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/cdev.h>
  36 #include <linux/notifier.h>
  37 #include <linux/security.h>
  38 #include <linux/user_namespace.h>
  39 #include <linux/scatterlist.h>
  40 #include <linux/uaccess.h>
  41 #include <linux/dma-mapping.h>
  42 #include <asm/byteorder.h>
  43 #include <linux/moduleparam.h>
  44
  45 #include "usb.h"
  46
  47 #ifdef CONFIG_PM
  48 #define MAYBE_CAP_SUSPEND       USBDEVFS_CAP_SUSPEND
  49 #else
  50 #define MAYBE_CAP_SUSPEND       0
  51 #endif
  52
  53 #define USB_MAXBUS                      64
  54 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  55 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  56
  57 /* Mutual exclusion for ps->list in resume vs. release and remove */
  58 static DEFINE_MUTEX(usbfs_mutex);
  59
  60 struct usb_dev_state {
  61         struct list_head list;      /* state list */
  62         struct usb_device *dev;
  63         struct file *file;
  64         spinlock_t lock;            /* protects the async urb lists */
  65         struct list_head async_pending;
  66         struct list_head async_completed;
  67         struct list_head memory_list;
  68         wait_queue_head_t wait;     /* wake up if a request completed */
  69         wait_queue_head_t wait_for_resume;   /* wake up upon runtime resume */
  70         unsigned int discsignr;
  71         struct pid *disc_pid;
  72         const struct cred *cred;
  73         sigval_t disccontext;
  74         unsigned long ifclaimed;
  75         u32 disabled_bulk_eps;
  76         unsigned long interface_allowed_mask;
  77         int not_yet_resumed;
  78         bool suspend_allowed;
  79         bool privileges_dropped;
  80 };
  81
  82 struct usb_memory {
  83         struct list_head memlist;
  84         int vma_use_count;
  85         int urb_use_count;
  86         u32 size;
  87         void *mem;
  88         dma_addr_t dma_handle;
  89         unsigned long vm_start;
  90         struct usb_dev_state *ps;
  91 };
  92
  93 struct async {
  94         struct list_head asynclist;
  95         struct usb_dev_state *ps;
  96         struct pid *pid;
  97         const struct cred *cred;
  98         unsigned int signr;
  99         unsigned int ifnum;
 100         void __user *userbuffer;
 101         void __user *userurb;
 102         sigval_t userurb_sigval;
 103         struct urb *urb;
 104         struct usb_memory *usbm;
 105         unsigned int mem_usage;
 106         int status;
 107         u8 bulk_addr;
 108         u8 bulk_status;
 109 };
 110
 111 static bool usbfs_snoop;
 112 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 113 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 114
 115 static unsigned usbfs_snoop_max = 65536;
 116 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 117 MODULE_PARM_DESC(usbfs_snoop_max,
 118                 "maximum number of bytes to print while snooping");
 119
 120 #define snoop(dev, format, arg...)                              \
 121         do {                                                    \
 122                 if (usbfs_snoop)                                \
 123                         dev_info(dev, format, ## arg);          \
 124         } while (0)
 125
 126 enum snoop_when {
 127         SUBMIT, COMPLETE
 128 };
 129
 130 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 131
 132 /* Limit on the total amount of memory we can allocate for transfers */
 133 static u32 usbfs_memory_mb = 16;
 134 module_param(usbfs_memory_mb, uint, 0644);
 135 MODULE_PARM_DESC(usbfs_memory_mb,
 136                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 137
 138 /* Hard limit, necessary to avoid arithmetic overflow */
 139 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 140
 141 static atomic64_t usbfs_memory_usage;   /* Total memory currently allocated */
 142
 143 /* Check whether it's okay to allocate more memory for a transfer */
 144 static int usbfs_increase_memory_usage(u64 amount)
 145 {
 146         u64 lim;
 147
 148         lim = READ_ONCE(usbfs_memory_mb);
 149         lim <<= 20;
 150
 151         atomic64_add(amount, &usbfs_memory_usage);
 152
 153         if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
 154                 atomic64_sub(amount, &usbfs_memory_usage);
 155                 return -ENOMEM;
 156         }
 157
 158         return 0;
 159 }
 160
 161 /* Memory for a transfer is being deallocated */
 162 static void usbfs_decrease_memory_usage(u64 amount)
 163 {
 164         atomic64_sub(amount, &usbfs_memory_usage);
 165 }
 166
 167 static int connected(struct usb_dev_state *ps)
 168 {
 169         return (!list_empty(&ps->list) &&
 170                         ps->dev->state != USB_STATE_NOTATTACHED);
 171 }
 172
 173 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 174 {
 175         struct usb_dev_state *ps = usbm->ps;
 176         unsigned long flags;
 177
 178         spin_lock_irqsave(&ps->lock, flags);
 179         --*count;
 180         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 181                 list_del(&usbm->memlist);
 182                 spin_unlock_irqrestore(&ps->lock, flags);
 183
 184                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 185                                 usbm->dma_handle);
 186                 usbfs_decrease_memory_usage(
 187                         usbm->size + sizeof(struct usb_memory));
 188                 kfree(usbm);
 189         } else {
 190                 spin_unlock_irqrestore(&ps->lock, flags);
 191         }
 192 }
 193
 194 static void usbdev_vm_open(struct vm_area_struct *vma)
 195 {
 196         struct usb_memory *usbm = vma->vm_private_data;
 197         unsigned long flags;
 198
 199         spin_lock_irqsave(&usbm->ps->lock, flags);
 200         ++usbm->vma_use_count;
 201         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 202 }
 203
 204 static void usbdev_vm_close(struct vm_area_struct *vma)
 205 {
 206         struct usb_memory *usbm = vma->vm_private_data;
 207
 208         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 209 }
 210
 211 static const struct vm_operations_struct usbdev_vm_ops = {
 212         .open = usbdev_vm_open,
 213         .close = usbdev_vm_close
 214 };
 215
 216 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 217 {
 218         struct usb_memory *usbm = NULL;
 219         struct usb_dev_state *ps = file->private_data;
 220         struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
 221         size_t size = vma->vm_end - vma->vm_start;
 222         void *mem;
 223         unsigned long flags;
 224         dma_addr_t dma_handle;
 225         int ret;
 226
 227         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 228         if (ret)
 229                 goto error;
 230
 231         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 232         if (!usbm) {
 233                 ret = -ENOMEM;
 234                 goto error_decrease_mem;
 235         }
 236
 237         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 238                         &dma_handle);
 239         if (!mem) {
 240                 ret = -ENOMEM;
 241                 goto error_free_usbm;
 242         }
 243
 244         memset(mem, 0, size);
 245
 246         usbm->mem = mem;
 247         usbm->dma_handle = dma_handle;
 248         usbm->size = size;
 249         usbm->ps = ps;
 250         usbm->vm_start = vma->vm_start;
 251         usbm->vma_use_count = 1;
 252         INIT_LIST_HEAD(&usbm->memlist);
 253
 254         if (hcd->localmem_pool || !hcd_uses_dma(hcd)) {
 255                 if (remap_pfn_range(vma, vma->vm_start,
 256                                     virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 257                                     size, vma->vm_page_prot) < 0) {
 258                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 259                         return -EAGAIN;
 260                 }
 261         } else {
 262                 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
 263                                       size)) {
 264                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 265                         return -EAGAIN;
 266                 }
 267         }
 268
 269         vma->vm_flags |= VM_IO;
 270         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 271         vma->vm_ops = &usbdev_vm_ops;
 272         vma->vm_private_data = usbm;
 273
 274         spin_lock_irqsave(&ps->lock, flags);
 275         list_add_tail(&usbm->memlist, &ps->memory_list);
 276         spin_unlock_irqrestore(&ps->lock, flags);
 277
 278         return 0;
 279
 280 error_free_usbm:
 281         kfree(usbm);
 282 error_decrease_mem:
 283         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 284 error:
 285         return ret;
 286 }
 287
 288 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 289                            loff_t *ppos)
 290 {
 291         struct usb_dev_state *ps = file->private_data;
 292         struct usb_device *dev = ps->dev;
 293         ssize_t ret = 0;
 294         unsigned len;
 295         loff_t pos;
 296         int i;
 297
 298         pos = *ppos;
 299         usb_lock_device(dev);
 300         if (!connected(ps)) {
 301                 ret = -ENODEV;
 302                 goto err;
 303         } else if (pos < 0) {
 304                 ret = -EINVAL;
 305                 goto err;
 306         }
 307
 308         if (pos < sizeof(struct usb_device_descriptor)) {
 309                 /* 18 bytes - fits on the stack */
 310                 struct usb_device_descriptor temp_desc;
 311
 312                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 313                 le16_to_cpus(&temp_desc.bcdUSB);
 314                 le16_to_cpus(&temp_desc.idVendor);
 315                 le16_to_cpus(&temp_desc.idProduct);
 316                 le16_to_cpus(&temp_desc.bcdDevice);
 317
 318                 len = sizeof(struct usb_device_descriptor) - pos;
 319                 if (len > nbytes)
 320                         len = nbytes;
 321                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 322                         ret = -EFAULT;
 323                         goto err;
 324                 }
 325
 326                 *ppos += len;
 327                 buf += len;
 328                 nbytes -= len;
 329                 ret += len;
 330         }
 331
 332         pos = sizeof(struct usb_device_descriptor);
 333         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 334                 struct usb_config_descriptor *config =
 335                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 336                 unsigned int length = le16_to_cpu(config->wTotalLength);
 337
 338                 if (*ppos < pos + length) {
 339
 340                         /* The descriptor may claim to be longer than it
 341                          * really is.  Here is the actual allocated length. */
 342                         unsigned alloclen =
 343                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 344
 345                         len = length - (*ppos - pos);
 346                         if (len > nbytes)
 347                                 len = nbytes;
 348
 349                         /* Simply don't write (skip over) unallocated parts */
 350                         if (alloclen > (*ppos - pos)) {
 351                                 alloclen -= (*ppos - pos);
 352                                 if (copy_to_user(buf,
 353                                     dev->rawdescriptors[i] + (*ppos - pos),
 354                                     min(len, alloclen))) {
 355                                         ret = -EFAULT;
 356                                         goto err;
 357                                 }
 358                         }
 359
