856                         (uurb->endpoint & USB_DIR_IN);
1857
1858         /* This tedious sequence is necessary because the URB_* flags
1859          * are internal to the kernel and subject to change, whereas
1860          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1861          */
1862         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1863         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1864                 u |= URB_ISO_ASAP;
1865         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1866                 u |= URB_SHORT_NOT_OK;
1867         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1868                 u |= URB_ZERO_PACKET;
1869         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1870                 u |= URB_NO_INTERRUPT;
1871         as->urb->transfer_flags = u;
1872
1873         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1874                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1875         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1876                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1877
1878         as->urb->transfer_buffer_length = uurb->buffer_length;
1879         as->urb->setup_packet = (unsigned char *)dr;
1880         dr = NULL;
1881         as->urb->start_frame = uurb->start_frame;
1882         as->urb->number_of_packets = number_of_packets;
1883         as->urb->stream_id = stream_id;
1884
1885         if (ep->desc.bInterval) {
1886                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1887                                 ps->dev->speed == USB_SPEED_HIGH ||
1888                                 ps->dev->speed >= USB_SPEED_SUPER)
1889                         as->urb->interval = 1 <<
1890                                         min(15, ep->desc.bInterval - 1);
1891                 else
1892                         as->urb->interval = ep->desc.bInterval;
1893         }
1894
1895         as->urb->context = as;
1896         as->urb->complete = async_completed;
1897         for (totlen = u = 0; u < number_of_packets; u++) {
1898                 as->urb->iso_frame_desc[u].offset = totlen;
1899                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1900                 totlen += isopkt[u].length;
1901         }
1902         kfree(isopkt);
1903         isopkt = NULL;
1904         as->ps = ps;
1905         as->userurb = arg;
1906         as->userurb_sigval = userurb_sigval;
1907         if (as->usbm) {
1908                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1909
1910                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1911                 as->urb->transfer_dma = as->usbm->dma_handle +
1912                                 (uurb_start - as->usbm->vm_start);
1913         } else if (is_in && uurb->buffer_length > 0)
1914                 as->userbuffer = uurb->buffer;
1915         as->signr = uurb->signr;
1916         as->ifnum = ifnum;
1917         as->pid = get_pid(task_pid(current));
1918         as->cred = get_current_cred();
1919         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1920                         as->urb->transfer_buffer_length, 0, SUBMIT,
1921                         NULL, 0);
1922         if (!is_in)
1923                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1924
1925         async_newpending(as);
1926
1927         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1928                 spin_lock_irq(&ps->lock);
1929
1930                 /* Not exactly the endpoint address; the direction bit is
1931                  * shifted to the 0x10 position so that the value will be
1932                  * between 0 and 31.
1933                  */
1934                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1935                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1936                                 >> 3);
1937
1938                 /* If this bulk URB is the start of a new transfer, re-enable
1939                  * the endpoint.  Otherwise mark it as a continuation URB.
1940                  */
1941                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1942                         as->bulk_status = AS_CONTINUATION;
1943                 else
1944                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1945
1946                 /* Don't accept continuation URBs if the endpoint is
1947                  * disabled because of an earlier error.
