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 atomic64_t usbfs_memory_usage;   /* Total memory currently allocated */
 143
 144 /* Check whether it's okay to allocate more memory for a transfer */
 145 static int usbfs_increase_memory_usage(u64 amount)
 146 {
 147         u64 lim;
 148
 149         lim = READ_ONCE(usbfs_memory_mb);
 150         lim <<= 20;
 151
 152         atomic64_add(amount, &usbfs_memory_usage);
 153
 154         if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
 155                 atomic64_sub(amount, &usbfs_memory_usage);
 156                 return -ENOMEM;
 157         }
 158
 159         return 0;
 160 }
 161
 162 /* Memory for a transfer is being deallocated */
 163 static void usbfs_decrease_memory_usage(u64 amount)
 164 {
 165         atomic64_sub(amount, &usbfs_memory_usage);
 166 }
 167
 168 static int connected(struct usb_dev_state *ps)
 169 {
 170         return (!list_empty(&ps->list) &&
 171                         ps->dev->state != USB_STATE_NOTATTACHED);
 172 }
 173
 174 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 175 {
 176         struct usb_dev_state *ps = usbm->ps;
 177         unsigned long flags;
 178
 179         spin_lock_irqsave(&ps->lock, flags);
 180         --*count;
 181         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 182                 list_del(&usbm->memlist);
 183                 spin_unlock_irqrestore(&ps->lock, flags);
 184
 185                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 186                                 usbm->dma_handle);
 187                 usbfs_decrease_memory_usage(
 188                         usbm->size + sizeof(struct usb_memory));
 189                 kfree(usbm);
 190         } else {
 191                 spin_unlock_irqrestore(&ps->lock, flags);
 192         }
 193 }
 194
 195 static void usbdev_vm_open(struct vm_area_struct *vma)
 196 {
 197         struct usb_memory *usbm = vma->vm_private_data;
 198         unsigned long flags;
 199
 200         spin_lock_irqsave(&usbm->ps->lock, flags);
 201         ++usbm->vma_use_count;
 202         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 203 }
 204
 205 static void usbdev_vm_close(struct vm_area_struct *vma)
 206 {
 207         struct usb_memory *usbm = vma->vm_private_data;
 208
 209         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 210 }
 211
 212 static const struct vm_operations_struct usbdev_vm_ops = {
 213         .open = usbdev_vm_open,
 214         .close = usbdev_vm_close
 215 };
 216
 217 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 218 {
 219         struct usb_memory *usbm = NULL;
 220         struct usb_dev_state *ps = file->private_data;
 221         struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
 222         size_t size = vma->vm_end - vma->vm_start;
 223         void *mem;
 224         unsigned long flags;
 225         dma_addr_t dma_handle;
 226         int ret;
 227
 228         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 229         if (ret)
 230                 goto error;
 231
 232         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 233         if (!usbm) {
 234                 ret = -ENOMEM;
 235                 goto error_decrease_mem;
 236         }
 237
 238         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 239                         &dma_handle);
 240         if (!mem) {
 241                 ret = -ENOMEM;
 242                 goto error_free_usbm;
 243         }
 244
 245         memset(mem, 0, size);
 246
 247         usbm->mem = mem;
 248         usbm->dma_handle = dma_handle;
 249         usbm->size = size;
 250         usbm->ps = ps;
 251         usbm->vm_start = vma->vm_start;
 252         usbm->vma_use_count = 1;
 253         INIT_LIST_HEAD(&usbm->memlist);
 254
 255         if (hcd->localmem_pool || !hcd_uses_dma(hcd)) {
 256                 if (remap_pfn_range(vma, vma->vm_start,
 257                                     virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 258                                     size, vma->vm_page_prot) < 0) {
 259                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 260                         return -EAGAIN;
 261                 }
 262         } else {
 263                 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
 264                                       size)) {
 265                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 266                         return -EAGAIN;
 267                 }
 268         }
 269
 270         vma->vm_flags |= VM_IO;
 271         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 272         vma->vm_ops = &usbdev_vm_ops;
 273         vma->vm_private_data = usbm;
 274
 275         spin_lock_irqsave(&ps->lock, flags);
 276         list_add_tail(&usbm->memlist, &ps->memory_list);
 277         spin_unlock_irqrestore(&ps->lock, flags);
 278
 279         return 0;
 280
 281 error_free_usbm:
 282         kfree(usbm);
 283 error_decrease_mem:
 284         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 285 error:
 286         return ret;
 287 }
 288
 289 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 290                            loff_t *ppos)
 291 {
 292         struct usb_dev_state *ps = file->private_data;
 293         struct usb_device *dev = ps->dev;
 294         ssize_t ret = 0;
 295         unsigned len;
 296         loff_t pos;
 297         int i;
 298
 299         pos = *ppos;
 300         usb_lock_device(dev);
 301         if (!connected(ps)) {
 302                 ret = -ENODEV;
 303                 goto err;
 304         } else if (pos < 0) {
 305                 ret = -EINVAL;
 306                 goto err;
 307         }
 308
 309         if (pos < sizeof(struct usb_device_descriptor)) {
 310                 /* 18 bytes - fits on the stack */
 311                 struct usb_device_descriptor temp_desc;
 312
 313                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 314                 le16_to_cpus(&temp_desc.bcdUSB);
 315                 le16_to_cpus(&temp_desc.idVendor);
 316                 le16_to_cpus(&temp_desc.idProduct);
 317                 le16_to_cpus(&temp_desc.bcdDevice);
 318
 319                 len = sizeof(struct usb_device_descriptor) - pos;
 320                 if (len > nbytes)
 321                         len = nbytes;
 322                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 323                         ret = -EFAULT;
 324                         goto err;
 325                 }
 326
 327                 *ppos += len;
 328                 buf += len;
 329                 nbytes -= len;
 330                 ret += len;
 331         }
 332
 333         pos = sizeof(struct usb_device_descriptor);
 334         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 335                 struct usb_config_descriptor *config =
 336                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 337                 unsigned int length = le16_to_cpu(config->wTotalLength);
 338
 339                 if (*ppos < pos + length) {
 340
 341                         /* The descriptor may claim to be longer than it
 342                          * really is.  Here is the actual allocated length. */
 343                         unsigned alloclen =
 344                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 345
 346                         len = length - (*ppos - pos);
 347                         if (len > nbytes)
 348                                 len = nbytes;
 349
 350                         /* Simply don't write (skip over) unallocated parts */
 351                         if (alloclen > (*ppos - pos)) {
 352                                 alloclen -= (*ppos - pos);
 353                                 if (copy_to_user(buf,
 354                                     dev->rawdescriptors[i] + (*ppos - pos),
 355                                     min(len, alloclen))) {
 356                                         ret = -EFAULT;
 357                                         goto err;
 358                                 }
 359                         }
 360
 361                         *ppos += len;
 362                         buf += len;
 363                         nbytes -= len;
 364                         ret += len;
 365                 }
 366
 367                 pos += length;
 368         }
 369
 370 err:
 371         usb_unlock_device(dev);
 372         return ret;
 373 }
 374
 375 /*
 376  * async list handling
 377  */
 378
 379 static struct async *alloc_async(unsigned int numisoframes)
 380 {
 381         struct async *as;
 382
 383         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 384         if (!as)
 385                 return NULL;
 386         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 387         if (!as->urb) {
 388                 kfree(as);
 389                 return NULL;
 390         }
 391         return as;
 392 }
 393
 394 static void free_async(struct async *as)
 395 {
 396         int i;
 397
 398         put_pid(as->pid);
 399         if (as->cred)
 400                 put_cred(as->cred);
 401         for (i = 0; i < as->urb->num_sgs; i++) {
 402                 if (sg_page(&as->urb->sg[i]))
 403                         kfree(sg_virt(&as->urb->sg[i]));
 404         }
 405
 406         kfree(as->urb->sg);
 407         if (as->usbm == NULL)
 408                 kfree(as->urb->transfer_buffer);
 409         else
 410                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 411
 412         kfree(as->urb->setup_packet);
 413         usb_free_urb(as->urb);
 414         usbfs_decrease_memory_usage(as->mem_usage);
 415         kfree(as);
 416 }
 417
 418 static void async_newpending(struct async *as)
 419 {
 420         struct usb_dev_state *ps = as->ps;
 421         unsigned long flags;
 422
 423         spin_lock_irqsave(&ps->lock, flags);
 424         list_add_tail(&as->asynclist, &ps->async_pending);
 425         spin_unlock_irqrestore(&ps->lock, flags);
 426 }
 427
 428 static void async_removepending(struct async *as)
 429 {
 430         struct usb_dev_state *ps = as->ps;
 431         unsigned long flags;
 432
 433         spin_lock_irqsave(&ps->lock, flags);
 434         list_del_init(&as->asynclist);
 435         spin_unlock_irqrestore(&ps->lock, flags);
 436 }
 437
 438 static struct async *async_getcompleted(struct usb_dev_state *ps)
 439 {
 440         unsigned long flags;
 441         struct async *as = NULL;
 442
 443         spin_lock_irqsave(&ps->lock, flags);
 444         if (!list_empty(&ps->async_completed)) {
 445                 as = list_entry(ps->async_completed.next, struct async,
 446                                 asynclist);
 447                 list_del_init(&as->asynclist);
 448         }
 449         spin_unlock_irqrestore(&ps->lock, flags);
 450         return as;
 451 }
 452
 453 static struct async *async_getpending(struct usb_dev_state *ps,
 454                                              void __user *userurb)
 455 {
 456         struct async *as;
 457
 458         list_for_each_entry(as, &ps->async_pending, asynclist)
 459                 if (as->userurb == userurb) {
 460                         list_del_init(&as->asynclist);
 461                         return as;
 462                 }
 463
 464         return NULL;
 465 }
 466
 467 static void snoop_urb(struct usb_device *udev,
 468                 void __user *userurb, int pipe, unsigned length,
 469                 int timeout_or_status, enum snoop_when when,
 470                 unsigned char *data, unsigned data_len)
 471 {
 472         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 473         static const char *dirs[] = {"out", "in"};
 474         int ep;
 475         const char *t, *d;
 476
 477         if (!usbfs_snoop)
 478                 return;
 479
 480         ep = usb_pipeendpoint(pipe);
 481         t = types[usb_pipetype(pipe)];
 482         d = dirs[!!usb_pipein(pipe)];
 483
 484         if (userurb) {          /* Async */
 485                 if (when == SUBMIT)
 486                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 487                                         "length %u\n",
 488                                         userurb, ep, t, d, length);
 489                 else
 490                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 491                                         "actual_length %u status %d\n",
 492                                         userurb, ep, t, d, length,
 493                                         timeout_or_status);
 494         } else {
 495                 if (when == SUBMIT)
 496                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 497                                         "timeout %d\n",
 498                                         ep, t, d, length, timeout_or_status);
 499                 else
 500                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 501                                         "status %d\n",
 502                                         ep, t, d, length, timeout_or_status);
 503         }
 504
 505         data_len = min(data_len, usbfs_snoop_max);
 506         if (data && data_len > 0) {
 507                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 508                         data, data_len, 1);
 509         }
 510 }
 511
 512 static void snoop_urb_data(struct urb *urb, unsigned len)
 513 {
 514         int i, size;
 515
 516         len = min(len, usbfs_snoop_max);
 517         if (!usbfs_snoop || len == 0)
 518                 return;
 519
 520         if (urb->num_sgs == 0) {
 521                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 522                         urb->transfer_buffer, len, 1);
 523                 return;
 524         }
 525
 526         for (i = 0; i < urb->num_sgs && len; i++) {
 527                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 528                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 529                         sg_virt(&urb->sg[i]), size, 1);
 530                 len -= size;
 531         }
 532 }
 533
 534 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 535 {
 536         unsigned i, len, size;
 537
 538         if (urb->number_of_packets > 0)         /* Isochronous */
 539                 len = urb->transfer_buffer_length;
 540         else                                    /* Non-Isoc */
 541                 len = urb->actual_length;
 542
 543         if (urb->num_sgs == 0) {
 544                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 545                         return -EFAULT;
 546                 return 0;
 547         }
 548
 549         for (i = 0; i < urb->num_sgs && len; i++) {
 550                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 551                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 552                         return -EFAULT;
 553                 userbuffer += size;
 554                 len -= size;
 555         }
 556
 557         return 0;
 558 }
 559
 560 #define AS_CONTINUATION 1
 561 #define AS_UNLINK       2
 562
 563 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 564 __releases(ps->lock)
 565 __acquires(ps->lock)
 566 {
 567         struct urb *urb;
 568         struct async *as;
 569
 570         /* Mark all the pending URBs that match bulk_addr, up to but not
 571          * including the first one without AS_CONTINUATION.  If such an
 572          * URB is encountered then a new transfer has already started so
 573          * the endpoint doesn't need to be disabled; otherwise it does.