 360                         *ppos += len;
 361                         buf += len;
 362                         nbytes -= len;
 363                         ret += len;
 364                 }
 365
 366                 pos += length;
 367         }
 368
 369 err:
 370         usb_unlock_device(dev);
 371         return ret;
 372 }
 373
 374 /*
 375  * async list handling
 376  */
 377
 378 static struct async *alloc_async(unsigned int numisoframes)
 379 {
 380         struct async *as;
 381
 382         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 383         if (!as)
 384                 return NULL;
 385         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 386         if (!as->urb) {
 387                 kfree(as);
 388                 return NULL;
 389         }
 390         return as;
 391 }
 392
 393 static void free_async(struct async *as)
 394 {
 395         int i;
 396
 397         put_pid(as->pid);
 398         if (as->cred)
 399                 put_cred(as->cred);
 400         for (i = 0; i < as->urb->num_sgs; i++) {
 401                 if (sg_page(&as->urb->sg[i]))
 402                         kfree(sg_virt(&as->urb->sg[i]));
 403         }
 404
 405         kfree(as->urb->sg);
 406         if (as->usbm == NULL)
 407                 kfree(as->urb->transfer_buffer);
 408         else
 409                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 410
 411         kfree(as->urb->setup_packet);
 412         usb_free_urb(as->urb);
 413         usbfs_decrease_memory_usage(as->mem_usage);
 414         kfree(as);
 415 }
 416
 417 static void async_newpending(struct async *as)
 418 {
 419         struct usb_dev_state *ps = as->ps;
 420         unsigned long flags;
 421
 422         spin_lock_irqsave(&ps->lock, flags);
 423         list_add_tail(&as->asynclist, &ps->async_pending);
 424         spin_unlock_irqrestore(&ps->lock, flags);
 425 }
 426
 427 static void async_removepending(struct async *as)
 428 {
 429         struct usb_dev_state *ps = as->ps;
 430         unsigned long flags;
 431
 432         spin_lock_irqsave(&ps->lock, flags);
 433         list_del_init(&as->asynclist);
 434         spin_unlock_irqrestore(&ps->lock, flags);
 435 }
 436
 437 static struct async *async_getcompleted(struct usb_dev_state *ps)
 438 {
 439         unsigned long flags;
 440         struct async *as = NULL;
 441
 442         spin_lock_irqsave(&ps->lock, flags);
 443         if (!list_empty(&ps->async_completed)) {
 444                 as = list_entry(ps->async_completed.next, struct async,
 445                                 asynclist);
 446                 list_del_init(&as->asynclist);
 447         }
 448         spin_unlock_irqrestore(&ps->lock, flags);
 449         return as;
 450 }
 451
 452 static struct async *async_getpending(struct usb_dev_state *ps,
 453                                              void __user *userurb)
 454 {
 455         struct async *as;
 456
 457         list_for_each_entry(as, &ps->async_pending, asynclist)
 458                 if (as->userurb == userurb) {
 459                         list_del_init(&as->asynclist);
 460                         return as;
 461                 }
 462
 463         return NULL;
 464 }
 465
 466 static void snoop_urb(struct usb_device *udev,
 467                 void __user *userurb, int pipe, unsigned length,
 468                 int timeout_or_status, enum snoop_when when,
 469                 unsigned char *data, unsigned data_len)
 470 {
 471         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 472         static const char *dirs[] = {"out", "in"};
 473         int ep;
 474         const char *t, *d;
 475
 476         if (!usbfs_snoop)
 477                 return;
 478
 479         ep = usb_pipeendpoint(pipe);
 480         t = types[usb_pipetype(pipe)];
 481         d = dirs[!!usb_pipein(pipe)];
 482
 483         if (userurb) {          /* Async */
 484                 if (when == SUBMIT)
 485                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 486                                         "length %u\n",
 487                                         userurb, ep, t, d, length);
 488                 else
 489                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 490                                         "actual_length %u status %d\n",
 491                                         userurb, ep, t, d, length,
 492                                         timeout_or_status);
 493         } else {
 494                 if (when == SUBMIT)
 495                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 496                                         "timeout %d\n",
 497                                         ep, t, d, length, timeout_or_status);
 498                 else
 499                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 500                                         "status %d\n",
 501                                         ep, t, d, length, timeout_or_status);
 502         }
 503
 504         data_len = min(data_len, usbfs_snoop_max);
 505         if (data && data_len > 0) {
 506                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 507                         data, data_len, 1);
 508         }
 509 }
 510
 511 static void snoop_urb_data(struct urb *urb, unsigned len)
 512 {
 513         int i, size;
 514
 515         len = min(len, usbfs_snoop_max);
 516         if (!usbfs_snoop || len == 0)
 517                 return;
 518
 519         if (urb->num_sgs == 0) {
 520                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 521                         urb->transfer_buffer, len, 1);
 522                 return;
 523         }
 524
 525         for (i = 0; i < urb->num_sgs && len; i++) {
 526                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 527                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 528                         sg_virt(&urb->sg[i]), size, 1);
 529                 len -= size;
 530         }
 531 }
 532
 533 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 534 {
 535         unsigned i, len, size;
 536
 537         if (urb->number_of_packets > 0)         /* Isochronous */
 538                 len = urb->transfer_buffer_length;
 539         else                                    /* Non-Isoc */
 540                 len = urb->actual_length;
 541
 542         if (urb->num_sgs == 0) {
 543                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 544                         return -EFAULT;
 545                 return 0;
 546         }
 547
 548         for (i = 0; i < urb->num_sgs && len; i++) {
 549                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 550                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 551                         return -EFAULT;
 552                 userbuffer += size;
 553                 len -= size;
 554         }
 555
 556         return 0;
 557 }
 558
 559 #define AS_CONTINUATION 1
 560 #define AS_UNLINK       2
 561
 562 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 563 __releases(ps->lock)
 564 __acquires(ps->lock)
 565 {
 566         struct urb *urb;
 567         struct async *as;
 568
 569         /* Mark all the pending URBs that match bulk_addr, up to but not
 570          * including the first one without AS_CONTINUATION.  If such an
 571          * URB is encountered then a new transfer has already started so
 572          * the endpoint doesn't need to be disabled; otherwise it does.
 573          */
 574         list_for_each_entry(as, &ps->async_pending, asynclist) {
 575                 if (as->bulk_addr == bulk_addr) {
 576                         if (as->bulk_status != AS_CONTINUATION)
 577                                 goto rescan;
 578                         as->bulk_status = AS_UNLINK;
 579                         as->bulk_addr = 0;
 580                 }
 581         }
 582         ps->disabled_bulk_eps |= (1 << bulk_addr);
 583
 584         /* Now carefully unlink all the marked pending URBs */
 585  rescan:
 586         list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
 587                 if (as->bulk_status == AS_UNLINK) {
 588                         as->bulk_status = 0;            /* Only once */
 589                         urb = as->urb;
 590                         usb_get_urb(urb);
 591                         spin_unlock(&ps->lock);         /* Allow completions */
 592                         usb_unlink_urb(urb);
 593                         usb_put_urb(urb);
 594                         spin_lock(&ps->lock);
 595                         goto rescan;
 596                 }
 597         }
 598 }
 599
 600 static void async_completed(struct urb *urb)
 601 {
 602         struct async *as = urb->context;
 603         struct usb_dev_state *ps = as->ps;
 604         struct pid *pid = NULL;
 605         const struct cred *cred = NULL;
 606         unsigned long flags;
 607         sigval_t addr;
 608         int signr, errno;
 609
 610         spin_lock_irqsave(&ps->lock, flags);
 611         list_move_tail(&as->asynclist, &ps->async_completed);
 612         as->status = urb->status;
 613         signr = as->signr;
 614         if (signr) {
 615                 errno = as->status;
 616                 addr = as->userurb_sigval;
 617                 pid = get_pid(as->pid);
 618                 cred = get_cred(as->cred);
 619         }
 620         snoop(&urb->dev->dev, "urb complete\n");
 621         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 622                         as->status, COMPLETE, NULL, 0);
 623         if (usb_urb_dir_in(urb))
 624                 snoop_urb_data(urb, urb->actual_length);
 625
 626         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 627                         as->status != -ENOENT)
 628                 cancel_bulk_urbs(ps, as->bulk_addr);
 629
 630         wake_up(&ps->wait);
 631         spin_unlock_irqrestore(&ps->lock, flags);
 632
 633         if (signr) {
 634                 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
 635                 put_pid(pid);
 636                 put_cred(cred);
 637         }
 638 }
 639
 640 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 641 {
 642         struct urb *urb;
 643         struct async *as;
 644         unsigned long flags;
 645
 646         spin_lock_irqsave(&ps->lock, flags);
 647         while (!list_empty(list)) {
 648                 as = list_last_entry(list, struct async, asynclist);
 649                 list_del_init(&as->asynclist);
 650                 urb = as->urb;
 651                 usb_get_urb(urb);
 652
 653                 /* drop the spinlock so the completion handler can run */
 654                 spin_unlock_irqrestore(&ps->lock, flags);
 655                 usb_kill_urb(urb);
 656                 usb_put_urb(urb);
 657                 spin_lock_irqsave(&ps->lock, flags);
 658         }
 659         spin_unlock_irqrestore(&ps->lock, flags);
 660 }
 661
 662 static void destroy_async_on_interface(struct usb_dev_state *ps,
 663                                        unsigned int ifnum)
 664 {
 665         struct list_head *p, *q, hitlist;
 666         unsigned long flags;
 667
 668         INIT_LIST_HEAD(&hitlist);
 669         spin_lock_irqsave(&ps->lock, flags);
 670         list_for_each_safe(p, q, &ps->async_pending)
 671                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 672                         list_move_tail(p, &hitlist);
 673         spin_unlock_irqrestore(&ps->lock, flags);
 674         destroy_async(ps, &hitlist);
 675 }
 676
 677 static void destroy_all_async(struct usb_dev_state *ps)
 678 {
 679         destroy_async(ps, &ps->async_pending);
 680 }
 681
 682 /*
 683  * interface claims are made only at the request of user level code,
 684  * which can also release them (explicitly or by closing files).