1948                  */
1949                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1950                         ret = -EREMOTEIO;
1951                 else
1952                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1953                 spin_unlock_irq(&ps->lock);
1954         } else {
1955                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1956         }
1957
1958         if (ret) {
1959                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1960                            "usbfs: usb_submit_urb returned %d\n", ret);
1961                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1962                                 0, ret, COMPLETE, NULL, 0);
1963                 async_removepending(as);
1964                 goto error;
1965         }
1966         return 0;
1967
1968  error:
1969         kfree(isopkt);
1970         kfree(dr);
1971         if (as)
1972                 free_async(as);
1973         return ret;
1974 }
1975
1976 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1977 {
1978         struct usbdevfs_urb uurb;
1979         sigval_t userurb_sigval;
1980
1981         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1982                 return -EFAULT;
1983
1984         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1985         userurb_sigval.sival_ptr = arg;
1986
1987         return proc_do_submiturb(ps, &uurb,
1988                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1989                         arg, userurb_sigval);
1990 }
1991
1992 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1993 {
1994         struct urb *urb;
1995         struct async *as;
1996         unsigned long flags;
1997
1998         spin_lock_irqsave(&ps->lock, flags);
1999         as = async_getpending(ps, arg);
2000         if (!as) {
2001                 spin_unlock_irqrestore(&ps->lock, flags);
2002                 return -EINVAL;
2003         }
2004
2005         urb = as->urb;
2006         usb_get_urb(urb);
2007         spin_unlock_irqrestore(&ps->lock, flags);
2008
2009         usb_kill_urb(urb);
2010         usb_put_urb(urb);
2011
2012         return 0;
2013 }
2014
2015 static void compute_isochronous_actual_length(struct urb *urb)
2016 {
2017         unsigned int i;
2018
2019         if (urb->number_of_packets > 0) {
2020                 urb->actual_length = 0;
2021                 for (i = 0; i < urb->number_of_packets; i++)
2022                         urb->actual_length +=
2023                                         urb->iso_frame_desc[i].actual_length;
2024         }
2025 }
2026
2027 static int processcompl(struct async *as, void __user * __user *arg)
2028 {
2029         struct urb *urb = as->urb;
2030         struct usbdevfs_urb __user *userurb = as->userurb;
2031         void __user *addr = as->userurb;
2032         unsigned int i;
2033
2034         compute_isochronous_actual_length(urb);
2035         if (as->userbuffer && urb->actual_length) {
2036                 if (copy_urb_data_to_user(as->userbuffer, urb))
2037                         goto err_out;
2038         }
2039         if (put_user(as->status, &userurb->status))
2040                 goto err_out;
2041         if (put_user(urb->actual_length, &userurb->actual_length))
2042                 goto err_out;
2043         if (put_user(urb->error_count, &userurb->error_count))
2044                 goto err_out;
2045
2046         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2047                 for (i = 0; i < urb->number_of_packets; i++) {
2048                         if (put_user(urb->iso_frame_desc[i].actual_length,
2049                                      &userurb->iso_frame_desc[i].actual_length))
2050                                 goto err_out;
2051                         if (put_user(urb->iso_frame_desc[i].status,
2052                                      &userurb->iso_frame_desc[i].status))
2053                                 goto err_out;
2054                 }
2055         }
2056
2057         if (put_user(addr, (void __user * __user *)arg))
2058                 return -EFAULT;
2059         return 0;
2060
2061 err_out:
2062         return -EFAULT;
2063 }
2064
2065 static struct async *reap_as(struct usb_dev_state *ps)
2066 {
2067         DECLARE_WAITQUEUE(wait, current);
2068         struct async *as = NULL;
2069         struct usb_device *dev = ps->dev;
2070
2071         add_wait_queue(&ps->wait, &wait);
2072         for (;;) {
2073                 __set_current_state(TASK_INTERRUPTIBLE);
2074                 as = async_getcompleted(ps);
2075                 if (as || !connected(ps))
2076                         break;
2077                 if (signal_pending(current))
2078                         break;
2079                 usb_unlock_device(dev);
2080                 schedule();
2081                 usb_lock_device(dev);
2082         }
2083         remove_wait_queue(&ps->wait, &wait);
2084         set_current_state(TASK_RUNNING);
2085         return as;
2086 }
2087
2088 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2089 {
2090         struct async *as = reap_as(ps);
2091
2092         if (as) {
2093                 int retval;
2094