 574          */
 575         list_for_each_entry(as, &ps->async_pending, asynclist) {
 576                 if (as->bulk_addr == bulk_addr) {
 577                         if (as->bulk_status != AS_CONTINUATION)
 578                                 goto rescan;
 579                         as->bulk_status = AS_UNLINK;
 580                         as->bulk_addr = 0;
 581                 }
 582         }
 583         ps->disabled_bulk_eps |= (1 << bulk_addr);
 584
 585         /* Now carefully unlink all the marked pending URBs */
 586  rescan:
 587         list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
 588                 if (as->bulk_status == AS_UNLINK) {
 589                         as->bulk_status = 0;            /* Only once */
 590                         urb = as->urb;
 591                         usb_get_urb(urb);
 592                         spin_unlock(&ps->lock);         /* Allow completions */
 593                         usb_unlink_urb(urb);
 594                         usb_put_urb(urb);
 595                         spin_lock(&ps->lock);
 596                         goto rescan;
 597                 }
 598         }
 599 }
 600
 601 static void async_completed(struct urb *urb)
 602 {
 603         struct async *as = urb->context;
 604         struct usb_dev_state *ps = as->ps;
 605         struct pid *pid = NULL;
 606         const struct cred *cred = NULL;
 607         unsigned long flags;
 608         sigval_t addr;
 609         int signr, errno;
 610
 611         spin_lock_irqsave(&ps->lock, flags);
 612         list_move_tail(&as->asynclist, &ps->async_completed);
 613         as->status = urb->status;
 614         signr = as->signr;
 615         if (signr) {
 616                 errno = as->status;
 617                 addr = as->userurb_sigval;
 618                 pid = get_pid(as->pid);
 619                 cred = get_cred(as->cred);
 620         }
 621         snoop(&urb->dev->dev, "urb complete\n");
 622         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 623                         as->status, COMPLETE, NULL, 0);
 624         if (usb_urb_dir_in(urb))
 625                 snoop_urb_data(urb, urb->actual_length);
 626
 627         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 628                         as->status != -ENOENT)
 629                 cancel_bulk_urbs(ps, as->bulk_addr);
 630
 631         wake_up(&ps->wait);
 632         spin_unlock_irqrestore(&ps->lock, flags);
 633
 634         if (signr) {
 635                 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
 636                 put_pid(pid);
 637                 put_cred(cred);
 638         }
 639 }
 640
 641 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 642 {
 643         struct urb *urb;
 644         struct async *as;
 645         unsigned long flags;
 646
 647         spin_lock_irqsave(&ps->lock, flags);
 648         while (!list_empty(list)) {
 649                 as = list_last_entry(list, struct async, asynclist);
 650                 list_del_init(&as->asynclist);
 651                 urb = as->urb;
 652                 usb_get_urb(urb);
 653
 654                 /* drop the spinlock so the completion handler can run */
 655                 spin_unlock_irqrestore(&ps->lock, flags);
 656                 usb_kill_urb(urb);
 657                 usb_put_urb(urb);
 658                 spin_lock_irqsave(&ps->lock, flags);
 659         }
 660         spin_unlock_irqrestore(&ps->lock, flags);
 661 }
 662
 663 static void destroy_async_on_interface(struct usb_dev_state *ps,
 664                                        unsigned int ifnum)
 665 {
 666         struct list_head *p, *q, hitlist;
 667         unsigned long flags;
 668
 669         INIT_LIST_HEAD(&hitlist);
 670         spin_lock_irqsave(&ps->lock, flags);
 671         list_for_each_safe(p, q, &ps->async_pending)
 672                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 673                         list_move_tail(p, &hitlist);
 674         spin_unlock_irqrestore(&ps->lock, flags);
 675         destroy_async(ps, &hitlist);
 676 }
 677
 678 static void destroy_all_async(struct usb_dev_state *ps)
 679 {
 680         destroy_async(ps, &ps->async_pending);
 681 }
 682
 683 /*
 684  * interface claims are made only at the request of user level code,
 685  * which can also release them (explicitly or by closing files).
 686  * they're also undone when devices disconnect.
 687  */
 688
 689 static int driver_probe(struct usb_interface *intf,
 690                         const struct usb_device_id *id)
 691 {
 692         return -ENODEV;
 693 }
 694
 695 static void driver_disconnect(struct usb_interface *intf)
 696 {
 697         struct usb_dev_state *ps = usb_get_intfdata(intf);
 698         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 699
 700         if (!ps)
 701                 return;
 702
 703         /* NOTE:  this relies on usbcore having canceled and completed
 704          * all pending I/O requests; 2.6 does that.
 705          */
 706
 707         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 708                 clear_bit(ifnum, &ps->ifclaimed);
 709         else
 710                 dev_warn(&intf->dev, "interface number %u out of range\n",
 711                          ifnum);
 712
 713         usb_set_intfdata(intf, NULL);
 714
 715         /* force async requests to complete */
 716         destroy_async_on_interface(ps, ifnum);
 717 }
 718
 719 /* We don't care about suspend/resume of claimed interfaces */
 720 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 721 {
 722         return 0;
 723 }
 724
 725 static int driver_resume(struct usb_interface *intf)
 726 {
 727         return 0;
 728 }
 729
 730 /* The following routines apply to the entire device, not interfaces */
 731 void usbfs_notify_suspend(struct usb_device *udev)
 732 {
 733         /* We don't need to handle this */
 734 }
 735
 736 void usbfs_notify_resume(struct usb_device *udev)
 737 {
 738         struct usb_dev_state *ps;
 739
 740         /* Protect against simultaneous remove or release */
 741         mutex_lock(&usbfs_mutex);
 742         list_for_each_entry(ps, &udev->filelist, list) {
 743                 WRITE_ONCE(ps->not_yet_resumed, 0);
 744                 wake_up_all(&ps->wait_for_resume);
 745         }
 746         mutex_unlock(&usbfs_mutex);
 747 }
 748
 749 struct usb_driver usbfs_driver = {
 750         .name =         "usbfs",
 751         .probe =        driver_probe,
 752         .disconnect =   driver_disconnect,
 753         .suspend =      driver_suspend,
 754         .resume =       driver_resume,
 755         .supports_autosuspend = 1,
 756 };
 757
 758 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 759 {
 760         struct usb_device *dev = ps->dev;
 761         struct usb_interface *intf;
 762         int err;
 763
 764         if (ifnum >= 8*sizeof(ps->ifclaimed))
 765                 return -EINVAL;
 766         /* already claimed */
 767         if (test_bit(ifnum, &ps->ifclaimed))
 768                 return 0;
 769
 770         if (ps->privileges_dropped &&
 771                         !test_bit(ifnum, &ps->interface_allowed_mask))
 772                 return -EACCES;
 773
 774         intf = usb_ifnum_to_if(dev, ifnum);
 775         if (!intf)
 776                 err = -ENOENT;
 777         else {
 778                 unsigned int old_suppress;
 779
 780                 /* suppress uevents while claiming interface */
 781                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 782                 dev_set_uevent_suppress(&intf->dev, 1);
 783                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 784                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 785         }
 786         if (err == 0)
 787                 set_bit(ifnum, &ps->ifclaimed);
 788         return err;
 789 }
 790
 791 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 792 {
 793         struct usb_device *dev;
 794         struct usb_interface *intf;
 795         int err;
 796
 797         err = -EINVAL;
 798         if (ifnum >= 8*sizeof(ps->ifclaimed))
 799                 return err;
 800         dev = ps->dev;
 801         intf = usb_ifnum_to_if(dev, ifnum);
 802         if (!intf)
 803                 err = -ENOENT;
 804         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 805                 unsigned int old_suppress;
 806
 807                 /* suppress uevents while releasing interface */
 808                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 809                 dev_set_uevent_suppress(&intf->dev, 1);
 810                 usb_driver_release_interface(&usbfs_driver, intf);
 811                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 812                 err = 0;
 813         }
 814         return err;
 815 }
 816
 817 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 818 {
 819         if (ps->dev->state != USB_STATE_CONFIGURED)
 820                 return -EHOSTUNREACH;
 821         if (ifnum >= 8*sizeof(ps->ifclaimed))
 822                 return -EINVAL;
 823         if (test_bit(ifnum, &ps->ifclaimed))
 824                 return 0;
 825         /* if not yet claimed, claim it for the driver */
 826         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 827                  "interface %u before use\n", task_pid_nr(current),
 828                  current->comm, ifnum);
 829         return claimintf(ps, ifnum);
 830 }
 831
 832 static int findintfep(struct usb_device *dev, unsigned int ep)
 833 {
 834         unsigned int i, j, e;
 835         struct usb_interface *intf;
 836         struct usb_host_interface *alts;
 837         struct usb_endpoint_descriptor *endpt;
 838
 839         if (ep & ~(USB_DIR_IN|0xf))
 840                 return -EINVAL;
 841         if (!dev->actconfig)
 842                 return -ESRCH;
 843         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 844                 intf = dev->actconfig->interface[i];
 845                 for (j = 0; j < intf->num_altsetting; j++) {
 846                         alts = &intf->altsetting[j];
 847                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 848                                 endpt = &alts->endpoint[e].desc;
 849                                 if (endpt->bEndpointAddress == ep)
 850                                         return alts->desc.bInterfaceNumber;
 851                         }
 852                 }
 853         }
 854         return -ENOENT;
 855 }
 856
 857 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 858                            unsigned int request, unsigned int index)
 859 {
 860         int ret = 0;
 861         struct usb_host_interface *alt_setting;
 862
 863         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 864          && ps->dev->state != USB_STATE_ADDRESS
 865          && ps->dev->state != USB_STATE_CONFIGURED)
 866                 return -EHOSTUNREACH;
 867         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 868                 return 0;
 869
 870         /*
 871          * check for the special corner case 'get_device_id' in the printer
 872          * class specification, which we always want to allow as it is used
 873          * to query things like ink level, etc.