 685  * they're also undone when devices disconnect.
 686  */
 687
 688 static int driver_probe(struct usb_interface *intf,
 689                         const struct usb_device_id *id)
 690 {
 691         return -ENODEV;
 692 }
 693
 694 static void driver_disconnect(struct usb_interface *intf)
 695 {
 696         struct usb_dev_state *ps = usb_get_intfdata(intf);
 697         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 698
 699         if (!ps)
 700                 return;
 701
 702         /* NOTE:  this relies on usbcore having canceled and completed
 703          * all pending I/O requests; 2.6 does that.
 704          */
 705
 706         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 707                 clear_bit(ifnum, &ps->ifclaimed);
 708         else
 709                 dev_warn(&intf->dev, "interface number %u out of range\n",
 710                          ifnum);
 711
 712         usb_set_intfdata(intf, NULL);
 713
 714         /* force async requests to complete */
 715         destroy_async_on_interface(ps, ifnum);
 716 }
 717
 718 /* We don't care about suspend/resume of claimed interfaces */
 719 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 720 {
 721         return 0;
 722 }
 723
 724 static int driver_resume(struct usb_interface *intf)
 725 {
 726         return 0;
 727 }
 728
 729 /* The following routines apply to the entire device, not interfaces */
 730 void usbfs_notify_suspend(struct usb_device *udev)
 731 {
 732         /* We don't need to handle this */
 733 }
 734
 735 void usbfs_notify_resume(struct usb_device *udev)
 736 {
 737         struct usb_dev_state *ps;
 738
 739         /* Protect against simultaneous remove or release */
 740         mutex_lock(&usbfs_mutex);
 741         list_for_each_entry(ps, &udev->filelist, list) {
 742                 WRITE_ONCE(ps->not_yet_resumed, 0);
 743                 wake_up_all(&ps->wait_for_resume);
 744         }
 745         mutex_unlock(&usbfs_mutex);
 746 }
 747
 748 struct usb_driver usbfs_driver = {
 749         .name =         "usbfs",
 750         .probe =        driver_probe,
 751         .disconnect =   driver_disconnect,
 752         .suspend =      driver_suspend,
 753         .resume =       driver_resume,
 754         .supports_autosuspend = 1,
 755 };
 756
 757 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 758 {
 759         struct usb_device *dev = ps->dev;
 760         struct usb_interface *intf;
 761         int err;
 762
 763         if (ifnum >= 8*sizeof(ps->ifclaimed))
 764                 return -EINVAL;
 765         /* already claimed */
 766         if (test_bit(ifnum, &ps->ifclaimed))
 767                 return 0;
 768
 769         if (ps->privileges_dropped &&
 770                         !test_bit(ifnum, &ps->interface_allowed_mask))
 771                 return -EACCES;
 772
 773         intf = usb_ifnum_to_if(dev, ifnum);
 774         if (!intf)
 775                 err = -ENOENT;
 776         else {
 777                 unsigned int old_suppress;
 778
 779                 /* suppress uevents while claiming interface */
 780                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 781                 dev_set_uevent_suppress(&intf->dev, 1);
 782                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 783                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 784         }
 785         if (err == 0)
 786                 set_bit(ifnum, &ps->ifclaimed);
 787         return err;
 788 }
 789
 790 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 791 {
 792         struct usb_device *dev;
 793         struct usb_interface *intf;
 794         int err;
 795
 796         err = -EINVAL;
 797         if (ifnum >= 8*sizeof(ps->ifclaimed))
 798                 return err;
 799         dev = ps->dev;
 800         intf = usb_ifnum_to_if(dev, ifnum);
 801         if (!intf)
 802                 err = -ENOENT;
 803         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 804                 unsigned int old_suppress;
 805
 806                 /* suppress uevents while releasing interface */
 807                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 808                 dev_set_uevent_suppress(&intf->dev, 1);
 809                 usb_driver_release_interface(&usbfs_driver, intf);
 810                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 811                 err = 0;
 812         }
 813         return err;
 814 }
 815
 816 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 817 {
 818         if (ps->dev->state != USB_STATE_CONFIGURED)
 819                 return -EHOSTUNREACH;
 820         if (ifnum >= 8*sizeof(ps->ifclaimed))
 821                 return -EINVAL;
 822         if (test_bit(ifnum, &ps->ifclaimed))
 823                 return 0;
 824         /* if not yet claimed, claim it for the driver */
 825         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 826                  "interface %u before use\n", task_pid_nr(current),
 827                  current->comm, ifnum);
 828         return claimintf(ps, ifnum);
 829 }
 830
 831 static int findintfep(struct usb_device *dev, unsigned int ep)
 832 {
 833         unsigned int i, j, e;
 834         struct usb_interface *intf;
 835         struct usb_host_interface *alts;
 836         struct usb_endpoint_descriptor *endpt;
 837
 838         if (ep & ~(USB_DIR_IN|0xf))
 839                 return -EINVAL;
 840         if (!dev->actconfig)
 841                 return -ESRCH;
 842         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 843                 intf = dev->actconfig->interface[i];
 844                 for (j = 0; j < intf->num_altsetting; j++) {
 845                         alts = &intf->altsetting[j];
 846                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 847                                 endpt = &alts->endpoint[e].desc;
 848                                 if (endpt->bEndpointAddress == ep)
 849                                         return alts->desc.bInterfaceNumber;
 850                         }
 851                 }
 852         }
 853         return -ENOENT;
 854 }
 855
 856 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 857                            unsigned int request, unsigned int index)
 858 {
 859         int ret = 0;
 860         struct usb_host_interface *alt_setting;
 861
 862         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 863          && ps->dev->state != USB_STATE_ADDRESS
 864          && ps->dev->state != USB_STATE_CONFIGURED)
 865                 return -EHOSTUNREACH;
 866         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 867                 return 0;
 868
 869         /*
 870          * check for the special corner case 'get_device_id' in the printer
 871          * class specification, which we always want to allow as it is used
 872          * to query things like ink level, etc.
 873          */
 874         if (requesttype == 0xa1 && request == 0) {
 875                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 876                                                    index >> 8, index & 0xff);
 877                 if (alt_setting
 878                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 879                         return 0;
 880         }
 881
 882         index &= 0xff;
 883         switch (requesttype & USB_RECIP_MASK) {
 884         case USB_RECIP_ENDPOINT:
 885                 if ((index & ~USB_DIR_IN) == 0)
 886                         return 0;
 887                 ret = findintfep(ps->dev, index);
 888                 if (ret < 0) {
 889                         /*
 890                          * Some not fully compliant Win apps seem to get
 891                          * index wrong and have the endpoint number here
 892                          * rather than the endpoint address (with the
 893                          * correct direction). Win does let this through,
 894                          * so we'll not reject it here but leave it to
 895                          * the device to not break KVM. But we warn.