2095                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2096                 retval = processcompl(as, (void __user * __user *)arg);
2097                 free_async(as);
2098                 return retval;
2099         }
2100         if (signal_pending(current))
2101                 return -EINTR;
2102         return -ENODEV;
2103 }
2104
2105 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2106 {
2107         int retval;
2108         struct async *as;
2109
2110         as = async_getcompleted(ps);
2111         if (as) {
2112                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2113                 retval = processcompl(as, (void __user * __user *)arg);
2114                 free_async(as);
2115         } else {
2116                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2117         }
2118         return retval;
2119 }
2120
2121 #ifdef CONFIG_COMPAT
2122 static int proc_control_compat(struct usb_dev_state *ps,
2123                                 struct usbdevfs_ctrltransfer32 __user *p32)
2124 {
2125         struct usbdevfs_ctrltransfer ctrl;
2126         u32 udata;
2127
2128         if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2129             get_user(udata, &p32->data))
2130                 return -EFAULT;
2131         ctrl.data = compat_ptr(udata);
2132         return do_proc_control(ps, &ctrl);
2133 }
2134
2135 static int proc_bulk_compat(struct usb_dev_state *ps,
2136                         struct usbdevfs_bulktransfer32 __user *p32)
2137 {
2138         struct usbdevfs_bulktransfer bulk;
2139         compat_caddr_t addr;
2140
2141         if (get_user(bulk.ep, &p32->ep) ||
2142             get_user(bulk.len, &p32->len) ||
2143             get_user(bulk.timeout, &p32->timeout) ||
2144             get_user(addr, &p32->data))
2145                 return -EFAULT;
2146         bulk.data = compat_ptr(addr);
2147         return do_proc_bulk(ps, &bulk);
2148 }
2149
2150 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2151 {
2152         struct usbdevfs_disconnectsignal32 ds;
2153
2154         if (copy_from_user(&ds, arg, sizeof(ds)))
2155                 return -EFAULT;
2156         ps->discsignr = ds.signr;
2157         ps->disccontext.sival_int = ds.context;
2158         return 0;
2159 }
2160
2161 static int get_urb32(struct usbdevfs_urb *kurb,
2162                      struct usbdevfs_urb32 __user *uurb)
2163 {
2164         struct usbdevfs_urb32 urb32;
2165         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2166                 return -EFAULT;
2167         kurb->type = urb32.type;
2168         kurb->endpoint = urb32.endpoint;
2169         kurb->status = urb32.status;
2170         kurb->flags = urb32.flags;
2171         kurb->buffer = compat_ptr(urb32.buffer);
2172         kurb->buffer_length = urb32.buffer_length;
2173         kurb->actual_length = urb32.actual_length;
2174         kurb->start_frame = urb32.start_frame;
2175         kurb->number_of_packets = urb32.number_of_packets;
2176         kurb->error_count = urb32.error_count;
2177         kurb->signr = urb32.signr;
2178         kurb->usercontext = compat_ptr(urb32.usercontext);
2179         return 0;
2180 }
2181
2182 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2183 {
2184         struct usbdevfs_urb uurb;
2185         sigval_t userurb_sigval;
2186
2187         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2188                 return -EFAULT;
2189
2190         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2191         userurb_sigval.sival_int = ptr_to_compat(arg);
2192
2193         return proc_do_submiturb(ps, &uurb,
2194                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2195                         arg, userurb_sigval);
2196 }
2197
2198 static int processcompl_compat(struct async *as, void __user * __user *arg)
2199 {
2200         struct urb *urb = as->urb;
2201         struct usbdevfs_urb32 __user *userurb = as->userurb;
2202         void __user *addr = as->userurb;
2203         unsigned int i;
2204
2205         compute_isochronous_actual_length(urb);
2206         if (as->userbuffer && urb->actual_length) {
2207                 if (copy_urb_data_to_user(as->userbuffer, urb))
2208                         return -EFAULT;
2209         }
2210         if (put_user(as->status, &userurb->status))
2211                 return -EFAULT;
2212         if (put_user(urb->actual_length, &userurb->actual_length))
2213                 return -EFAULT;
2214         if (put_user(urb->error_count, &userurb->error_count))
2215                 return -EFAULT;
2216
2217         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2218                 for (i = 0; i < urb->number_of_packets; i++) {
2219                         if (put_user(urb->iso_frame_desc[i].actual_length,
2220                                      &userurb->iso_frame_desc[i].actual_length))
2221                                 return -EFAULT;
2222                         if (put_user(urb->iso_frame_desc[i].status,
2223                                      &userurb->iso_frame_desc[i].status))
2224                                 return -EFAULT;
2225                 }
2226         }
2227
2228         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2229                 return -EFAULT;
2230         return 0;