 874          */
 875         if (requesttype == 0xa1 && request == 0) {
 876                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 877                                                    index >> 8, index & 0xff);
 878                 if (alt_setting
 879                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 880                         return 0;
 881         }
 882
 883         index &= 0xff;
 884         switch (requesttype & USB_RECIP_MASK) {
 885         case USB_RECIP_ENDPOINT:
 886                 if ((index & ~USB_DIR_IN) == 0)
 887                         return 0;
 888                 ret = findintfep(ps->dev, index);
 889                 if (ret < 0) {
 890                         /*
 891                          * Some not fully compliant Win apps seem to get
 892                          * index wrong and have the endpoint number here
 893                          * rather than the endpoint address (with the
 894                          * correct direction). Win does let this through,
 895                          * so we'll not reject it here but leave it to
 896                          * the device to not break KVM. But we warn.
 897                          */
 898                         ret = findintfep(ps->dev, index ^ 0x80);
 899                         if (ret >= 0)
 900                                 dev_info(&ps->dev->dev,
 901                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 902                                         __func__, task_pid_nr(current),
 903                                         current->comm, index, index ^ 0x80);
 904                 }
 905                 if (ret >= 0)
 906                         ret = checkintf(ps, ret);
 907                 break;
 908
 909         case USB_RECIP_INTERFACE:
 910                 ret = checkintf(ps, index);
 911                 break;
 912         }
 913         return ret;
 914 }
 915
 916 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 917                                                      unsigned char ep)
 918 {
 919         if (ep & USB_ENDPOINT_DIR_MASK)
 920                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 921         else
 922                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 923 }
 924
 925 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 926                                   struct usbdevfs_streams __user *streams,
 927                                   unsigned int *num_streams_ret,
 928                                   unsigned int *num_eps_ret,
 929                                   struct usb_host_endpoint ***eps_ret,
 930                                   struct usb_interface **intf_ret)
 931 {
 932         unsigned int i, num_streams, num_eps;
 933         struct usb_host_endpoint **eps;
 934         struct usb_interface *intf = NULL;
 935         unsigned char ep;
 936         int ifnum, ret;
 937
 938         if (get_user(num_streams, &streams->num_streams) ||
 939             get_user(num_eps, &streams->num_eps))
 940                 return -EFAULT;
 941
 942         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 943                 return -EINVAL;
 944
 945         /* The XHCI controller allows max 2 ^ 16 streams */
 946         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 947                 return -EINVAL;
 948
 949         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 950         if (!eps)
 951                 return -ENOMEM;
 952
 953         for (i = 0; i < num_eps; i++) {
 954                 if (get_user(ep, &streams->eps[i])) {
 955                         ret = -EFAULT;
 956                         goto error;
 957                 }
 958                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 959                 if (!eps[i]) {
 960                         ret = -EINVAL;
 961                         goto error;
 962                 }
 963
 964                 /* usb_alloc/free_streams operate on an usb_interface */
 965                 ifnum = findintfep(ps->dev, ep);
 966                 if (ifnum < 0) {
 967                         ret = ifnum;
 968                         goto error;
 969                 }
 970
 971                 if (i == 0) {
 972                         ret = checkintf(ps, ifnum);
 973                         if (ret < 0)
 974                                 goto error;
 975                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 976                 } else {
 977                         /* Verify all eps belong to the same interface */
 978                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 979                                 ret = -EINVAL;
 980                                 goto error;
 981                         }
 982                 }
 983         }
 984
 985         if (num_streams_ret)
 986                 *num_streams_ret = num_streams;
 987         *num_eps_ret = num_eps;
 988         *eps_ret = eps;
 989         *intf_ret = intf;
 990
 991         return 0;
 992
 993 error:
 994         kfree(eps);
 995         return ret;
 996 }
 997
 998 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 999 {
1000         struct device *dev;
1001
1002         dev = bus_find_device_by_devt(&usb_bus_type, devt);
1003         if (!dev)
1004                 return NULL;
1005         return to_usb_device(dev);
1006 }
1007
1008 /*
1009  * file operations
1010  */
1011 static int usbdev_open(struct inode *inode, struct file *file)
1012 {
1013         struct usb_device *dev = NULL;
1014         struct usb_dev_state *ps;
1015         int ret;
1016
1017         ret = -ENOMEM;
1018         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1019         if (!ps)
1020                 goto out_free_ps;
1021
1022         ret = -ENODEV;
1023
1024         /* usbdev device-node */
1025         if (imajor(inode) == USB_DEVICE_MAJOR)
1026                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1027         if (!dev)
1028                 goto out_free_ps;
1029
1030         usb_lock_device(dev);
1031         if (dev->state == USB_STATE_NOTATTACHED)
1032                 goto out_unlock_device;
1033
1034         ret = usb_autoresume_device(dev);
1035         if (ret)
1036                 goto out_unlock_device;
1037
1038         ps->dev = dev;
1039         ps->file = file;
1040         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1041         spin_lock_init(&ps->lock);
1042         INIT_LIST_HEAD(&ps->list);
1043         INIT_LIST_HEAD(&ps->async_pending);
1044         INIT_LIST_HEAD(&ps->async_completed);
1045         INIT_LIST_HEAD(&ps->memory_list);
1046         init_waitqueue_head(&ps->wait);
1047         init_waitqueue_head(&ps->wait_for_resume);
1048         ps->disc_pid = get_pid(task_pid(current));
1049         ps->cred = get_current_cred();
1050         smp_wmb();
1051
1052         /* Can't race with resume; the device is already active */
1053         list_add_tail(&ps->list, &dev->filelist);
1054         file->private_data = ps;
1055         usb_unlock_device(dev);
1056         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1057                         current->comm);
1058         return ret;
1059
1060  out_unlock_device:
1061         usb_unlock_device(dev);
1062         usb_put_dev(dev);
1063  out_free_ps:
1064         kfree(ps);
1065         return ret;
1066 }
1067
1068 static int usbdev_release(struct inode *inode, struct file *file)
1069 {
1070         struct usb_dev_state *ps = file->private_data;
1071         struct usb_device *dev = ps->dev;
1072         unsigned int ifnum;
1073         struct async *as;
1074
1075         usb_lock_device(dev);
1076         usb_hub_release_all_ports(dev, ps);
1077
1078         /* Protect against simultaneous resume */
1079         mutex_lock(&usbfs_mutex);
1080         list_del_init(&ps->list);
1081         mutex_unlock(&usbfs_mutex);
1082
1083         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1084                         ifnum++) {
1085                 if (test_bit(ifnum, &ps->ifclaimed))
1086                         releaseintf(ps, ifnum);
1087         }
1088         destroy_all_async(ps);
1089         if (!ps->suspend_allowed)
1090                 usb_autosuspend_device(dev);
1091         usb_unlock_device(dev);
1092         usb_put_dev(dev);
1093         put_pid(ps->disc_pid);
1094         put_cred(ps->cred);
1095
1096         as = async_getcompleted(ps);
1097         while (as) {
1098                 free_async(as);
1099                 as = async_getcompleted(ps);
1100         }
1101
1102         kfree(ps);
1103         return 0;
1104 }
1105
1106 static void usbfs_blocking_completion(struct urb *urb)
1107 {
1108         complete((struct completion *) urb->context);
1109 }
1110
1111 /*
1112  * Much like usb_start_wait_urb, but returns status separately from
1113  * actual_length and uses a killable wait.