 896                          */
 897                         ret = findintfep(ps->dev, index ^ 0x80);
 898                         if (ret >= 0)
 899                                 dev_info(&ps->dev->dev,
 900                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 901                                         __func__, task_pid_nr(current),
 902                                         current->comm, index, index ^ 0x80);
 903                 }
 904                 if (ret >= 0)
 905                         ret = checkintf(ps, ret);
 906                 break;
 907
 908         case USB_RECIP_INTERFACE:
 909                 ret = checkintf(ps, index);
 910                 break;
 911         }
 912         return ret;
 913 }
 914
 915 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 916                                                      unsigned char ep)
 917 {
 918         if (ep & USB_ENDPOINT_DIR_MASK)
 919                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 920         else
 921                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 922 }
 923
 924 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 925                                   struct usbdevfs_streams __user *streams,
 926                                   unsigned int *num_streams_ret,
 927                                   unsigned int *num_eps_ret,
 928                                   struct usb_host_endpoint ***eps_ret,
 929                                   struct usb_interface **intf_ret)
 930 {
 931         unsigned int i, num_streams, num_eps;
 932         struct usb_host_endpoint **eps;
 933         struct usb_interface *intf = NULL;
 934         unsigned char ep;
 935         int ifnum, ret;
 936
 937         if (get_user(num_streams, &streams->num_streams) ||
 938             get_user(num_eps, &streams->num_eps))
 939                 return -EFAULT;
 940
 941         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 942                 return -EINVAL;
 943
 944         /* The XHCI controller allows max 2 ^ 16 streams */
 945         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 946                 return -EINVAL;
 947
 948         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 949         if (!eps)
 950                 return -ENOMEM;
 951
 952         for (i = 0; i < num_eps; i++) {
 953                 if (get_user(ep, &streams->eps[i])) {
 954                         ret = -EFAULT;
 955                         goto error;
 956                 }
 957                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 958                 if (!eps[i]) {
 959                         ret = -EINVAL;
 960                         goto error;
 961                 }
 962
 963                 /* usb_alloc/free_streams operate on an usb_interface */
 964                 ifnum = findintfep(ps->dev, ep);
 965                 if (ifnum < 0) {
 966                         ret = ifnum;
 967                         goto error;
 968                 }
 969
 970                 if (i == 0) {
 971                         ret = checkintf(ps, ifnum);
 972                         if (ret < 0)
 973                                 goto error;
 974                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 975                 } else {
 976                         /* Verify all eps belong to the same interface */
 977                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 978                                 ret = -EINVAL;
 979                                 goto error;
 980                         }
 981                 }
 982         }
 983
 984         if (num_streams_ret)
 985                 *num_streams_ret = num_streams;
 986         *num_eps_ret = num_eps;
 987         *eps_ret = eps;
 988         *intf_ret = intf;
 989
 990         return 0;
 991
 992 error:
 993         kfree(eps);
 994         return ret;
 995 }
 996
 997 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 998 {
 999         struct device *dev;
1000
1001         dev = bus_find_device_by_devt(&usb_bus_type, devt);
1002         if (!dev)
1003                 return NULL;
1004         return to_usb_device(dev);
1005 }
1006
1007 /*
1008  * file operations
1009  */
1010 static int usbdev_open(struct inode *inode, struct file *file)
1011 {
1012         struct usb_device *dev = NULL;
1013         struct usb_dev_state *ps;
1014         int ret;
1015
1016         ret = -ENOMEM;
1017         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1018         if (!ps)
1019                 goto out_free_ps;
1020
1021         ret = -ENODEV;
1022
1023         /* usbdev device-node */
1024         if (imajor(inode) == USB_DEVICE_MAJOR)
1025                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1026         if (!dev)
1027                 goto out_free_ps;
1028
1029         usb_lock_device(dev);
1030         if (dev->state == USB_STATE_NOTATTACHED)
1031                 goto out_unlock_device;
1032
1033         ret = usb_autoresume_device(dev);
1034         if (ret)
1035                 goto out_unlock_device;
1036
1037         ps->dev = dev;
1038         ps->file = file;
1039         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1040         spin_lock_init(&ps->lock);
1041         INIT_LIST_HEAD(&ps->list);
1042         INIT_LIST_HEAD(&ps->async_pending);
1043         INIT_LIST_HEAD(&ps->async_completed);
1044         INIT_LIST_HEAD(&ps->memory_list);
1045         init_waitqueue_head(&ps->wait);
1046         init_waitqueue_head(&ps->wait_for_resume);
1047         ps->disc_pid = get_pid(task_pid(current));
1048         ps->cred = get_current_cred();
1049         smp_wmb();
1050
1051         /* Can't race with resume; the device is already active */
1052         list_add_tail(&ps->list, &dev->filelist);
1053         file->private_data = ps;
1054         usb_unlock_device(dev);
1055         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1056                         current->comm);
1057         return ret;
1058
1059  out_unlock_device:
1060         usb_unlock_device(dev);
1061         usb_put_dev(dev);
1062  out_free_ps:
1063         kfree(ps);
1064         return ret;
1065 }
1066
1067 static int usbdev_release(struct inode *inode, struct file *file)
1068 {
1069         struct usb_dev_state *ps = file->private_data;
1070         struct usb_device *dev = ps->dev;
1071         unsigned int ifnum;
1072         struct async *as;
1073
1074         usb_lock_device(dev);
1075         usb_hub_release_all_ports(dev, ps);
1076
1077         /* Protect against simultaneous resume */
1078         mutex_lock(&usbfs_mutex);
1079         list_del_init(&ps->list);
1080         mutex_unlock(&usbfs_mutex);
1081
1082         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1083                         ifnum++) {
1084                 if (test_bit(ifnum, &ps->ifclaimed))
1085                         releaseintf(ps, ifnum);
1086         }
1087         destroy_all_async(ps);
1088         if (!ps->suspend_allowed)
1089                 usb_autosuspend_device(dev);
1090         usb_unlock_device(dev);
1091         usb_put_dev(dev);
1092         put_pid(ps->disc_pid);
1093         put_cred(ps->cred);
1094
1095         as = async_getcompleted(ps);
1096         while (as) {
1097                 free_async(as);
1098                 as = async_getcompleted(ps);
1099         }
1100
1101         kfree(ps);
1102         return 0;
1103 }
1104
1105 static int do_proc_control(struct usb_dev_state *ps,
1106                 struct usbdevfs_ctrltransfer *ctrl)
1107 {
1108         struct usb_device *dev = ps->dev;
1109         unsigned int tmo;
1110         unsigned char *tbuf;
1111         unsigned wLength;
1112         int i, pipe, ret;
1113
1114         ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1115                               ctrl->wIndex);
1116         if (ret)
1117                 return ret;
1118         wLength = ctrl->wLength;        /* To suppress 64k PAGE_SIZE warning */
1119         if (wLength > PAGE_SIZE)
1120                 return -EINVAL;
1121         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1122                         sizeof(struct usb_ctrlrequest));
1123         if (ret)
1124                 return ret;
1125         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1126         if (!tbuf) {
1127                 ret = -ENOMEM;
1128                 goto done;
1129         }
1130         tmo = ctrl->timeout;
1131         snoop(&dev->dev, "control urb: bRequestType=%02x "
1132                 "bRequest=%02x wValue=%04x "
1133                 "wIndex=%04x wLength=%04x\n",
1134                 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1135                 ctrl->wIndex, ctrl->wLength);
1136         if (ctrl->bRequestType & 0x80) {
1137                 pipe = usb_rcvctrlpipe(dev, 0);
1138                 snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT, NULL, 0);
1139
1140                 usb_unlock_device(dev);
1141                 i = usb_control_msg(dev, pipe, ctrl->bRequest,
1142                                     ctrl->bRequestType, ctrl->wValue, ctrl->wIndex,
1143                                     tbuf, ctrl->wLength, tmo);
1144                 usb_lock_device(dev);
1145                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1146                           tbuf, max(i, 0));
1147                 if ((i > 0) && ctrl->wLength) {
1148                         if (copy_to_user(ctrl->data, tbuf, i)) {
1149                                 ret = -EFAULT;
1150                                 goto done;
1151                         }
1152                 }
1153         } else {
1154                 if (ctrl->wLength) {
1155                         if (copy_from_user(tbuf, ctrl->data, ctrl->wLength)) {
1156                                 ret = -EFAULT;
1157                                 goto done;
1158                         }
1159                 }
1160                 pipe = usb_sndctrlpipe(dev, 0);
1161                 snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT,
1162                         tbuf, ctrl->wLength);
1163
1164                 usb_unlock_device(dev);
1165                 i = usb_control_msg(dev, pipe, ctrl->bRequest,
1166                                     ctrl->bRequestType, ctrl->wValue, ctrl->wIndex,
1167                                     tbuf, ctrl->wLength, tmo);
1168                 usb_lock_device(dev);
1169                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1170         }
1171         if (i < 0 && i != -EPIPE) {
1172                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1173                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1174                            current->comm, ctrl->bRequestType, ctrl->bRequest,
1175                            ctrl->wLength, i);
1176         }
1177         ret = i;
1178  done:
1179         free_page((unsigned long) tbuf);
1180         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1181                         sizeof(struct usb_ctrlrequest));
1182         return ret;
1183 }
1184
1185 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1186 {
1187         struct usbdevfs_ctrltransfer ctrl;
1188
1189         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1190                 return -EFAULT;
1191         return do_proc_control(ps, &ctrl);
1192 }
1193
1194 static int do_proc_bulk(struct usb_dev_state *ps,
1195                 struct usbdevfs_bulktransfer *bulk)
1196 {
1197         struct usb_device *dev = ps->dev;
1198         unsigned int tmo, len1, pipe;
1199         int len2;
1200         unsigned char *tbuf;
1201         int i, ret;
1202
1203         ret = findintfep(ps->dev, bulk->ep);
1204         if (ret < 0)
1205                 return ret;
1206         ret = checkintf(ps, ret);
1207         if (ret)
1208                 return ret;
1209         if (bulk->ep & USB_DIR_IN)
1210                 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1211         else
1212                 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1213         if (!usb_maxpacket(dev, pipe, !(bulk->ep & USB_DIR_IN)))
1214                 return -EINVAL;
1215         len1 = bulk->len;
1216         if (len1 >= (INT_MAX - sizeof(struct urb)))
1217                 return -EINVAL;
1218         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1219         if (ret)
1220                 return ret;
1221
1222         /*
1223          * len1 can be almost arbitrarily large.  Don't WARN if it's
1224          * too big, just fail the request.