2231 }
2232
2233 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2234 {
2235         struct async *as = reap_as(ps);
2236
2237         if (as) {
2238                 int retval;
2239
2240                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2241                 retval = processcompl_compat(as, (void __user * __user *)arg);
2242                 free_async(as);
2243                 return retval;
2244         }
2245         if (signal_pending(current))
2246                 return -EINTR;
2247         return -ENODEV;
2248 }
2249
2250 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2251 {
2252         int retval;
2253         struct async *as;
2254
2255         as = async_getcompleted(ps);
2256         if (as) {
2257                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2258                 retval = processcompl_compat(as, (void __user * __user *)arg);
2259                 free_async(as);
2260         } else {
2261                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2262         }
2263         return retval;
2264 }
2265
2266
2267 #endif
2268
2269 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2270 {
2271         struct usbdevfs_disconnectsignal ds;
2272
2273         if (copy_from_user(&ds, arg, sizeof(ds)))
2274                 return -EFAULT;
2275         ps->discsignr = ds.signr;
2276         ps->disccontext.sival_ptr = ds.context;
2277         return 0;
2278 }
2279
2280 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2281 {
2282         unsigned int ifnum;
2283
2284         if (get_user(ifnum, (unsigned int __user *)arg))
2285                 return -EFAULT;
2286         return claimintf(ps, ifnum);
2287 }
2288
2289 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2290 {
2291         unsigned int ifnum;
2292         int ret;
2293
2294         if (get_user(ifnum, (unsigned int __user *)arg))
2295                 return -EFAULT;
2296         ret = releaseintf(ps, ifnum);
2297         if (ret < 0)
2298                 return ret;
2299         destroy_async_on_interface(ps, ifnum);
2300         return 0;
2301 }
2302
2303 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2304 {
2305         int                     size;
2306         void                    *buf = NULL;
2307         int                     retval = 0;
2308         struct usb_interface    *intf = NULL;
2309         struct usb_driver       *driver = NULL;
2310
2311         if (ps->privileges_dropped)
2312                 return -EACCES;
2313
2314         if (!connected(ps))
2315                 return -ENODEV;
2316
2317         /* alloc buffer */
2318         size = _IOC_SIZE(ctl->ioctl_code);
2319         if (size > 0) {
2320                 buf = kmalloc(size, GFP_KERNEL);
2321                 if (buf == NULL)
2322                         return -ENOMEM;
2323                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2324                         if (copy_from_user(buf, ctl->data, size)) {
2325                                 kfree(buf);
2326                                 return -EFAULT;
2327                         }
2328                 } else {
2329                         memset(buf, 0, size);
2330                 }
2331         }
2332
2333         if (ps->dev->state != USB_STATE_CONFIGURED)
2334                 retval = -EHOSTUNREACH;
2335         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2336                 retval = -EINVAL;
2337         else switch (ctl->ioctl_code) {
2338
2339         /* disconnect kernel driver from interface */
2340         case USBDEVFS_DISCONNECT:
2341                 if (intf->dev.driver) {
2342                         driver = to_usb_driver(intf->dev.driver);
2343                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2344                         usb_driver_release_interface(driver, intf);
2345                 } else
2346                         retval = -ENODATA;
2347                 break;
2348
2349         /* let kernel drivers try to (re)bind to the interface */
2350         case USBDEVFS_CONNECT:
2351                 if (!intf->dev.driver)
2352                         retval = device_attach(&intf->dev);
2353                 else
2354                         retval = -EBUSY;
2355                 break;
2356
2357         /* talk directly to the interface's driver */
2358         default:
2359                 if (intf->dev.driver)
2360                         driver = to_usb_driver(intf->dev.driver);
2361                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2362                         retval = -ENOTTY;
2363                 } else {
2364                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2365                         if (retval == -ENOIOCTLCMD)
2366                                 retval = -ENOTTY;
2367                 }
2368         }
2369
2370         /* cleanup and return */
2371         if (retval >= 0
2372                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2373                         && size > 0
2374                         && copy_to_user(ctl->data, buf, size) != 0)
2375                 retval = -EFAULT;
2376
2377         kfree(buf);
2378         return retval;
2379 }
2380