1114  */
1115 static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1116                 unsigned int *actlen)
1117 {
1118         DECLARE_COMPLETION_ONSTACK(ctx);
1119         unsigned long expire;
1120         int rc;
1121
1122         urb->context = &ctx;
1123         urb->complete = usbfs_blocking_completion;
1124         *actlen = 0;
1125         rc = usb_submit_urb(urb, GFP_KERNEL);
1126         if (unlikely(rc))
1127                 return rc;
1128
1129         expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
1130         rc = wait_for_completion_killable_timeout(&ctx, expire);
1131         if (rc <= 0) {
1132                 usb_kill_urb(urb);
1133                 *actlen = urb->actual_length;
1134                 if (urb->status != -ENOENT)
1135                         ;       /* Completed before it was killed */
1136                 else if (rc < 0)
1137                         return -EINTR;
1138                 else
1139                         return -ETIMEDOUT;
1140         }
1141         *actlen = urb->actual_length;
1142         return urb->status;
1143 }
1144
1145 static int do_proc_control(struct usb_dev_state *ps,
1146                 struct usbdevfs_ctrltransfer *ctrl)
1147 {
1148         struct usb_device *dev = ps->dev;
1149         unsigned int tmo;
1150         unsigned char *tbuf;
1151         unsigned int wLength, actlen;
1152         int i, pipe, ret;
1153         struct urb *urb = NULL;
1154         struct usb_ctrlrequest *dr = NULL;
1155
1156         ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1157                               ctrl->wIndex);
1158         if (ret)
1159                 return ret;
1160         wLength = ctrl->wLength;        /* To suppress 64k PAGE_SIZE warning */
1161         if (wLength > PAGE_SIZE)
1162                 return -EINVAL;
1163         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1164                         sizeof(struct usb_ctrlrequest));
1165         if (ret)
1166                 return ret;
1167
1168         ret = -ENOMEM;
1169         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1170         if (!tbuf)
1171                 goto done;
1172         urb = usb_alloc_urb(0, GFP_NOIO);
1173         if (!urb)
1174                 goto done;
1175         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
1176         if (!dr)
1177                 goto done;
1178
1179         dr->bRequestType = ctrl->bRequestType;
1180         dr->bRequest = ctrl->bRequest;
1181         dr->wValue = cpu_to_le16(ctrl->wValue);
1182         dr->wIndex = cpu_to_le16(ctrl->wIndex);
1183         dr->wLength = cpu_to_le16(ctrl->wLength);
1184
1185         tmo = ctrl->timeout;
1186         snoop(&dev->dev, "control urb: bRequestType=%02x "
1187                 "bRequest=%02x wValue=%04x "
1188                 "wIndex=%04x wLength=%04x\n",
1189                 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1190                 ctrl->wIndex, ctrl->wLength);
1191
1192         if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1193                 pipe = usb_rcvctrlpipe(dev, 0);
1194                 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1195                                 wLength, NULL, NULL);
1196                 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
1197
1198                 usb_unlock_device(dev);
1199                 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1200                 usb_lock_device(dev);
1201                 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
1202                 if (!i && actlen) {
1203                         if (copy_to_user(ctrl->data, tbuf, actlen)) {
1204                                 ret = -EFAULT;
1205                                 goto recv_fault;
1206                         }
1207                 }
1208         } else {
1209                 if (wLength) {
1210                         if (copy_from_user(tbuf, ctrl->data, wLength)) {
1211                                 ret = -EFAULT;
1212                                 goto done;
1213                         }
1214                 }
1215                 pipe = usb_sndctrlpipe(dev, 0);
1216                 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1217                                 wLength, NULL, NULL);
1218                 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
1219
1220                 usb_unlock_device(dev);
1221                 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1222                 usb_lock_device(dev);
1223                 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
1224         }
1225         if (i < 0 && i != -EPIPE) {
1226                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1227                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1228                            current->comm, ctrl->bRequestType, ctrl->bRequest,
1229                            ctrl->wLength, i);
1230         }
1231         ret = (i < 0 ? i : actlen);
1232
1233  recv_fault:
1234         /* Linger a bit, prior to the next control message. */
1235         if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1236                 msleep(200);
1237  done:
1238         kfree(dr);
1239         usb_free_urb(urb);
1240         free_page((unsigned long) tbuf);
1241         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1242                         sizeof(struct usb_ctrlrequest));
1243         return ret;
1244 }
1245
1246 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1247 {
1248         struct usbdevfs_ctrltransfer ctrl;
1249
1250         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1251                 return -EFAULT;
1252         return do_proc_control(ps, &ctrl);
1253 }
1254
1255 static int do_proc_bulk(struct usb_dev_state *ps,
1256                 struct usbdevfs_bulktransfer *bulk)
1257 {
1258         struct usb_device *dev = ps->dev;
1259         unsigned int tmo, len1, len2, pipe;
1260         unsigned char *tbuf;
1261         int i, ret;
1262         struct urb *urb = NULL;
1263         struct usb_host_endpoint *ep;
1264
1265         ret = findintfep(ps->dev, bulk->ep);
1266         if (ret < 0)
1267                 return ret;
1268         ret = checkintf(ps, ret);
1269         if (ret)
1270                 return ret;
1271
1272         len1 = bulk->len;
1273         if (len1 < 0 || len1 >= (INT_MAX - sizeof(struct urb)))
1274                 return -EINVAL;
1275
1276         if (bulk->ep & USB_DIR_IN)
1277                 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1278         else
1279                 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1280         ep = usb_pipe_endpoint(dev, pipe);
1281         if (!ep || !usb_endpoint_maxp(&ep->desc))
1282                 return -EINVAL;
1283         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1284         if (ret)
1285                 return ret;
1286
1287         /*
1288          * len1 can be almost arbitrarily large.  Don't WARN if it's
1289          * too big, just fail the request.
1290          */
1291         ret = -ENOMEM;
1292         tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1293         if (!tbuf)
1294                 goto done;
1295         urb = usb_alloc_urb(0, GFP_KERNEL);
1296         if (!urb)
1297                 goto done;
1298
1299         if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1300                         USB_ENDPOINT_XFER_INT) {
1301                 pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
1302                 usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
1303                                 NULL, NULL, ep->desc.bInterval);
1304         } else {
1305                 usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
1306         }
1307
1308         tmo = bulk->timeout;
1309         if (bulk->ep & 0x80) {
1310                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1311
1312                 usb_unlock_device(dev);
1313                 i = usbfs_start_wait_urb(urb, tmo, &len2);
1314                 usb_lock_device(dev);
1315                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1316
1317                 if (!i && len2) {
1318                         if (copy_to_user(bulk->data, tbuf, len2)) {
1319                                 ret = -EFAULT;
1320                                 goto done;
1321                         }
1322                 }
1323         } else {
1324                 if (len1) {
1325                         if (copy_from_user(tbuf, bulk->data, len1)) {
1326                                 ret = -EFAULT;
1327                                 goto done;
1328                         }
1329                 }
1330                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1331
1332                 usb_unlock_device(dev);
1333                 i = usbfs_start_wait_urb(urb, tmo, &len2);
1334                 usb_lock_device(dev);
1335                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1336         }
1337         ret = (i < 0 ? i : len2);
1338  done:
1339         usb_free_urb(urb);
1340         kfree(tbuf);
1341         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1342         return ret;
1343 }
1344
1345 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1346 {
1347         struct usbdevfs_bulktransfer bulk;
1348
1349         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1350                 return -EFAULT;
1351         return do_proc_bulk(ps, &bulk);
1352 }
1353
1354 static void check_reset_of_active_ep(struct usb_device *udev,
1355                 unsigned int epnum, char *ioctl_name)
1356 {
1357         struct usb_host_endpoint **eps;
1358         struct usb_host_endpoint *ep;
1359
1360         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1361         ep = eps[epnum & 0x0f];
1362         if (ep && !list_empty(&ep->urb_list))
1363                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1364                                 task_pid_nr(current), current->comm,
1365                                 ioctl_name, epnum);
1366 }
1367
1368 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1369 {
1370         unsigned int ep;
1371         int ret;
1372
1373         if (get_user(ep, (unsigned int __user *)arg))
1374                 return -EFAULT;
1375         ret = findintfep(ps->dev, ep);
1376         if (ret < 0)
1377                 return ret;
1378         ret = checkintf(ps, ret);
1379         if (ret)
1380                 return ret;
1381         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1382         usb_reset_endpoint(ps->dev, ep);
1383         return 0;
1384 }
1385
1386 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1387 {
1388         unsigned int ep;
1389         int pipe;
1390         int ret;
1391
1392         if (get_user(ep, (unsigned int __user *)arg))
1393                 return -EFAULT;
1394         ret = findintfep(ps->dev, ep);
1395         if (ret < 0)
1396                 return ret;
1397         ret = checkintf(ps, ret);
1398         if (ret)
1399                 return ret;
1400         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1401         if (ep & USB_DIR_IN)
1402                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1403         else
1404                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1405
1406         return usb_clear_halt(ps->dev, pipe);
1407 }
1408
1409 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1410 {
1411         struct usbdevfs_getdriver gd;
1412         struct usb_interface *intf;
1413         int ret;
1414
1415         if (copy_from_user(&gd, arg, sizeof(gd)))
1416                 return -EFAULT;
1417         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1418         if (!intf || !intf->dev.driver)
1419                 ret = -ENODATA;
1420         else {
1421                 strlcpy(gd.driver, intf->dev.driver->name,
1422                                 sizeof(gd.driver));
1423                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1424         }
1425         return ret;
1426 }
1427
1428 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1429 {
1430         struct usbdevfs_connectinfo ci;
1431
1432         memset(&ci, 0, sizeof(ci));
1433         ci.devnum = ps->dev->devnum;
1434         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1435
1436         if (copy_to_user(arg, &ci, sizeof(ci)))
1437                 return -EFAULT;
1438         return 0;
1439 }
1440
1441 static int proc_conninfo_ex(struct usb_dev_state *ps,
1442                             void __user *arg, size_t size)
1443 {
1444         struct usbdevfs_conninfo_ex ci;
1445         struct usb_device *udev = ps->dev;
1446
1447         if (size < sizeof(ci.size))
1448                 return -EINVAL;
1449
1450         memset(&ci, 0, sizeof(ci));
1451         ci.size = sizeof(ci);
1452         ci.busnum = udev->bus->busnum;
1453         ci.devnum = udev->devnum;
1454         ci.speed = udev->speed;
1455
1456         while (udev && udev->portnum != 0) {
1457                 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1458                         ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1459                                         udev->portnum;
1460                 udev = udev->parent;
1461         }
1462
1463         if (ci.num_ports < ARRAY_SIZE(ci.ports))
1464                 memmove(&ci.ports[0],
1465                         &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1466                         ci.num_ports);
1467
1468         if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1469                 return -EFAULT;
1470
1471         return 0;
1472 }
1473
1474 static int proc_resetdevice(struct usb_dev_state *ps)
1475 {
1476         struct usb_host_config *actconfig = ps->dev->actconfig;
1477         struct usb_interface *interface;
1478         int i, number;
1479
1480         /* Don't allow a device reset if the process has dropped the
1481          * privilege to do such things and any of the interfaces are
1482          * currently claimed.
1483          */
1484         if (ps->privileges_dropped && actconfig) {
1485                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1486                         interface = actconfig->interface[i];
1487                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1488                         if (usb_interface_claimed(interface) &&
1489                                         !test_bit(number, &ps->ifclaimed)) {
1490                                 dev_warn(&ps->dev->dev,
1491                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1492                                         number, interface->dev.driver->name, current->comm);
1493                                 return -EACCES;
1494                         }
1495                 }
1496         }
1497
1498         return usb_reset_device(ps->dev);
1499 }
1500
1501 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1502 {
1503         struct usbdevfs_setinterface setintf;
1504         int ret;
1505
1506         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1507                 return -EFAULT;
1508         ret = checkintf(ps, setintf.interface);
1509         if (ret)
1510                 return ret;
1511
1512         destroy_async_on_interface(ps, setintf.interface);
1513
1514         return usb_set_interface(ps->dev, setintf.interface,
1515                         setintf.altsetting);
1516 }
1517
1518 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1519 {
1520         int u;
1521         int status = 0;
1522         struct usb_host_config *actconfig;
1523
1524         if (get_user(u, (int __user *)arg))
1525                 return -EFAULT;
1526
1527         actconfig = ps->dev->actconfig;
1528
1529         /* Don't touch the device if any interfaces are claimed.