1225          */
1226         tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1227         if (!tbuf) {
1228                 ret = -ENOMEM;
1229                 goto done;
1230         }
1231         tmo = bulk->timeout;
1232         if (bulk->ep & 0x80) {
1233                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1234
1235                 usb_unlock_device(dev);
1236                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1237                 usb_lock_device(dev);
1238                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1239
1240                 if (!i && len2) {
1241                         if (copy_to_user(bulk->data, tbuf, len2)) {
1242                                 ret = -EFAULT;
1243                                 goto done;
1244                         }
1245                 }
1246         } else {
1247                 if (len1) {
1248                         if (copy_from_user(tbuf, bulk->data, len1)) {
1249                                 ret = -EFAULT;
1250                                 goto done;
1251                         }
1252                 }
1253                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1254
1255                 usb_unlock_device(dev);
1256                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1257                 usb_lock_device(dev);
1258                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1259         }
1260         ret = (i < 0 ? i : len2);
1261  done:
1262         kfree(tbuf);
1263         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1264         return ret;
1265 }
1266
1267 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1268 {
1269         struct usbdevfs_bulktransfer bulk;
1270
1271         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1272                 return -EFAULT;
1273         return do_proc_bulk(ps, &bulk);
1274 }
1275
1276 static void check_reset_of_active_ep(struct usb_device *udev,
1277                 unsigned int epnum, char *ioctl_name)
1278 {
1279         struct usb_host_endpoint **eps;
1280         struct usb_host_endpoint *ep;
1281
1282         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1283         ep = eps[epnum & 0x0f];
1284         if (ep && !list_empty(&ep->urb_list))
1285                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1286                                 task_pid_nr(current), current->comm,
1287                                 ioctl_name, epnum);
1288 }
1289
1290 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1291 {
1292         unsigned int ep;
1293         int ret;
1294
1295         if (get_user(ep, (unsigned int __user *)arg))
1296                 return -EFAULT;
1297         ret = findintfep(ps->dev, ep);
1298         if (ret < 0)
1299                 return ret;
1300         ret = checkintf(ps, ret);
1301         if (ret)
1302                 return ret;
1303         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1304         usb_reset_endpoint(ps->dev, ep);
1305         return 0;
1306 }
1307
1308 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1309 {
1310         unsigned int ep;
1311         int pipe;
1312         int ret;
1313
1314         if (get_user(ep, (unsigned int __user *)arg))
1315                 return -EFAULT;
1316         ret = findintfep(ps->dev, ep);
1317         if (ret < 0)
1318                 return ret;
1319         ret = checkintf(ps, ret);
1320         if (ret)
1321                 return ret;
1322         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1323         if (ep & USB_DIR_IN)
1324                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1325         else
1326                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1327
1328         return usb_clear_halt(ps->dev, pipe);
1329 }
1330
1331 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1332 {
1333         struct usbdevfs_getdriver gd;
1334         struct usb_interface *intf;
1335         int ret;
1336
1337         if (copy_from_user(&gd, arg, sizeof(gd)))
1338                 return -EFAULT;
1339         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1340         if (!intf || !intf->dev.driver)
1341                 ret = -ENODATA;
1342         else {
1343                 strlcpy(gd.driver, intf->dev.driver->name,
1344                                 sizeof(gd.driver));
1345                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1346         }
1347         return ret;
1348 }
1349
1350 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1351 {
1352         struct usbdevfs_connectinfo ci;
1353
1354         memset(&ci, 0, sizeof(ci));
1355         ci.devnum = ps->dev->devnum;
1356         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1357
1358         if (copy_to_user(arg, &ci, sizeof(ci)))
1359                 return -EFAULT;
1360         return 0;
1361 }
1362
1363 static int proc_conninfo_ex(struct usb_dev_state *ps,
1364                             void __user *arg, size_t size)
1365 {
1366         struct usbdevfs_conninfo_ex ci;
1367         struct usb_device *udev = ps->dev;
1368
1369         if (size < sizeof(ci.size))
1370                 return -EINVAL;
1371
1372         memset(&ci, 0, sizeof(ci));
1373         ci.size = sizeof(ci);
1374         ci.busnum = udev->bus->busnum;
1375         ci.devnum = udev->devnum;
1376         ci.speed = udev->speed;
1377
1378         while (udev && udev->portnum != 0) {
1379                 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1380                         ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1381                                         udev->portnum;
1382                 udev = udev->parent;
1383         }
1384
1385         if (ci.num_ports < ARRAY_SIZE(ci.ports))
1386                 memmove(&ci.ports[0],
1387                         &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1388                         ci.num_ports);
1389
1390         if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1391                 return -EFAULT;
1392
1393         return 0;
1394 }
1395
1396 static int proc_resetdevice(struct usb_dev_state *ps)
1397 {
1398         struct usb_host_config *actconfig = ps->dev->actconfig;
1399         struct usb_interface *interface;
1400         int i, number;
1401
1402         /* Don't allow a device reset if the process has dropped the
1403          * privilege to do such things and any of the interfaces are
1404          * currently claimed.
1405          */
1406         if (ps->privileges_dropped && actconfig) {
1407                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1408                         interface = actconfig->interface[i];
1409                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1410                         if (usb_interface_claimed(interface) &&
1411                                         !test_bit(number, &ps->ifclaimed)) {
1412                                 dev_warn(&ps->dev->dev,
1413                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1414                                         number, interface->dev.driver->name, current->comm);
1415                                 return -EACCES;
1416                         }
1417                 }
1418         }
1419
1420         return usb_reset_device(ps->dev);
1421 }
1422
1423 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1424 {
1425         struct usbdevfs_setinterface setintf;
1426         int ret;
1427
1428         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1429                 return -EFAULT;
1430         ret = checkintf(ps, setintf.interface);
1431         if (ret)
1432                 return ret;
1433
1434         destroy_async_on_interface(ps, setintf.interface);
1435
1436         return usb_set_interface(ps->dev, setintf.interface,
1437                         setintf.altsetting);
1438 }
1439
1440 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1441 {
1442         int u;
1443         int status = 0;
1444         struct usb_host_config *actconfig;
1445
1446         if (get_user(u, (int __user *)arg))
1447                 return -EFAULT;
1448
1449         actconfig = ps->dev->actconfig;
1450
1451         /* Don't touch the device if any interfaces are claimed.
1452          * It could interfere with other drivers' operations, and if
1453          * an interface is claimed by usbfs it could easily deadlock.
1454          */
1455         if (actconfig) {
1456                 int i;
1457
1458                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1459                         if (usb_interface_claimed(actconfig->interface[i])) {
1460                                 dev_warn(&ps->dev->dev,
1461                                         "usbfs: interface %d claimed by %s "
1462                                         "while '%s' sets config #%d\n",
1463                                         actconfig->interface[i]
1464                                                 ->cur_altsetting
1465                                                 ->desc.bInterfaceNumber,
1466                                         actconfig->interface[i]
1467                                                 ->dev.driver->name,
1468                                         current->comm, u);
1469                                 status = -EBUSY;
1470                                 break;
1471                         }
1472                 }
1473         }
1474
1475         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1476          * so avoid usb_set_configuration()'s kick to sysfs
1477          */
1478         if (status == 0) {
1479                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1480                         status = usb_reset_configuration(ps->dev);
1481                 else
1482                         status = usb_set_configuration(ps->dev, u);
1483         }
1484
1485         return status;
1486 }
1487
1488 static struct usb_memory *
1489 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1490 {
1491         struct usb_memory *usbm = NULL, *iter;
1492         unsigned long flags;
1493         unsigned long uurb_start = (unsigned long)uurb->buffer;
1494
1495         spin_lock_irqsave(&ps->lock, flags);
1496         list_for_each_entry(iter, &ps->memory_list, memlist) {
1497                 if (uurb_start >= iter->vm_start &&
1498                                 uurb_start < iter->vm_start + iter->size) {
1499                         if (uurb->buffer_length > iter->vm_start + iter->size -
1500                                         uurb_start) {
1501                                 usbm = ERR_PTR(-EINVAL);
1502                         } else {
1503                                 usbm = iter;
1504                                 usbm->urb_use_count++;
1505                         }
1506                         break;
1507                 }
1508         }
1509         spin_unlock_irqrestore(&ps->lock, flags);
1510         return usbm;
1511 }
1512
1513 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1514                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1515                         void __user *arg, sigval_t userurb_sigval)
1516 {
1517         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1518         struct usb_host_endpoint *ep;
1519         struct async *as = NULL;
1520         struct usb_ctrlrequest *dr = NULL;
1521         unsigned int u, totlen, isofrmlen;
1522         int i, ret, num_sgs = 0, ifnum = -1;
1523         int number_of_packets = 0;
1524         unsigned int stream_id = 0;
1525         void *buf;
1526         bool is_in;
1527         bool allow_short = false;
1528         bool allow_zero = false;
1529         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1530                                 USBDEVFS_URB_BULK_CONTINUATION |
1531                                 USBDEVFS_URB_NO_FSBR |
1532                                 USBDEVFS_URB_ZERO_PACKET |
1533                                 USBDEVFS_URB_NO_INTERRUPT;
1534         /* USBDEVFS_URB_ISO_ASAP is a special case */
1535         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1536                 mask |= USBDEVFS_URB_ISO_ASAP;
1537
1538         if (uurb->flags & ~mask)
1539                         return -EINVAL;
1540
1541         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1542                 return -EINVAL;
1543         if (uurb->buffer_length > 0 && !uurb->buffer)
1544                 return -EINVAL;
1545         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1546             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1547                 ifnum = findintfep(ps->dev, uurb->endpoint);
1548                 if (ifnum < 0)
1549                         return ifnum;
1550                 ret = checkintf(ps, ifnum);
1551                 if (ret)
1552                         return ret;
1553         }
1554         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1555         if (!ep)
1556                 return -ENOENT;
1557         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1558
1559         u = 0;
1560         switch (uurb->type) {