2381 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2382 {
2383         struct usbdevfs_ioctl   ctrl;
2384
2385         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2386                 return -EFAULT;
2387         return proc_ioctl(ps, &ctrl);
2388 }
2389
2390 #ifdef CONFIG_COMPAT
2391 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2392 {
2393         struct usbdevfs_ioctl32 ioc32;
2394         struct usbdevfs_ioctl ctrl;
2395
2396         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2397                 return -EFAULT;
2398         ctrl.ifno = ioc32.ifno;
2399         ctrl.ioctl_code = ioc32.ioctl_code;
2400         ctrl.data = compat_ptr(ioc32.data);
2401         return proc_ioctl(ps, &ctrl);
2402 }
2403 #endif
2404
2405 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2406 {
2407         unsigned portnum;
2408         int rc;
2409
2410         if (get_user(portnum, (unsigned __user *) arg))
2411                 return -EFAULT;
2412         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2413         if (rc == 0)
2414                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2415                         portnum, task_pid_nr(current), current->comm);
2416         return rc;
2417 }
2418
2419 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2420 {
2421         unsigned portnum;
2422
2423         if (get_user(portnum, (unsigned __user *) arg))
2424                 return -EFAULT;
2425         return usb_hub_release_port(ps->dev, portnum, ps);
2426 }
2427
2428 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2429 {
2430         __u32 caps;
2431
2432         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2433                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2434                         USBDEVFS_CAP_DROP_PRIVILEGES |
2435                         USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2436         if (!ps->dev->bus->no_stop_on_short)
2437                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2438         if (ps->dev->bus->sg_tablesize)
2439                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2440
2441         if (put_user(caps, (__u32 __user *)arg))
2442                 return -EFAULT;
2443
2444         return 0;
2445 }
2446
2447 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2448 {
2449         struct usbdevfs_disconnect_claim dc;
2450         struct usb_interface *intf;
2451
2452         if (copy_from_user(&dc, arg, sizeof(dc)))
2453                 return -EFAULT;
2454
2455         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2456         if (!intf)
2457                 return -EINVAL;
2458
2459         if (intf->dev.driver) {
2460                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2461
2462                 if (ps->privileges_dropped)
2463                         return -EACCES;
2464
2465                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2466                                 strncmp(dc.driver, intf->dev.driver->name,
2467                                         sizeof(dc.driver)) != 0)
2468                         return -EBUSY;
2469
2470                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2471                                 strncmp(dc.driver, intf->dev.driver->name,
2472                                         sizeof(dc.driver)) == 0)
2473                         return -EBUSY;
2474
2475                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2476                 usb_driver_release_interface(driver, intf);
2477         }
2478
2479         return claimintf(ps, dc.interface);
2480 }
2481
2482 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2483 {
2484         unsigned num_streams, num_eps;
2485         struct usb_host_endpoint **eps;
2486         struct usb_interface *intf;
2487         int r;
2488
2489         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2490                                    &eps, &intf);
2491         if (r)
2492                 return r;
2493
2494         destroy_async_on_interface(ps,
2495                                    intf->altsetting[0].desc.bInterfaceNumber);
2496
2497         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2498         kfree(eps);
2499         return r;
2500 }
2501
2502 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2503 {
2504         unsigned num_eps;
2505         struct usb_host_endpoint **eps;
2506         struct usb_interface *intf;
2507         int r;
2508
2509         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2510         if (r)
2511                 return r;
2512
2513         destroy_async_on_interface(ps,
2514                                    intf->altsetting[0].desc.bInterfaceNumber);
2515
2516         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2517         kfree(eps);
2518         return r;
2519 }
2520
2521 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2522 {
2523         u32 data;
2524
2525         if (copy_from_user(&data, arg, sizeof(data)))
2526                 return -EFAULT;
2527
2528         /* This is a one way operation. Once privileges are
2529          * dropped, you cannot regain them. You may however reissue
2530          * this ioctl to shrink the allowed interfaces mask.