1530          * It could interfere with other drivers' operations, and if
1531          * an interface is claimed by usbfs it could easily deadlock.
1532          */
1533         if (actconfig) {
1534                 int i;
1535
1536                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1537                         if (usb_interface_claimed(actconfig->interface[i])) {
1538                                 dev_warn(&ps->dev->dev,
1539                                         "usbfs: interface %d claimed by %s "
1540                                         "while '%s' sets config #%d\n",
1541                                         actconfig->interface[i]
1542                                                 ->cur_altsetting
1543                                                 ->desc.bInterfaceNumber,
1544                                         actconfig->interface[i]
1545                                                 ->dev.driver->name,
1546                                         current->comm, u);
1547                                 status = -EBUSY;
1548                                 break;
1549                         }
1550                 }
1551         }
1552
1553         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1554          * so avoid usb_set_configuration()'s kick to sysfs
1555          */
1556         if (status == 0) {
1557                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1558                         status = usb_reset_configuration(ps->dev);
1559                 else
1560                         status = usb_set_configuration(ps->dev, u);
1561         }
1562
1563         return status;
1564 }
1565
1566 static struct usb_memory *
1567 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1568 {
1569         struct usb_memory *usbm = NULL, *iter;
1570         unsigned long flags;
1571         unsigned long uurb_start = (unsigned long)uurb->buffer;
1572
1573         spin_lock_irqsave(&ps->lock, flags);
1574         list_for_each_entry(iter, &ps->memory_list, memlist) {
1575                 if (uurb_start >= iter->vm_start &&
1576                                 uurb_start < iter->vm_start + iter->size) {
1577                         if (uurb->buffer_length > iter->vm_start + iter->size -
1578                                         uurb_start) {
1579                                 usbm = ERR_PTR(-EINVAL);
1580                         } else {
1581                                 usbm = iter;
1582                                 usbm->urb_use_count++;
1583                         }
1584                         break;
1585                 }
1586         }
1587         spin_unlock_irqrestore(&ps->lock, flags);
1588         return usbm;
1589 }
1590
1591 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1592                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1593                         void __user *arg, sigval_t userurb_sigval)
1594 {
1595         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1596         struct usb_host_endpoint *ep;
1597         struct async *as = NULL;
1598         struct usb_ctrlrequest *dr = NULL;
1599         unsigned int u, totlen, isofrmlen;
1600         int i, ret, num_sgs = 0, ifnum = -1;
1601         int number_of_packets = 0;
1602         unsigned int stream_id = 0;
1603         void *buf;
1604         bool is_in;
1605         bool allow_short = false;
1606         bool allow_zero = false;
1607         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1608                                 USBDEVFS_URB_BULK_CONTINUATION |
1609                                 USBDEVFS_URB_NO_FSBR |
1610                                 USBDEVFS_URB_ZERO_PACKET |
1611                                 USBDEVFS_URB_NO_INTERRUPT;
1612         /* USBDEVFS_URB_ISO_ASAP is a special case */
1613         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1614                 mask |= USBDEVFS_URB_ISO_ASAP;
1615
1616         if (uurb->flags & ~mask)
1617                         return -EINVAL;
1618
1619         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1620                 return -EINVAL;
1621         if (uurb->buffer_length > 0 && !uurb->buffer)
1622                 return -EINVAL;
1623         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1624             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1625                 ifnum = findintfep(ps->dev, uurb->endpoint);
1626                 if (ifnum < 0)
1627                         return ifnum;
1628                 ret = checkintf(ps, ifnum);
1629                 if (ret)
1630                         return ret;
1631         }
1632         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1633         if (!ep)
1634                 return -ENOENT;
1635         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1636
1637         u = 0;
1638         switch (uurb->type) {
1639         case USBDEVFS_URB_TYPE_CONTROL:
1640                 if (!usb_endpoint_xfer_control(&ep->desc))
1641                         return -EINVAL;
1642                 /* min 8 byte setup packet */
1643                 if (uurb->buffer_length < 8)
1644                         return -EINVAL;
1645                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1646                 if (!dr)
1647                         return -ENOMEM;
1648                 if (copy_from_user(dr, uurb->buffer, 8)) {
1649                         ret = -EFAULT;
1650                         goto error;
1651                 }
1652                 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1653                         ret = -EINVAL;
1654                         goto error;
1655                 }
1656                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1657                                       le16_to_cpu(dr->wIndex));
1658                 if (ret)
1659                         goto error;
1660                 uurb->buffer_length = le16_to_cpu(dr->wLength);
1661                 uurb->buffer += 8;
1662                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1663                         is_in = true;
1664                         uurb->endpoint |= USB_DIR_IN;
1665                 } else {
1666                         is_in = false;
1667                         uurb->endpoint &= ~USB_DIR_IN;
1668                 }
1669                 if (is_in)
1670                         allow_short = true;
1671                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1672                         "bRequest=%02x wValue=%04x "
1673                         "wIndex=%04x wLength=%04x\n",
1674                         dr->bRequestType, dr->bRequest,
1675                         __le16_to_cpu(dr->wValue),
1676                         __le16_to_cpu(dr->wIndex),
1677                         __le16_to_cpu(dr->wLength));
1678                 u = sizeof(struct usb_ctrlrequest);
1679                 break;
1680
1681         case USBDEVFS_URB_TYPE_BULK:
1682                 if (!is_in)
1683                         allow_zero = true;
1684                 else
1685                         allow_short = true;
1686                 switch (usb_endpoint_type(&ep->desc)) {
1687                 case USB_ENDPOINT_XFER_CONTROL:
1688                 case USB_ENDPOINT_XFER_ISOC:
1689                         return -EINVAL;
1690                 case USB_ENDPOINT_XFER_INT:
1691                         /* allow single-shot interrupt transfers */
1692                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1693                         goto interrupt_urb;
1694                 }
1695                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1696                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1697                         num_sgs = 0;
1698                 if (ep->streams)
1699                         stream_id = uurb->stream_id;
1700                 break;
1701
1702         case USBDEVFS_URB_TYPE_INTERRUPT:
1703                 if (!usb_endpoint_xfer_int(&ep->desc))
1704                         return -EINVAL;
1705  interrupt_urb:
1706                 if (!is_in)
1707                         allow_zero = true;
1708                 else
1709                         allow_short = true;
1710                 break;
1711
1712         case USBDEVFS_URB_TYPE_ISO:
1713                 /* arbitrary limit */
1714                 if (uurb->number_of_packets < 1 ||
1715                     uurb->number_of_packets > 128)
1716                         return -EINVAL;
1717                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1718                         return -EINVAL;
1719                 number_of_packets = uurb->number_of_packets;
1720                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1721                                    number_of_packets;
1722                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1723                 if (IS_ERR(isopkt)) {
1724                         ret = PTR_ERR(isopkt);
1725                         isopkt = NULL;
1726                         goto error;
1727                 }
1728                 for (totlen = u = 0; u < number_of_packets; u++) {
1729                         /*
1730                          * arbitrary limit need for USB 3.1 Gen2
1731                          * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1732                          */
1733                         if (isopkt[u].length > 98304) {
1734                                 ret = -EINVAL;
1735                                 goto error;
1736                         }
1737                         totlen += isopkt[u].length;
1738                 }
1739                 u *= sizeof(struct usb_iso_packet_descriptor);
1740                 uurb->buffer_length = totlen;
1741                 break;
1742
1743         default:
1744                 return -EINVAL;
1745         }
1746
1747         if (uurb->buffer_length > 0 &&
1748                         !access_ok(uurb->buffer, uurb->buffer_length)) {
1749                 ret = -EFAULT;
1750                 goto error;
1751         }
1752         as = alloc_async(number_of_packets);
1753         if (!as) {
1754                 ret = -ENOMEM;
1755                 goto error;
1756         }
1757
1758         as->usbm = find_memory_area(ps, uurb);
1759         if (IS_ERR(as->usbm)) {
1760                 ret = PTR_ERR(as->usbm);
1761                 as->usbm = NULL;
1762                 goto error;
1763         }
1764
1765         /* do not use SG buffers when memory mapped segments
1766          * are in use
1767          */
1768         if (as->usbm)
1769                 num_sgs = 0;
1770
1771         u += sizeof(struct async) + sizeof(struct urb) +
1772              (as->usbm ? 0 : uurb->buffer_length) +
1773              num_sgs * sizeof(struct scatterlist);
1774         ret = usbfs_increase_memory_usage(u);
1775         if (ret)
1776                 goto error;
1777         as->mem_usage = u;
1778
1779         if (num_sgs) {
1780                 as->urb->sg = kmalloc_array(num_sgs,
1781                                             sizeof(struct scatterlist),
1782                                             GFP_KERNEL | __GFP_NOWARN);
1783                 if (!as->urb->sg) {
1784                         ret = -ENOMEM;
1785                         goto error;
1786                 }
1787                 as->urb->num_sgs = num_sgs;
1788                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1789
1790                 totlen = uurb->buffer_length;
1791                 for (i = 0; i < as->urb->num_sgs; i++) {
1792                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1793                         buf = kmalloc(u, GFP_KERNEL);
1794                         if (!buf) {
1795                                 ret = -ENOMEM;
1796                                 goto error;
1797                         }
1798                         sg_set_buf(&as->urb->sg[i], buf, u);
1799
1800                         if (!is_in) {
1801                                 if (copy_from_user(buf, uurb->buffer, u)) {
1802                                         ret = -EFAULT;
1803                                         goto error;
1804                                 }
1805                                 uurb->buffer += u;
1806                         }
1807                         totlen -= u;
1808                 }
1809         } else if (uurb->buffer_length > 0) {
1810                 if (as->usbm) {
1811                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1812
1813                         as->urb->transfer_buffer = as->usbm->mem +
1814                                         (uurb_start - as->usbm->vm_start);
1815                 } else {
1816                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1817                                         GFP_KERNEL | __GFP_NOWARN);
1818                         if (!as->urb->transfer_buffer) {
1819                                 ret = -ENOMEM;
1820                                 goto error;
1821                         }
1822                         if (!is_in) {
1823                                 if (copy_from_user(as->urb->transfer_buffer,
1824                                                    uurb->buffer,
1825                                                    uurb->buffer_length)) {
1826                                         ret = -EFAULT;
1827                                         goto error;
1828                                 }
1829                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1830                                 /*
1831                                  * Isochronous input data may end up being
1832                                  * discontiguous if some of the packets are
1833                                  * short. Clear the buffer so that the gaps
1834                                  * don't leak kernel data to userspace.