1561         case USBDEVFS_URB_TYPE_CONTROL:
1562                 if (!usb_endpoint_xfer_control(&ep->desc))
1563                         return -EINVAL;
1564                 /* min 8 byte setup packet */
1565                 if (uurb->buffer_length < 8)
1566                         return -EINVAL;
1567                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1568                 if (!dr)
1569                         return -ENOMEM;
1570                 if (copy_from_user(dr, uurb->buffer, 8)) {
1571                         ret = -EFAULT;
1572                         goto error;
1573                 }
1574                 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1575                         ret = -EINVAL;
1576                         goto error;
1577                 }
1578                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1579                                       le16_to_cpu(dr->wIndex));
1580                 if (ret)
1581                         goto error;
1582                 uurb->buffer_length = le16_to_cpu(dr->wLength);
1583                 uurb->buffer += 8;
1584                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1585                         is_in = true;
1586                         uurb->endpoint |= USB_DIR_IN;
1587                 } else {
1588                         is_in = false;
1589                         uurb->endpoint &= ~USB_DIR_IN;
1590                 }
1591                 if (is_in)
1592                         allow_short = true;
1593                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1594                         "bRequest=%02x wValue=%04x "
1595                         "wIndex=%04x wLength=%04x\n",
1596                         dr->bRequestType, dr->bRequest,
1597                         __le16_to_cpu(dr->wValue),
1598                         __le16_to_cpu(dr->wIndex),
1599                         __le16_to_cpu(dr->wLength));
1600                 u = sizeof(struct usb_ctrlrequest);
1601                 break;
1602
1603         case USBDEVFS_URB_TYPE_BULK:
1604                 if (!is_in)
1605                         allow_zero = true;
1606                 else
1607                         allow_short = true;
1608                 switch (usb_endpoint_type(&ep->desc)) {
1609                 case USB_ENDPOINT_XFER_CONTROL:
1610                 case USB_ENDPOINT_XFER_ISOC:
1611                         return -EINVAL;
1612                 case USB_ENDPOINT_XFER_INT:
1613                         /* allow single-shot interrupt transfers */
1614                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1615                         goto interrupt_urb;
1616                 }
1617                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1618                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1619                         num_sgs = 0;
1620                 if (ep->streams)
1621                         stream_id = uurb->stream_id;
1622                 break;
1623
1624         case USBDEVFS_URB_TYPE_INTERRUPT:
1625                 if (!usb_endpoint_xfer_int(&ep->desc))
1626                         return -EINVAL;
1627  interrupt_urb:
1628                 if (!is_in)
1629                         allow_zero = true;
1630                 else
1631                         allow_short = true;
1632                 break;
1633
1634         case USBDEVFS_URB_TYPE_ISO:
1635                 /* arbitrary limit */
1636                 if (uurb->number_of_packets < 1 ||
1637                     uurb->number_of_packets > 128)
1638                         return -EINVAL;
1639                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1640                         return -EINVAL;
1641                 number_of_packets = uurb->number_of_packets;
1642                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1643                                    number_of_packets;
1644                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1645                 if (IS_ERR(isopkt)) {
1646                         ret = PTR_ERR(isopkt);
1647                         isopkt = NULL;
1648                         goto error;
1649                 }
1650                 for (totlen = u = 0; u < number_of_packets; u++) {
1651                         /*
1652                          * arbitrary limit need for USB 3.1 Gen2
1653                          * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1654                          */
1655                         if (isopkt[u].length > 98304) {
1656                                 ret = -EINVAL;
1657                                 goto error;
1658                         }
1659                         totlen += isopkt[u].length;
1660                 }
1661                 u *= sizeof(struct usb_iso_packet_descriptor);
1662                 uurb->buffer_length = totlen;
1663                 break;
1664
1665         default:
1666                 return -EINVAL;
1667         }
1668
1669         if (uurb->buffer_length > 0 &&
1670                         !access_ok(uurb->buffer, uurb->buffer_length)) {
1671                 ret = -EFAULT;
1672                 goto error;
1673         }
1674         as = alloc_async(number_of_packets);
1675         if (!as) {
1676                 ret = -ENOMEM;
1677                 goto error;
1678         }
1679
1680         as->usbm = find_memory_area(ps, uurb);
1681         if (IS_ERR(as->usbm)) {
1682                 ret = PTR_ERR(as->usbm);
1683                 as->usbm = NULL;
1684                 goto error;
1685         }
1686
1687         /* do not use SG buffers when memory mapped segments
1688          * are in use
1689          */
1690         if (as->usbm)
1691                 num_sgs = 0;
1692
1693         u += sizeof(struct async) + sizeof(struct urb) +
1694              (as->usbm ? 0 : uurb->buffer_length) +
1695              num_sgs * sizeof(struct scatterlist);
1696         ret = usbfs_increase_memory_usage(u);
1697         if (ret)
1698                 goto error;
1699         as->mem_usage = u;
1700
1701         if (num_sgs) {
1702                 as->urb->sg = kmalloc_array(num_sgs,
1703                                             sizeof(struct scatterlist),
1704                                             GFP_KERNEL | __GFP_NOWARN);
1705                 if (!as->urb->sg) {
1706                         ret = -ENOMEM;
1707                         goto error;
1708                 }
1709                 as->urb->num_sgs = num_sgs;
1710                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1711
1712                 totlen = uurb->buffer_length;
1713                 for (i = 0; i < as->urb->num_sgs; i++) {
1714                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1715                         buf = kmalloc(u, GFP_KERNEL);
1716                         if (!buf) {
1717                                 ret = -ENOMEM;
1718                                 goto error;
1719                         }
1720                         sg_set_buf(&as->urb->sg[i], buf, u);
1721
1722                         if (!is_in) {
1723                                 if (copy_from_user(buf, uurb->buffer, u)) {
1724                                         ret = -EFAULT;
1725                                         goto error;
1726                                 }
1727                                 uurb->buffer += u;
1728                         }
1729                         totlen -= u;
1730                 }
1731         } else if (uurb->buffer_length > 0) {
1732                 if (as->usbm) {
1733                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1734
1735                         as->urb->transfer_buffer = as->usbm->mem +
1736                                         (uurb_start - as->usbm->vm_start);
1737                 } else {
1738                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1739                                         GFP_KERNEL | __GFP_NOWARN);
1740                         if (!as->urb->transfer_buffer) {
1741                                 ret = -ENOMEM;
1742                                 goto error;
1743                         }
1744                         if (!is_in) {
1745                                 if (copy_from_user(as->urb->transfer_buffer,
1746                                                    uurb->buffer,
1747                                                    uurb->buffer_length)) {
1748                                         ret = -EFAULT;
1749                                         goto error;
1750                                 }
1751                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1752                                 /*
1753                                  * Isochronous input data may end up being
1754                                  * discontiguous if some of the packets are
1755                                  * short. Clear the buffer so that the gaps
1756                                  * don't leak kernel data to userspace.
1757                                  */
1758                                 memset(as->urb->transfer_buffer, 0,
1759                                                 uurb->buffer_length);
1760                         }
1761                 }
1762         }
1763         as->urb->dev = ps->dev;
1764         as->urb->pipe = (uurb->type << 30) |
1765                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1766                         (uurb->endpoint & USB_DIR_IN);
1767
1768         /* This tedious sequence is necessary because the URB_* flags
1769          * are internal to the kernel and subject to change, whereas
1770          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1771          */
1772         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1773         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1774                 u |= URB_ISO_ASAP;
1775         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1776                 u |= URB_SHORT_NOT_OK;
1777         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1778                 u |= URB_ZERO_PACKET;
1779         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1780                 u |= URB_NO_INTERRUPT;
1781         as->urb->transfer_flags = u;
1782
1783         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1784                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1785         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1786                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1787
1788         as->urb->transfer_buffer_length = uurb->buffer_length;
1789         as->urb->setup_packet = (unsigned char *)dr;
1790         dr = NULL;
1791         as->urb->start_frame = uurb->start_frame;
1792         as->urb->number_of_packets = number_of_packets;
1793         as->urb->stream_id = stream_id;
1794
1795         if (ep->desc.bInterval) {
1796                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1797                                 ps->dev->speed == USB_SPEED_HIGH ||
1798                                 ps->dev->speed >= USB_SPEED_SUPER)
1799                         as->urb->interval = 1 <<
1800                                         min(15, ep->desc.bInterval - 1);
1801                 else
1802                         as->urb->interval = ep->desc.bInterval;
1803         }
1804
1805         as->urb->context = as;
1806         as->urb->complete = async_completed;
1807         for (totlen = u = 0; u < number_of_packets; u++) {
1808                 as->urb->iso_frame_desc[u].offset = totlen;
1809                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1810                 totlen += isopkt[u].length;
1811         }
1812         kfree(isopkt);
1813         isopkt = NULL;
1814         as->ps = ps;
1815         as->userurb = arg;
1816         as->userurb_sigval = userurb_sigval;
1817         if (as->usbm) {
1818                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1819
1820                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1821                 as->urb->transfer_dma = as->usbm->dma_handle +
1822                                 (uurb_start - as->usbm->vm_start);
1823         } else if (is_in && uurb->buffer_length > 0)
1824                 as->userbuffer = uurb->buffer;
1825         as->signr = uurb->signr;
1826         as->ifnum = ifnum;
1827         as->pid = get_pid(task_pid(current));
1828         as->cred = get_current_cred();
1829         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1830                         as->urb->transfer_buffer_length, 0, SUBMIT,
1831                         NULL, 0);
1832         if (!is_in)
1833                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1834
1835         async_newpending(as);
1836
1837         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1838                 spin_lock_irq(&ps->lock);
1839
1840                 /* Not exactly the endpoint address; the direction bit is
1841                  * shifted to the 0x10 position so that the value will be
1842                  * between 0 and 31.