2531          */
2532         ps->interface_allowed_mask &= data;
2533         ps->privileges_dropped = true;
2534
2535         return 0;
2536 }
2537
2538 static int proc_forbid_suspend(struct usb_dev_state *ps)
2539 {
2540         int ret = 0;
2541
2542         if (ps->suspend_allowed) {
2543                 ret = usb_autoresume_device(ps->dev);
2544                 if (ret == 0)
2545                         ps->suspend_allowed = false;
2546                 else if (ret != -ENODEV)
2547                         ret = -EIO;
2548         }
2549         return ret;
2550 }
2551
2552 static int proc_allow_suspend(struct usb_dev_state *ps)
2553 {
2554         if (!connected(ps))
2555                 return -ENODEV;
2556
2557         WRITE_ONCE(ps->not_yet_resumed, 1);
2558         if (!ps->suspend_allowed) {
2559                 usb_autosuspend_device(ps->dev);
2560                 ps->suspend_allowed = true;
2561         }
2562         return 0;
2563 }
2564
2565 static int proc_wait_for_resume(struct usb_dev_state *ps)
2566 {
2567         int ret;
2568
2569         usb_unlock_device(ps->dev);
2570         ret = wait_event_interruptible(ps->wait_for_resume,
2571                         READ_ONCE(ps->not_yet_resumed) == 0);
2572         usb_lock_device(ps->dev);
2573
2574         if (ret != 0)
2575                 return -EINTR;
2576         return proc_forbid_suspend(ps);
2577 }
2578
2579 /*
2580  * NOTE:  All requests here that have interface numbers as parameters
2581  * are assuming that somehow the configuration has been prevented from
2582  * changing.  But there's no mechanism to ensure that...
2583  */
2584 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2585                                 void __user *p)
2586 {
2587         struct usb_dev_state *ps = file->private_data;
2588         struct inode *inode = file_inode(file);
2589         struct usb_device *dev = ps->dev;
2590         int ret = -ENOTTY;
2591
2592         if (!(file->f_mode & FMODE_WRITE))
2593                 return -EPERM;
2594
2595         usb_lock_device(dev);
2596
2597         /* Reap operations are allowed even after disconnection */
2598         switch (cmd) {
2599         case USBDEVFS_REAPURB:
2600                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2601                 ret = proc_reapurb(ps, p);
2602                 goto done;
2603
2604         case USBDEVFS_REAPURBNDELAY:
2605                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2606                 ret = proc_reapurbnonblock(ps, p);
2607                 goto done;
2608
2609 #ifdef CONFIG_COMPAT
2610         case USBDEVFS_REAPURB32:
2611                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2612                 ret = proc_reapurb_compat(ps, p);
2613                 goto done;
2614
2615         case USBDEVFS_REAPURBNDELAY32:
2616                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2617                 ret = proc_reapurbnonblock_compat(ps, p);
2618                 goto done;
2619 #endif
2620         }
2621
2622         if (!connected(ps)) {
2623                 usb_unlock_device(dev);
2624                 return -ENODEV;
2625         }
2626
2627         switch (cmd) {
2628         case USBDEVFS_CONTROL:
2629                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2630                 ret = proc_control(ps, p);
2631                 if (ret >= 0)
2632                         inode->i_mtime = current_time(inode);
2633                 break;
2634
2635         case USBDEVFS_BULK:
2636                 snoop(&dev->dev, "%s: BULK\n", __func__);
2637                 ret = proc_bulk(ps, p);
2638                 if (ret >= 0)
2639                         inode->i_mtime = current_time(inode);
2640                 break;
2641
2642         case USBDEVFS_RESETEP:
2643                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2644                 ret = proc_resetep(ps, p);
2645                 if (ret >= 0)
2646                         inode->i_mtime = current_time(inode);
2647                 break;
2648
2649         case USBDEVFS_RESET:
2650                 snoop(&dev->dev, "%s: RESET\n", __func__);
2651                 ret = proc_resetdevice(ps);
2652                 break;
2653
2654         case USBDEVFS_CLEAR_HALT:
2655                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2656                 ret = proc_clearhalt(ps, p);
2657                 if (ret >= 0)
2658                         inode->i_mtime = current_time(inode);
2659                 break;
2660
2661         case USBDEVFS_GETDRIVER:
2662                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2663                 ret = proc_getdriver(ps, p);
2664                 break;
2665
2666         case USBDEVFS_CONNECTINFO:
2667                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2668                 ret = proc_connectinfo(ps, p);
2669                 break;
2670
2671         case USBDEVFS_SETINTERFACE:
2672                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2673                 ret = proc_setintf(ps, p);
2674                 break;
2675
2676         case USBDEVFS_SETCONFIGURATION:
2677                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2678                 ret = proc_setconfig(ps, p);
2679                 break;
2680
2681         case USBDEVFS_SUBMITURB:
2682                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2683                 ret = proc_submiturb(ps, p);
2684                 if (ret >= 0)
2685                         inode->i_mtime = current_time(inode);
2686                 break;
2687
2688 #ifdef CONFIG_COMPAT
2689         case USBDEVFS_CONTROL32:
2690                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2691                 ret = proc_control_compat(ps, p);
2692                 if (ret >= 0)
2693                         inode->i_mtime = current_time(inode);
2694                 break;
2695
2696         case USBDEVFS_BULK32:
2697                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2698                 ret = proc_bulk_compat(ps, p);
2699                 if (ret >= 0)
2700                         inode->i_mtime = current_time(inode);
2701                 break;
2702
2703         case USBDEVFS_DISCSIGNAL32:
2704                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2705                 ret = proc_disconnectsignal_compat(ps, p);
2706                 break;
2707
2708         case USBDEVFS_SUBMITURB32:
2709                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2710                 ret = proc_submiturb_compat(ps, p);
2711                 if (ret >= 0)
2712                         inode->i_mtime = current_time(inode);
2713                 break;
2714
2715         case USBDEVFS_IOCTL32:
2716                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2717                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2718                 break;
2719 #endif
2720
2721         case USBDEVFS_DISCARDURB:
2722                 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2723                 ret = proc_unlinkurb(ps, p);
2724                 break;
2725
2726         case USBDEVFS_DISCSIGNAL:
2727                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2728                 ret = proc_disconnectsignal(ps, p);
2729                 break;
2730
2731         case USBDEVFS_CLAIMINTERFACE:
2732                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2733                 ret = proc_claiminterface(ps, p);
2734                 break;
2735
2736         case USBDEVFS_RELEASEINTERFACE:
2737                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2738                 ret = proc_releaseinterface(ps, p);
2739                 break;
2740
2741         case USBDEVFS_IOCTL:
2742                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2743                 ret = proc_ioctl_default(ps, p);
2744                 break;
2745
2746         case USBDEVFS_CLAIM_PORT:
2747                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2748                 ret = proc_claim_port(ps, p);
2749                 break;
2750
2751         case USBDEVFS_RELEASE_PORT:
2752                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2753                 ret = proc_release_port(ps, p);
2754                 break;
2755         case USBDEVFS_GET_CAPABILITIES:
2756                 ret = proc_get_capabilities(ps, p);
2757                 break;
2758         case USBDEVFS_DISCONNECT_CLAIM:
2759                 ret = proc_disconnect_claim(ps, p);
2760                 break;
2761         case USBDEVFS_ALLOC_STREAMS:
2762                 ret = proc_alloc_streams(ps, p);
2763                 break;
2764         case USBDEVFS_FREE_STREAMS:
2765                 ret = proc_free_streams(ps, p);
2766                 break;
2767         case USBDEVFS_DROP_PRIVILEGES:
2768                 ret = proc_drop_privileges(ps, p);
2769                 break;
2770         case USBDEVFS_GET_SPEED:
2771                 ret = ps->dev->speed;
2772                 break;
2773         case USBDEVFS_FORBID_SUSPEND:
2774                 ret = proc_forbid_suspend(ps);
2775                 break;
2776         case USBDEVFS_ALLOW_SUSPEND:
2777                 ret = proc_allow_suspend(ps);
2778                 break;
2779         case USBDEVFS_WAIT_FOR_RESUME:
2780                 ret = proc_wait_for_resume(ps);
2781                 break;
2782         }
2783
2784         /* Handle variable-length commands */
2785         switch (cmd & ~IOCSIZE_MASK) {
2786         case USBDEVFS_CONNINFO_EX(0):
2787                 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2788                 break;
2789         }
2790
2791  done:
2792         usb_unlock_device(dev);
2793         if (ret >= 0)
2794                 inode->i_atime = current_time(inode);
2795         return ret;
2796 }
2797
2798 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2799                         unsigned long arg)
2800 {
2801         int ret;
2802
2803         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2804
2805         return ret;
2806 }
2807
2808 /* No kernel lock - fine */
2809 static __poll_t usbdev_poll(struct file *file,
2810                                 struct poll_table_struct *wait)
2811 {
2812         struct usb_dev_state *ps = file->private_data;
2813         __poll_t mask = 0;
2814
2815         poll_wait(file, &ps->wait, wait);
2816         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2817                 mask |= EPOLLOUT | EPOLLWRNORM;
2818         if (!connected(ps))
2819                 mask |= EPOLLHUP;
2820         if (list_empty(&ps->list))
2821                 mask |= EPOLLERR;
2822         return mask;
2823 }
2824
2825 const struct file_operations usbdev_file_operations = {
2826         .owner =          THIS_MODULE,
2827         .llseek =         no_seek_end_llseek,
2828         .read =           usbdev_read,
2829         .poll =           usbdev_poll,
2830         .unlocked_ioctl = usbdev_ioctl,
2831         .compat_ioctl =   compat_ptr_ioctl,
2832         .mmap =           usbdev_mmap,
2833         .open =           usbdev_open,
2834         .release =        usbdev_release,
2835 };
2836
2837 static void usbdev_remove(struct usb_device *udev)
2838 {
2839         struct usb_dev_state *ps;
2840
2841         /* Protect against simultaneous resume */
2842         mutex_lock(&usbfs_mutex);
2843         while (!list_empty(&udev->filelist)) {
2844                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2845                 destroy_all_async(ps);
2846                 wake_up_all(&ps->wait);
2847                 WRITE_ONCE(ps->not_yet_resumed, 0);
2848                 wake_up_all(&ps->wait_for_resume);
2849                 list_del_init(&ps->list);
2850                 if (ps->discsignr)
2851                         kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2852                                              ps->disc_pid, ps->cred);
2853         }
2854         mutex_unlock(&usbfs_mutex);
2855 }
2856
2857 static int usbdev_notify(struct notifier_block *self,
2858                                unsigned long action, void *dev)
2859 {
2860         switch (action) {
2861         case USB_DEVICE_ADD:
2862                 break;
2863         case USB_DEVICE_REMOVE:
2864                 usbdev_remove(dev);
2865                 break;
2866         }
2867         return NOTIFY_OK;
2868 }
2869
2870 static struct notifier_block usbdev_nb = {
2871         .notifier_call =        usbdev_notify,
2872 };
2873
2874 static struct cdev usb_device_cdev;
2875
2876 int __init usb_devio_init(void)
2877 {
2878         int retval;
2879
2880         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2881                                         "usb_device");
2882         if (retval) {
2883                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2884                 goto out;
2885         }
2886         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2887         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2888         if (retval) {
2889                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2890                        USB_DEVICE_MAJOR);
2891                 goto error_cdev;
2892         }
2893         usb_register_notify(&usbdev_nb);
2894 out:
2895         return retval;
2896
2897 error_cdev:
2898         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2899         goto out;
2900 }
2901
2902 void usb_devio_cleanup(void)
2903 {
2904         usb_unregister_notify(&usbdev_nb);
2905         cdev_del(&usb_device_cdev);
2906         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2907 }