1835                                  */
1836                                 memset(as->urb->transfer_buffer, 0,
1837                                                 uurb->buffer_length);
1838                         }
1839                 }
1840         }
1841         as->urb->dev = ps->dev;
1842         as->urb->pipe = (uurb->type << 30) |
1843                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1844                         (uurb->endpoint & USB_DIR_IN);
1845
1846         /* This tedious sequence is necessary because the URB_* flags
1847          * are internal to the kernel and subject to change, whereas
1848          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1849          */
1850         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1851         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1852                 u |= URB_ISO_ASAP;
1853         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1854                 u |= URB_SHORT_NOT_OK;
1855         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1856                 u |= URB_ZERO_PACKET;
1857         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1858                 u |= URB_NO_INTERRUPT;
1859         as->urb->transfer_flags = u;
1860
1861         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1862                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1863         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1864                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1865
1866         as->urb->transfer_buffer_length = uurb->buffer_length;
1867         as->urb->setup_packet = (unsigned char *)dr;
1868         dr = NULL;
1869         as->urb->start_frame = uurb->start_frame;
1870         as->urb->number_of_packets = number_of_packets;
1871         as->urb->stream_id = stream_id;
1872
1873         if (ep->desc.bInterval) {
1874                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1875                                 ps->dev->speed == USB_SPEED_HIGH ||
1876                                 ps->dev->speed >= USB_SPEED_SUPER)
1877                         as->urb->interval = 1 <<
1878                                         min(15, ep->desc.bInterval - 1);
1879                 else
1880                         as->urb->interval = ep->desc.bInterval;
1881         }
1882
1883         as->urb->context = as;
1884         as->urb->complete = async_completed;
1885         for (totlen = u = 0; u < number_of_packets; u++) {
1886                 as->urb->iso_frame_desc[u].offset = totlen;
1887                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1888                 totlen += isopkt[u].length;
1889         }
1890         kfree(isopkt);
1891         isopkt = NULL;
1892         as->ps = ps;
1893         as->userurb = arg;
1894         as->userurb_sigval = userurb_sigval;
1895         if (as->usbm) {
1896                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1897
1898                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1899                 as->urb->transfer_dma = as->usbm->dma_handle +
1900                                 (uurb_start - as->usbm->vm_start);
1901         } else if (is_in && uurb->buffer_length > 0)
1902                 as->userbuffer = uurb->buffer;
1903         as->signr = uurb->signr;
1904         as->ifnum = ifnum;
1905         as->pid = get_pid(task_pid(current));
1906         as->cred = get_current_cred();
1907         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1908                         as->urb->transfer_buffer_length, 0, SUBMIT,
1909                         NULL, 0);
1910         if (!is_in)
1911                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1912
1913         async_newpending(as);
1914
1915         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1916                 spin_lock_irq(&ps->lock);
1917
1918                 /* Not exactly the endpoint address; the direction bit is
1919                  * shifted to the 0x10 position so that the value will be
1920                  * between 0 and 31.
1921                  */
1922                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1923                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1924                                 >> 3);
1925
1926                 /* If this bulk URB is the start of a new transfer, re-enable
1927                  * the endpoint.  Otherwise mark it as a continuation URB.
1928                  */
1929                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1930                         as->bulk_status = AS_CONTINUATION;
1931                 else
1932                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1933
1934                 /* Don't accept continuation URBs if the endpoint is
1935                  * disabled because of an earlier error.
1936                  */
1937                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1938                         ret = -EREMOTEIO;
1939                 else
1940                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1941                 spin_unlock_irq(&ps->lock);
1942         } else {
1943                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1944         }
1945
1946         if (ret) {
1947                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1948                            "usbfs: usb_submit_urb returned %d\n", ret);
1949                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1950                                 0, ret, COMPLETE, NULL, 0);
1951                 async_removepending(as);
1952                 goto error;
1953         }
1954         return 0;
1955
1956  error:
1957         kfree(isopkt);
1958         kfree(dr);
1959         if (as)
1960                 free_async(as);
1961         return ret;
1962 }
1963
1964 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1965 {
1966         struct usbdevfs_urb uurb;
1967         sigval_t userurb_sigval;
1968
1969         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1970                 return -EFAULT;
1971
1972         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1973         userurb_sigval.sival_ptr = arg;
1974
1975         return proc_do_submiturb(ps, &uurb,
1976                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1977                         arg, userurb_sigval);
1978 }
1979
1980 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1981 {
1982         struct urb *urb;
1983         struct async *as;
1984         unsigned long flags;
1985
1986         spin_lock_irqsave(&ps->lock, flags);
1987         as = async_getpending(ps, arg);
1988         if (!as) {
1989                 spin_unlock_irqrestore(&ps->lock, flags);
1990                 return -EINVAL;
1991         }
1992
1993         urb = as->urb;
1994         usb_get_urb(urb);
1995         spin_unlock_irqrestore(&ps->lock, flags);
1996
1997         usb_kill_urb(urb);
1998         usb_put_urb(urb);
1999
2000         return 0;
2001 }
2002
2003 static void compute_isochronous_actual_length(struct urb *urb)
2004 {
2005         unsigned int i;
2006
2007         if (urb->number_of_packets > 0) {
2008                 urb->actual_length = 0;
2009                 for (i = 0; i < urb->number_of_packets; i++)
2010                         urb->actual_length +=
2011                                         urb->iso_frame_desc[i].actual_length;
2012         }
2013 }
2014
2015 static int processcompl(struct async *as, void __user * __user *arg)
2016 {
2017         struct urb *urb = as->urb;
2018         struct usbdevfs_urb __user *userurb = as->userurb;
2019         void __user *addr = as->userurb;
2020         unsigned int i;
2021
2022         compute_isochronous_actual_length(urb);
2023         if (as->userbuffer && urb->actual_length) {
2024                 if (copy_urb_data_to_user(as->userbuffer, urb))
2025                         goto err_out;
2026         }
2027         if (put_user(as->status, &userurb->status))
2028                 goto err_out;
2029         if (put_user(urb->actual_length, &userurb->actual_length))
2030                 goto err_out;
2031         if (put_user(urb->error_count, &userurb->error_count))
2032                 goto err_out;
2033
2034         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2035                 for (i = 0; i < urb->number_of_packets; i++) {
2036                         if (put_user(urb->iso_frame_desc[i].actual_length,
2037                                      &userurb->iso_frame_desc[i].actual_length))
2038                                 goto err_out;
2039                         if (put_user(urb->iso_frame_desc[i].status,
2040                                      &userurb->iso_frame_desc[i].status))
2041                                 goto err_out;
2042                 }
2043         }
2044
2045         if (put_user(addr, (void __user * __user *)arg))
2046                 return -EFAULT;
2047         return 0;
2048
2049 err_out:
2050         return -EFAULT;
2051 }
2052
2053 static struct async *reap_as(struct usb_dev_state *ps)
2054 {
2055         DECLARE_WAITQUEUE(wait, current);
2056         struct async *as = NULL;
2057         struct usb_device *dev = ps->dev;
2058
2059         add_wait_queue(&ps->wait, &wait);
2060         for (;;) {
2061                 __set_current_state(TASK_INTERRUPTIBLE);
2062                 as = async_getcompleted(ps);
2063                 if (as || !connected(ps))
2064                         break;
2065                 if (signal_pending(current))
2066                         break;
2067                 usb_unlock_device(dev);
2068                 schedule();
2069                 usb_lock_device(dev);
2070         }
2071         remove_wait_queue(&ps->wait, &wait);
2072         set_current_state(TASK_RUNNING);
2073         return as;
2074 }
2075
2076 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2077 {
2078         struct async *as = reap_as(ps);
2079
2080         if (as) {
2081                 int retval;
2082
2083                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2084                 retval = processcompl(as, (void __user * __user *)arg);
2085                 free_async(as);
2086                 return retval;
2087         }
2088         if (signal_pending(current))
2089                 return -EINTR;
2090         return -ENODEV;
2091 }
2092
2093 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2094 {
2095         int retval;
2096         struct async *as;
2097
2098         as = async_getcompleted(ps);
2099         if (as) {
2100                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2101                 retval = processcompl(as, (void __user * __user *)arg);
2102                 free_async(as);
2103         } else {
2104                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2105         }
2106         return retval;
2107 }
2108
2109 #ifdef CONFIG_COMPAT
2110 static int proc_control_compat(struct usb_dev_state *ps,
2111                                 struct usbdevfs_ctrltransfer32 __user *p32)
2112 {
2113         struct usbdevfs_ctrltransfer ctrl;
2114         u32 udata;
2115
2116         if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2117             get_user(udata, &p32->data))
2118                 return -EFAULT;
2119         ctrl.data = compat_ptr(udata);
2120         return do_proc_control(ps, &ctrl);
2121 }
2122
2123 static int proc_bulk_compat(struct usb_dev_state *ps,
2124                         struct usbdevfs_bulktransfer32 __user *p32)
2125 {
2126         struct usbdevfs_bulktransfer bulk;
2127         compat_caddr_t addr;
2128
2129         if (get_user(bulk.ep, &p32->ep) ||
2130             get_user(bulk.len, &p32->len) ||
2131             get_user(bulk.timeout, &p32->timeout) ||
2132             get_user(addr, &p32->data))
2133                 return -EFAULT;
2134         bulk.data = compat_ptr(addr);
2135         return do_proc_bulk(ps, &bulk);
2136 }
2137
2138 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2139 {
2140         struct usbdevfs_disconnectsignal32 ds;
2141
2142         if (copy_from_user(&ds, arg, sizeof(ds)))
2143                 return -EFAULT;
2144         ps->discsignr = ds.signr;
2145         ps->disccontext.sival_int = ds.context;
2146         return 0;
2147 }
2148
2149 static int get_urb32(struct usbdevfs_urb *kurb,
2150                      struct usbdevfs_urb32 __user *uurb)
2151 {
2152         struct usbdevfs_urb32 urb32;
2153         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2154                 return -EFAULT;
2155         kurb->type = urb32.type;
2156         kurb->endpoint = urb32.endpoint;
2157         kurb->status = urb32.status;
2158         kurb->flags = urb32.flags;
2159         kurb->buffer = compat_ptr(urb32.buffer);
2160         kurb->buffer_length = urb32.buffer_length;
2161         kurb->actual_length = urb32.actual_length;
2162         kurb->start_frame = urb32.start_frame;
2163         kurb->number_of_packets = urb32.number_of_packets;
2164         kurb->error_count = urb32.error_count;
2165         kurb->signr = urb32.signr;
2166         kurb->usercontext = compat_ptr(urb32.usercontext);
2167         return 0;
2168 }
2169
2170 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2171 {
2172         struct usbdevfs_urb uurb;
2173         sigval_t userurb_sigval;
2174
2175         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2176                 return -EFAULT;
2177
2178         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2179         userurb_sigval.sival_int = ptr_to_compat(arg);
2180
2181         return proc_do_submiturb(ps, &uurb,