1843                  */
1844                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1845                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1846                                 >> 3);
1847
1848                 /* If this bulk URB is the start of a new transfer, re-enable
1849                  * the endpoint.  Otherwise mark it as a continuation URB.
1850                  */
1851                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1852                         as->bulk_status = AS_CONTINUATION;
1853                 else
1854                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1855
1856                 /* Don't accept continuation URBs if the endpoint is
1857                  * disabled because of an earlier error.
1858                  */
1859                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1860                         ret = -EREMOTEIO;
1861                 else
1862                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1863                 spin_unlock_irq(&ps->lock);
1864         } else {
1865                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1866         }
1867
1868         if (ret) {
1869                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1870                            "usbfs: usb_submit_urb returned %d\n", ret);
1871                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1872                                 0, ret, COMPLETE, NULL, 0);
1873                 async_removepending(as);
1874                 goto error;
1875         }
1876         return 0;
1877
1878  error:
1879         kfree(isopkt);
1880         kfree(dr);
1881         if (as)
1882                 free_async(as);
1883         return ret;
1884 }
1885
1886 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1887 {
1888         struct usbdevfs_urb uurb;
1889         sigval_t userurb_sigval;
1890
1891         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1892                 return -EFAULT;
1893
1894         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1895         userurb_sigval.sival_ptr = arg;
1896
1897         return proc_do_submiturb(ps, &uurb,
1898                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1899                         arg, userurb_sigval);
1900 }
1901
1902 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1903 {
1904         struct urb *urb;
1905         struct async *as;
1906         unsigned long flags;
1907
1908         spin_lock_irqsave(&ps->lock, flags);
1909         as = async_getpending(ps, arg);
1910         if (!as) {
1911                 spin_unlock_irqrestore(&ps->lock, flags);
1912                 return -EINVAL;
1913         }
1914
1915         urb = as->urb;
1916         usb_get_urb(urb);
1917         spin_unlock_irqrestore(&ps->lock, flags);
1918
1919         usb_kill_urb(urb);
1920         usb_put_urb(urb);
1921
1922         return 0;
1923 }
1924
1925 static void compute_isochronous_actual_length(struct urb *urb)
1926 {
1927         unsigned int i;
1928
1929         if (urb->number_of_packets > 0) {
1930                 urb->actual_length = 0;
1931                 for (i = 0; i < urb->number_of_packets; i++)
1932                         urb->actual_length +=
1933                                         urb->iso_frame_desc[i].actual_length;
1934         }
1935 }
1936
1937 static int processcompl(struct async *as, void __user * __user *arg)
1938 {
1939         struct urb *urb = as->urb;
1940         struct usbdevfs_urb __user *userurb = as->userurb;
1941         void __user *addr = as->userurb;
1942         unsigned int i;
1943
1944         compute_isochronous_actual_length(urb);
1945         if (as->userbuffer && urb->actual_length) {
1946                 if (copy_urb_data_to_user(as->userbuffer, urb))
1947                         goto err_out;
1948         }
1949         if (put_user(as->status, &userurb->status))
1950                 goto err_out;
1951         if (put_user(urb->actual_length, &userurb->actual_length))
1952                 goto err_out;
1953         if (put_user(urb->error_count, &userurb->error_count))
1954                 goto err_out;
1955
1956         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1957                 for (i = 0; i < urb->number_of_packets; i++) {
1958                         if (put_user(urb->iso_frame_desc[i].actual_length,
1959                                      &userurb->iso_frame_desc[i].actual_length))
1960                                 goto err_out;
1961                         if (put_user(urb->iso_frame_desc[i].status,
1962                                      &userurb->iso_frame_desc[i].status))
1963                                 goto err_out;
1964                 }
1965         }
1966
1967         if (put_user(addr, (void __user * __user *)arg))
1968                 return -EFAULT;
1969         return 0;
1970
1971 err_out:
1972         return -EFAULT;
1973 }
1974
1975 static struct async *reap_as(struct usb_dev_state *ps)
1976 {
1977         DECLARE_WAITQUEUE(wait, current);
1978         struct async *as = NULL;
1979         struct usb_device *dev = ps->dev;
1980
1981         add_wait_queue(&ps->wait, &wait);
1982         for (;;) {
1983                 __set_current_state(TASK_INTERRUPTIBLE);
1984                 as = async_getcompleted(ps);
1985                 if (as || !connected(ps))
1986                         break;
1987                 if (signal_pending(current))
1988                         break;
1989                 usb_unlock_device(dev);
1990                 schedule();
1991                 usb_lock_device(dev);
1992         }
1993         remove_wait_queue(&ps->wait, &wait);
1994         set_current_state(TASK_RUNNING);
1995         return as;
1996 }
1997
1998 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1999 {
2000         struct async *as = reap_as(ps);
2001
2002         if (as) {
2003                 int retval;
2004
2005                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2006                 retval = processcompl(as, (void __user * __user *)arg);
2007                 free_async(as);
2008                 return retval;
2009         }
2010         if (signal_pending(current))
2011                 return -EINTR;
2012         return -ENODEV;
2013 }
2014
2015 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2016 {
2017         int retval;
2018         struct async *as;
2019
2020         as = async_getcompleted(ps);
2021         if (as) {
2022                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2023                 retval = processcompl(as, (void __user * __user *)arg);
2024                 free_async(as);
2025         } else {
2026                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2027         }
2028         return retval;
2029 }
2030
2031 #ifdef CONFIG_COMPAT
2032 static int proc_control_compat(struct usb_dev_state *ps,
2033                                 struct usbdevfs_ctrltransfer32 __user *p32)
2034 {
2035         struct usbdevfs_ctrltransfer ctrl;
2036         u32 udata;
2037
2038         if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2039             get_user(udata, &p32->data))
2040                 return -EFAULT;
2041         ctrl.data = compat_ptr(udata);
2042         return do_proc_control(ps, &ctrl);
2043 }
2044
2045 static int proc_bulk_compat(struct usb_dev_state *ps,
2046                         struct usbdevfs_bulktransfer32 __user *p32)
2047 {
2048         struct usbdevfs_bulktransfer bulk;
2049         compat_caddr_t addr;
2050
2051         if (get_user(bulk.ep, &p32->ep) ||
2052             get_user(bulk.len, &p32->len) ||
2053             get_user(bulk.timeout, &p32->timeout) ||
2054             get_user(addr, &p32->data))
2055                 return -EFAULT;
2056         bulk.data = compat_ptr(addr);
2057         return do_proc_bulk(ps, &bulk);
2058 }
2059
2060 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2061 {
2062         struct usbdevfs_disconnectsignal32 ds;
2063
2064         if (copy_from_user(&ds, arg, sizeof(ds)))
2065                 return -EFAULT;
2066         ps->discsignr = ds.signr;
2067         ps->disccontext.sival_int = ds.context;
2068         return 0;
2069 }
2070
2071 static int get_urb32(struct usbdevfs_urb *kurb,
2072                      struct usbdevfs_urb32 __user *uurb)
2073 {
2074         struct usbdevfs_urb32 urb32;
2075         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2076                 return -EFAULT;
2077         kurb->type = urb32.type;
2078         kurb->endpoint = urb32.endpoint;
2079         kurb->status = urb32.status;
2080         kurb->flags = urb32.flags;
2081         kurb->buffer = compat_ptr(urb32.buffer);
2082         kurb->buffer_length = urb32.buffer_length;
2083         kurb->actual_length = urb32.actual_length;
2084         kurb->start_frame = urb32.start_frame;
2085         kurb->number_of_packets = urb32.number_of_packets;
2086         kurb->error_count = urb32.error_count;
2087         kurb->signr = urb32.signr;
2088         kurb->usercontext = compat_ptr(urb32.usercontext);
2089         return 0;
2090 }
2091
2092 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2093 {
2094         struct usbdevfs_urb uurb;
2095         sigval_t userurb_sigval;
2096
2097         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2098                 return -EFAULT;
2099
2100         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2101         userurb_sigval.sival_int = ptr_to_compat(arg);
2102
2103         return proc_do_submiturb(ps, &uurb,
2104                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2105                         arg, userurb_sigval);
2106 }
2107
2108 static int processcompl_compat(struct async *as, void __user * __user *arg)
2109 {
2110         struct urb *urb = as->urb;
2111         struct usbdevfs_urb32 __user *userurb = as->userurb;
2112         void __user *addr = as->userurb;
2113         unsigned int i;
2114
2115         compute_isochronous_actual_length(urb);
2116         if (as->userbuffer && urb->actual_length) {
2117                 if (copy_urb_data_to_user(as->userbuffer, urb))
2118                         return -EFAULT;
2119         }
2120         if (put_user(as->status, &userurb->status))
2121                 return -EFAULT;
2122         if (put_user(urb->actual_length, &userurb->actual_length))
2123                 return -EFAULT;
2124         if (put_user(urb->error_count, &userurb->error_count))
2125                 return -EFAULT;
2126
2127         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2128                 for (i = 0; i < urb->number_of_packets; i++) {
2129                         if (put_user(urb->iso_frame_desc[i].actual_length,
2130                                      &userurb->iso_frame_desc[i].actual_length))
2131                                 return -EFAULT;
2132                         if (put_user(urb->iso_frame_desc[i].status,
2133                                      &userurb->iso_frame_desc[i].status))
2134                                 return -EFAULT;
2135                 }
2136         }
2137