2182                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2183                         arg, userurb_sigval);
2184 }
2185
2186 static int processcompl_compat(struct async *as, void __user * __user *arg)
2187 {
2188         struct urb *urb = as->urb;
2189         struct usbdevfs_urb32 __user *userurb = as->userurb;
2190         void __user *addr = as->userurb;
2191         unsigned int i;
2192
2193         compute_isochronous_actual_length(urb);
2194         if (as->userbuffer && urb->actual_length) {
2195                 if (copy_urb_data_to_user(as->userbuffer, urb))
2196                         return -EFAULT;
2197         }
2198         if (put_user(as->status, &userurb->status))
2199                 return -EFAULT;
2200         if (put_user(urb->actual_length, &userurb->actual_length))
2201                 return -EFAULT;
2202         if (put_user(urb->error_count, &userurb->error_count))
2203                 return -EFAULT;
2204
2205         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2206                 for (i = 0; i < urb->number_of_packets; i++) {
2207                         if (put_user(urb->iso_frame_desc[i].actual_length,
2208                                      &userurb->iso_frame_desc[i].actual_length))
2209                                 return -EFAULT;
2210                         if (put_user(urb->iso_frame_desc[i].status,
2211                                      &userurb->iso_frame_desc[i].status))
2212                                 return -EFAULT;
2213                 }
2214         }
2215
2216         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2217                 return -EFAULT;
2218         return 0;
2219 }
2220
2221 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2222 {
2223         struct async *as = reap_as(ps);
2224
2225         if (as) {
2226                 int retval;
2227
2228                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2229                 retval = processcompl_compat(as, (void __user * __user *)arg);
2230                 free_async(as);
2231                 return retval;
2232         }
2233         if (signal_pending(current))
2234                 return -EINTR;
2235         return -ENODEV;
2236 }
2237
2238 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2239 {
2240         int retval;
2241         struct async *as;
2242
2243         as = async_getcompleted(ps);
2244         if (as) {
2245                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2246                 retval = processcompl_compat(as, (void __user * __user *)arg);
2247                 free_async(as);
2248         } else {
2249                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2250         }
2251         return retval;
2252 }
2253
2254
2255 #endif
2256
2257 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2258 {
2259         struct usbdevfs_disconnectsignal ds;
2260
2261         if (copy_from_user(&ds, arg, sizeof(ds)))
2262                 return -EFAULT;
2263         ps->discsignr = ds.signr;
2264         ps->disccontext.sival_ptr = ds.context;
2265         return 0;
2266 }
2267
2268 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2269 {
2270         unsigned int ifnum;
2271
2272         if (get_user(ifnum, (unsigned int __user *)arg))
2273                 return -EFAULT;
2274         return claimintf(ps, ifnum);
2275 }
2276
2277 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2278 {
2279         unsigned int ifnum;
2280         int ret;
2281
2282         if (get_user(ifnum, (unsigned int __user *)arg))
2283                 return -EFAULT;
2284         ret = releaseintf(ps, ifnum);
2285         if (ret < 0)
2286                 return ret;
2287         destroy_async_on_interface(ps, ifnum);
2288         return 0;
2289 }
2290
2291 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2292 {
2293         int                     size;
2294         void                    *buf = NULL;
2295         int                     retval = 0;
2296         struct usb_interface    *intf = NULL;
2297         struct usb_driver       *driver = NULL;
2298
2299         if (ps->privileges_dropped)
2300                 return -EACCES;
2301
2302         if (!connected(ps))
2303                 return -ENODEV;
2304
2305         /* alloc buffer */
2306         size = _IOC_SIZE(ctl->ioctl_code);
2307         if (size > 0) {
2308                 buf = kmalloc(size, GFP_KERNEL);
2309                 if (buf == NULL)
2310                         return -ENOMEM;
2311                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2312                         if (copy_from_user(buf, ctl->data, size)) {
2313                                 kfree(buf);
2314                                 return -EFAULT;
2315                         }
2316                 } else {
2317                         memset(buf, 0, size);
2318                 }
2319         }
2320
2321         if (ps->dev->state != USB_STATE_CONFIGURED)
2322                 retval = -EHOSTUNREACH;
2323         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2324                 retval = -EINVAL;
2325         else switch (ctl->ioctl_code) {
2326
2327         /* disconnect kernel driver from interface */
2328         case USBDEVFS_DISCONNECT:
2329                 if (intf->dev.driver) {
2330                         driver = to_usb_driver(intf->dev.driver);
2331                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2332                         usb_driver_release_interface(driver, intf);
2333                 } else
2334                         retval = -ENODATA;
2335                 break;
2336
2337         /* let kernel drivers try to (re)bind to the interface */
2338         case USBDEVFS_CONNECT:
2339                 if (!intf->dev.driver)
2340                         retval = device_attach(&intf->dev);
2341                 else
2342                         retval = -EBUSY;
2343                 break;
2344
2345         /* talk directly to the interface's driver */
2346         default:
2347                 if (intf->dev.driver)
2348                         driver = to_usb_driver(intf->dev.driver);
2349                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2350                         retval = -ENOTTY;
2351                 } else {
2352                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2353                         if (retval == -ENOIOCTLCMD)
2354                                 retval = -ENOTTY;
2355                 }
2356         }
2357
2358         /* cleanup and return */
2359         if (retval >= 0
2360                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2361                         && size > 0
2362                         && copy_to_user(ctl->data, buf, size) != 0)
2363                 retval = -EFAULT;
2364
2365         kfree(buf);
2366         return retval;
2367 }
2368
2369 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2370 {
2371         struct usbdevfs_ioctl   ctrl;
2372
2373         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2374                 return -EFAULT;
2375         return proc_ioctl(ps, &ctrl);
2376 }
2377
2378 #ifdef CONFIG_COMPAT
2379 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2380 {
2381         struct usbdevfs_ioctl32 ioc32;
2382         struct usbdevfs_ioctl ctrl;
2383
2384         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2385                 return -EFAULT;
2386         ctrl.ifno = ioc32.ifno;
2387         ctrl.ioctl_code = ioc32.ioctl_code;
2388         ctrl.data = compat_ptr(ioc32.data);
2389         return proc_ioctl(ps, &ctrl);
2390 }
2391 #endif
2392
2393 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2394 {
2395         unsigned portnum;
2396         int rc;
2397
2398         if (get_user(portnum, (unsigned __user *) arg))
2399                 return -EFAULT;
2400         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2401         if (rc == 0)
2402                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2403                         portnum, task_pid_nr(current), current->comm);
2404         return rc;
2405 }
2406
2407 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2408 {
2409         unsigned portnum;
2410
2411         if (get_user(portnum, (unsigned __user *) arg))
2412                 return -EFAULT;
2413         return usb_hub_release_port(ps->dev, portnum, ps);
2414 }
2415
2416 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2417 {
2418         __u32 caps;
2419
2420         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2421                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2422                         USBDEVFS_CAP_DROP_PRIVILEGES |
2423                         USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2424         if (!ps->dev->bus->no_stop_on_short)
2425                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2426         if (ps->dev->bus->sg_tablesize)
2427                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2428
2429         if (put_user(caps, (__u32 __user *)arg))
2430                 return -EFAULT;
2431
2432         return 0;
2433 }
2434
2435 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2436 {
2437         struct usbdevfs_disconnect_claim dc;
2438         struct usb_interface *intf;
2439
2440         if (copy_from_user(&dc, arg, sizeof(dc)))
2441                 return -EFAULT;
2442
2443         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2444         if (!intf)
2445                 return -EINVAL;
2446
2447         if (intf->dev.driver) {
2448                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2449
2450                 if (ps->privileges_dropped)
2451                         return -EACCES;
2452
2453                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2454                                 strncmp(dc.driver, intf->dev.driver->name,
2455                                         sizeof(dc.driver)) != 0)
2456                         return -EBUSY;
2457
2458                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2459                                 strncmp(dc.driver, intf->dev.driver->name,
2460                                         sizeof(dc.driver)) == 0)
2461                         return -EBUSY;
2462
2463                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2464                 usb_driver_release_interface(driver, intf);
2465         }
2466
2467         return claimintf(ps, dc.interface);
2468 }
2469
2470 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2471 {
2472         unsigned num_streams, num_eps;
2473         struct usb_host_endpoint **eps;
2474         struct usb_interface *intf;
2475         int r;
2476
2477         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2478                                    &eps, &intf);
2479         if (r)
2480                 return r;
2481
2482         destroy_async_on_interface(ps,
2483                                    intf->altsetting[0].desc.bInterfaceNumber);
2484
2485         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2486         kfree(eps);
2487         return r;
2488 }
2489
2490 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2491 {
2492         unsigned num_eps;
2493         struct usb_host_endpoint **eps;
2494         struct usb_interface *intf;
2495         int r;
2496
2497         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2498         if (r)
2499                 return r;
2500
2501         destroy_async_on_interface(ps,
2502                                    intf->altsetting[0].desc.bInterfaceNumber);
2503
2504         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2505         kfree(eps);
2506         return r;
2507 }
2508
2509 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2510 {
2511         u32 data;
2512
2513         if (copy_from_user(&data, arg, sizeof(data)))
2514                 return -EFAULT;
2515
2516         /* This is a one way operation. Once privileges are
2517          * dropped, you cannot regain them. You may however reissue
2518          * this ioctl to shrink the allowed interfaces mask.
2519          */
2520         ps->interface_allowed_mask &= data;
2521         ps->privileges_dropped = true;
2522
2523         return 0;
2524 }
2525
2526 static int proc_forbid_suspend(struct usb_dev_state *ps)
2527 {
2528         int ret = 0;
2529
2530         if (ps->suspend_allowed) {
2531                 ret = usb_autoresume_device(ps->dev);
2532                 if (ret == 0)
2533                         ps->suspend_allowed = false;
2534                 else if (ret != -ENODEV)
2535                         ret = -EIO;
2536         }
2537         return ret;
2538 }
2539
2540 static int proc_allow_suspend(struct usb_dev_state *ps)
2541 {
2542         if (!connected(ps))
2543                 return -ENODEV;
2544
2545         WRITE_ONCE(ps->not_yet_resumed, 1);
2546         if (!ps->suspend_allowed) {
2547                 usb_autosuspend_device(ps->dev);
2548                 ps->suspend_allowed = true;
2549         }
2550         return 0;
2551 }
2552
2553 static int proc_wait_for_resume(struct usb_dev_state *ps)
2554 {
2555         int ret;
2556
2557         usb_unlock_device(ps->dev);
2558         ret = wait_event_interruptible(ps->wait_for_resume,
2559                         READ_ONCE(ps->not_yet_resumed) == 0);
2560         usb_lock_device(ps->dev);
2561
2562         if (ret != 0)
2563                 return -EINTR;
2564         return proc_forbid_suspend(ps);
2565 }
2566
2567 /*
2568  * NOTE:  All requests here that have interface numbers as parameters
2569  * are assuming that somehow the configuration has been prevented from
2570  * changing.  But there's no mechanism to ensure that...
2571  */
2572 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2573                                 void __user *p)
2574 {
2575         struct usb_dev_state *ps = file->private_data;
2576         struct inode *inode = file_inode(file);
2577         struct usb_device *dev = ps->dev;
2578         int ret = -ENOTTY;
2579
2580         if (!(file->f_mode & FMODE_WRITE))
2581                 return -EPERM;
2582
2583         usb_lock_device(dev);
2584
2585         /* Reap operations are allowed even after disconnection */
2586         switch (cmd) {
2587         case USBDEVFS_REAPURB:
2588                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2589                 ret = proc_reapurb(ps, p);
2590                 goto done;
2591
2592         case USBDEVFS_REAPURBNDELAY:
2593                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2594                 ret = proc_reapurbnonblock(ps, p);
2595                 goto done;
2596
2597 #ifdef CONFIG_COMPAT
2598         case USBDEVFS_REAPURB32:
2599                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2600                 ret = proc_reapurb_compat(ps, p);
2601                 goto done;
2602
2603         case USBDEVFS_REAPURBNDELAY32:
2604                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2605                 ret = proc_reapurbnonblock_compat(ps, p);
2606                 goto done;
2607 #endif
2608         }
2609
2610         if (!connected(ps)) {
2611                 usb_unlock_device(dev);
2612                 return -ENODEV;
2613         }
2614
2615         switch (cmd) {
2616         case USBDEVFS_CONTROL:
2617                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2618                 ret = proc_control(ps, p);
2619                 if (ret >= 0)
2620                         inode->i_mtime = current_time(inode);
2621                 break;
2622
2623         case USBDEVFS_BULK:
2624                 snoop(&dev->dev, "%s: BULK\n", __func__);
2625                 ret = proc_bulk(ps, p);
2626                 if (ret >= 0)
2627                         inode->i_mtime = current_time(inode);
2628                 break;
2629
2630         case USBDEVFS_RESETEP:
2631                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2632                 ret = proc_resetep(ps, p);
2633                 if (ret >= 0)
2634                         inode->i_mtime = current_time(inode);
2635                 break;
2636
2637         case USBDEVFS_RESET:
2638                 snoop(&dev->dev, "%s: RESET\n", __func__);
2639                 ret = proc_resetdevice(ps);
2640                 break;
2641
2642         case USBDEVFS_CLEAR_HALT:
2643                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2644                 ret = proc_clearhalt(ps, p);
2645                 if (ret >= 0)
2646                         inode->i_mtime = current_time(inode);
2647                 break;
2648
2649         case USBDEVFS_GETDRIVER:
2650                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2651                 ret = proc_getdriver(ps, p);
2652                 break;
2653
2654         case USBDEVFS_CONNECTINFO:
2655                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2656                 ret = proc_connectinfo(ps, p);
2657                 break;
2658
2659         case USBDEVFS_SETINTERFACE:
2660                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2661                 ret = proc_setintf(ps, p);
2662                 break;
2663
2664         case USBDEVFS_SETCONFIGURATION:
2665                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2666                 ret = proc_setconfig(ps, p);
2667                 break;
2668
2669         case USBDEVFS_SUBMITURB:
2670                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2671                 ret = proc_submiturb(ps, p);
2672                 if (ret >= 0)
2673                         inode->i_mtime = current_time(inode);
2674                 break;
2675
2676 #ifdef CONFIG_COMPAT
2677         case USBDEVFS_CONTROL32:
2678                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2679                 ret = proc_control_compat(ps, p);
2680                 if (ret >= 0)
2681                         inode->i_mtime = current_time(inode);
2682                 break;
2683
2684         case USBDEVFS_BULK32:
2685                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2686                 ret = proc_bulk_compat(ps, p);
2687                 if (ret >= 0)
2688                         inode->i_mtime = current_time(inode);
2689                 break;
2690
2691         case USBDEVFS_DISCSIGNAL32:
2692                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2693                 ret = proc_disconnectsignal_compat(ps, p);
2694                 break;
2695
2696         case USBDEVFS_SUBMITURB32:
2697                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2698                 ret = proc_submiturb_compat(ps, p);
2699                 if (ret >= 0)
2700                         inode->i_mtime = current_time(inode);
2701                 break;
2702
2703         case USBDEVFS_IOCTL32:
2704                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2705                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2706                 break;
2707 #endif
2708
2709         case USBDEVFS_DISCARDURB:
2710                 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2711                 ret = proc_unlinkurb(ps, p);
2712                 break;
2713
2714         case USBDEVFS_DISCSIGNAL:
2715                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2716                 ret = proc_disconnectsignal(ps, p);
2717                 break;
2718
2719         case USBDEVFS_CLAIMINTERFACE:
2720                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2721                 ret = proc_claiminterface(ps, p);
2722                 break;
2723
2724         case USBDEVFS_RELEASEINTERFACE:
2725                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2726                 ret = proc_releaseinterface(ps, p);
2727                 break;
2728
2729         case USBDEVFS_IOCTL:
2730                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2731                 ret = proc_ioctl_default(ps, p);
2732                 break;
2733
2734         case USBDEVFS_CLAIM_PORT:
2735                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2736                 ret = proc_claim_port(ps, p);
2737                 break;
2738
2739         case USBDEVFS_RELEASE_PORT:
2740                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2741                 ret = proc_release_port(ps, p);
2742                 break;
2743         case USBDEVFS_GET_CAPABILITIES:
2744                 ret = proc_get_capabilities(ps, p);
2745                 break;
2746         case USBDEVFS_DISCONNECT_CLAIM:
2747                 ret = proc_disconnect_claim(ps, p);
2748                 break;
2749         case USBDEVFS_ALLOC_STREAMS:
2750                 ret = proc_alloc_streams(ps, p);
2751                 break;
2752         case USBDEVFS_FREE_STREAMS:
2753                 ret = proc_free_streams(ps, p);
2754                 break;
2755         case USBDEVFS_DROP_PRIVILEGES:
2756                 ret = proc_drop_privileges(ps, p);
2757                 break;
2758         case USBDEVFS_GET_SPEED:
2759                 ret = ps->dev->speed;
2760                 break;
2761         case USBDEVFS_FORBID_SUSPEND:
2762                 ret = proc_forbid_suspend(ps);
2763                 break;
2764         case USBDEVFS_ALLOW_SUSPEND:
2765                 ret = proc_allow_suspend(ps);
2766                 break;
2767         case USBDEVFS_WAIT_FOR_RESUME:
2768                 ret = proc_wait_for_resume(ps);
2769                 break;
2770         }
2771
2772         /* Handle variable-length commands */
2773         switch (cmd & ~IOCSIZE_MASK) {
2774         case USBDEVFS_CONNINFO_EX(0):
2775                 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2776                 break;
2777         }
2778
2779  done:
2780         usb_unlock_device(dev);
2781         if (ret >= 0)
2782                 inode->i_atime = current_time(inode);
2783         return ret;
2784 }
2785
2786 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2787                         unsigned long arg)
2788 {
2789         int ret;
2790
2791         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2792
2793         return ret;
2794 }
2795
2796 /* No kernel lock - fine */
2797 static __poll_t usbdev_poll(struct file *file,
2798                                 struct poll_table_struct *wait)
2799 {
2800         struct usb_dev_state *ps = file->private_data;
2801         __poll_t mask = 0;
2802
2803         poll_wait(file, &ps->wait, wait);
2804         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2805                 mask |= EPOLLOUT | EPOLLWRNORM;
2806         if (!connected(ps))
2807                 mask |= EPOLLHUP;
2808         if (list_empty(&ps->list))
2809                 mask |= EPOLLERR;
2810         return mask;
2811 }
2812
2813 const struct file_operations usbdev_file_operations = {
2814         .owner =          THIS_MODULE,
2815         .llseek =         no_seek_end_llseek,
2816         .read =           usbdev_read,
2817         .poll =           usbdev_poll,
2818         .unlocked_ioctl = usbdev_ioctl,
2819         .compat_ioctl =   compat_ptr_ioctl,
2820         .mmap =           usbdev_mmap,
2821         .open =           usbdev_open,
2822         .release =        usbdev_release,
2823 };
2824
2825 static void usbdev_remove(struct usb_device *udev)
2826 {
2827         struct usb_dev_state *ps;
2828
2829         /* Protect against simultaneous resume */
2830         mutex_lock(&usbfs_mutex);
2831         while (!list_empty(&udev->filelist)) {
2832                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2833                 destroy_all_async(ps);
2834                 wake_up_all(&ps->wait);
2835                 WRITE_ONCE(ps->not_yet_resumed, 0);
2836                 wake_up_all(&ps->wait_for_resume);
2837                 list_del_init(&ps->list);
2838                 if (ps->discsignr)
2839                         kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2840                                              ps->disc_pid, ps->cred);
2841         }
2842         mutex_unlock(&usbfs_mutex);
2843 }
2844
2845 static int usbdev_notify(struct notifier_block *self,
2846                                unsigned long action, void *dev)
2847 {
2848         switch (action) {
2849         case USB_DEVICE_ADD:
2850                 break;
2851         case USB_DEVICE_REMOVE:
2852                 usbdev_remove(dev);
2853                 break;
2854         }
2855         return NOTIFY_OK;
2856 }
2857
2858 static struct notifier_block usbdev_nb = {
2859         .notifier_call =        usbdev_notify,
2860 };
2861
2862 static struct cdev usb_device_cdev;
2863
2864 int __init usb_devio_init(void)
2865 {
2866         int retval;
2867
2868         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2869                                         "usb_device");
2870         if (retval) {
2871                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2872                 goto out;
2873         }
2874         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2875         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2876         if (retval) {
2877                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2878                        USB_DEVICE_MAJOR);
2879                 goto error_cdev;
2880         }
2881         usb_register_notify(&usbdev_nb);
2882 out:
2883         return retval;
2884
2885 error_cdev:
2886         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2887         goto out;
2888 }
2889
2890 void usb_devio_cleanup(void)
2891 {
2892         usb_unregister_notify(&usbdev_nb);
2893         cdev_del(&usb_device_cdev);
2894         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2895 }