2138         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2139                 return -EFAULT;
2140         return 0;
2141 }
2142
2143 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2144 {
2145         struct async *as = reap_as(ps);
2146
2147         if (as) {
2148                 int retval;
2149
2150                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2151                 retval = processcompl_compat(as, (void __user * __user *)arg);
2152                 free_async(as);
2153                 return retval;
2154         }
2155         if (signal_pending(current))
2156                 return -EINTR;
2157         return -ENODEV;
2158 }
2159
2160 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2161 {
2162         int retval;
2163         struct async *as;
2164
2165         as = async_getcompleted(ps);
2166         if (as) {
2167                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2168                 retval = processcompl_compat(as, (void __user * __user *)arg);
2169                 free_async(as);
2170         } else {
2171                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2172         }
2173         return retval;
2174 }
2175
2176
2177 #endif
2178
2179 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2180 {
2181         struct usbdevfs_disconnectsignal ds;
2182
2183         if (copy_from_user(&ds, arg, sizeof(ds)))
2184                 return -EFAULT;
2185         ps->discsignr = ds.signr;
2186         ps->disccontext.sival_ptr = ds.context;
2187         return 0;
2188 }
2189
2190 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2191 {
2192         unsigned int ifnum;
2193
2194         if (get_user(ifnum, (unsigned int __user *)arg))
2195                 return -EFAULT;
2196         return claimintf(ps, ifnum);
2197 }
2198
2199 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2200 {
2201         unsigned int ifnum;
2202         int ret;
2203
2204         if (get_user(ifnum, (unsigned int __user *)arg))
2205                 return -EFAULT;
2206         ret = releaseintf(ps, ifnum);
2207         if (ret < 0)
2208                 return ret;
2209         destroy_async_on_interface(ps, ifnum);
2210         return 0;
2211 }
2212
2213 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2214 {
2215         int                     size;
2216         void                    *buf = NULL;
2217         int                     retval = 0;
2218         struct usb_interface    *intf = NULL;
2219         struct usb_driver       *driver = NULL;
2220
2221         if (ps->privileges_dropped)
2222                 return -EACCES;
2223
2224         if (!connected(ps))
2225                 return -ENODEV;
2226
2227         /* alloc buffer */
2228         size = _IOC_SIZE(ctl->ioctl_code);
2229         if (size > 0) {
2230                 buf = kmalloc(size, GFP_KERNEL);
2231                 if (buf == NULL)
2232                         return -ENOMEM;
2233                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2234                         if (copy_from_user(buf, ctl->data, size)) {
2235                                 kfree(buf);
2236                                 return -EFAULT;
2237                         }
2238                 } else {
2239                         memset(buf, 0, size);
2240                 }
2241         }
2242
2243         if (ps->dev->state != USB_STATE_CONFIGURED)
2244                 retval = -EHOSTUNREACH;
2245         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2246                 retval = -EINVAL;
2247         else switch (ctl->ioctl_code) {
2248
2249         /* disconnect kernel driver from interface */
2250         case USBDEVFS_DISCONNECT:
2251                 if (intf->dev.driver) {
2252                         driver = to_usb_driver(intf->dev.driver);
2253                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2254                         usb_driver_release_interface(driver, intf);
2255                 } else
2256                         retval = -ENODATA;
2257                 break;
2258
2259         /* let kernel drivers try to (re)bind to the interface */
2260         case USBDEVFS_CONNECT:
2261                 if (!intf->dev.driver)
2262                         retval = device_attach(&intf->dev);
2263                 else
2264                         retval = -EBUSY;
2265                 break;
2266
2267         /* talk directly to the interface's driver */
2268         default:
2269                 if (intf->dev.driver)
2270                         driver = to_usb_driver(intf->dev.driver);
2271                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2272                         retval = -ENOTTY;
2273                 } else {
2274                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2275                         if (retval == -ENOIOCTLCMD)
2276                                 retval = -ENOTTY;
2277                 }
2278         }
2279
2280         /* cleanup and return */
2281         if (retval >= 0
2282                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2283                         && size > 0
2284                         && copy_to_user(ctl->data, buf, size) != 0)
2285                 retval = -EFAULT;
2286
2287         kfree(buf);
2288         return retval;
2289 }
2290
2291 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2292 {
2293         struct usbdevfs_ioctl   ctrl;
2294
2295         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2296                 return -EFAULT;
2297         return proc_ioctl(ps, &ctrl);
2298 }
2299
2300 #ifdef CONFIG_COMPAT
2301 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2302 {
2303         struct usbdevfs_ioctl32 ioc32;
2304         struct usbdevfs_ioctl ctrl;
2305
2306         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2307                 return -EFAULT;
2308         ctrl.ifno = ioc32.ifno;
2309         ctrl.ioctl_code = ioc32.ioctl_code;
2310         ctrl.data = compat_ptr(ioc32.data);
2311         return proc_ioctl(ps, &ctrl);
2312 }
2313 #endif
2314
2315 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2316 {
2317         unsigned portnum;
2318         int rc;
2319
2320         if (get_user(portnum, (unsigned __user *) arg))
2321                 return -EFAULT;
2322         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2323         if (rc == 0)
2324                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2325                         portnum, task_pid_nr(current), current->comm);
2326         return rc;
2327 }
2328
2329 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2330 {
2331         unsigned portnum;
2332
2333         if (get_user(portnum, (unsigned __user *) arg))
2334                 return -EFAULT;
2335         return usb_hub_release_port(ps->dev, portnum, ps);
2336 }
2337
2338 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2339 {
2340         __u32 caps;
2341
2342         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2343                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2344                         USBDEVFS_CAP_DROP_PRIVILEGES |
2345                         USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2346         if (!ps->dev->bus->no_stop_on_short)
2347                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2348         if (ps->dev->bus->sg_tablesize)
2349                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2350
2351         if (put_user(caps, (__u32 __user *)arg))
2352                 return -EFAULT;
2353
2354         return 0;
2355 }
2356
2357 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2358 {
2359         struct usbdevfs_disconnect_claim dc;
2360         struct usb_interface *intf;
2361
2362         if (copy_from_user(&dc, arg, sizeof(dc)))
2363                 return -EFAULT;
2364
2365         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2366         if (!intf)
2367                 return -EINVAL;
2368
2369         if (intf->dev.driver) {
2370                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2371
2372                 if (ps->privileges_dropped)
2373                         return -EACCES;
2374
2375                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2376                                 strncmp(dc.driver, intf->dev.driver->name,
2377                                         sizeof(dc.driver)) != 0)
2378                         return -EBUSY;
2379
2380                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2381                                 strncmp(dc.driver, intf->dev.driver->name,
2382                                         sizeof(dc.driver)) == 0)
2383                         return -EBUSY;
2384
2385                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2386                 usb_driver_release_interface(driver, intf);
2387         }
2388
2389         return claimintf(ps, dc.interface);
2390 }
2391
2392 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2393 {
2394         unsigned num_streams, num_eps;
2395         struct usb_host_endpoint **eps;
2396         struct usb_interface *intf;
2397         int r;
2398
2399         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2400                                    &eps, &intf);
2401         if (r)
2402                 return r;
2403
2404         destroy_async_on_interface(ps,
2405                                    intf->altsetting[0].desc.bInterfaceNumber);
2406
2407         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2408         kfree(eps);
2409         return r;
2410 }
2411
2412 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2413 {
2414         unsigned num_eps;
2415         struct usb_host_endpoint **eps;
2416         struct usb_interface *intf;
2417         int r;
2418
2419         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2420         if (r)
2421                 return r;
2422
2423         destroy_async_on_interface(ps,
2424                                    intf->altsetting[0].desc.bInterfaceNumber);
2425
2426         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2427         kfree(eps);
2428         return r;
2429 }
2430
2431 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2432 {
2433         u32 data;
2434
2435         if (copy_from_user(&data, arg, sizeof(data)))
2436                 return -EFAULT;
2437
2438         /* This is a one way operation. Once privileges are
2439          * dropped, you cannot regain them. You may however reissue
2440          * this ioctl to shrink the allowed interfaces mask.
2441          */
2442         ps->interface_allowed_mask &= data;
2443         ps->privileges_dropped = true;
2444
2445         return 0;
2446 }
2447
2448 static int proc_forbid_suspend(struct usb_dev_state *ps)
2449 {
2450         int ret = 0;
2451
2452         if (ps->suspend_allowed) {
2453                 ret = usb_autoresume_device(ps->dev);
2454                 if (ret == 0)
2455                         ps->suspend_allowed = false;
2456                 else if (ret != -ENODEV)
2457                         ret = -EIO;
2458         }
2459         return ret;
2460 }
2461
2462 static int proc_allow_suspend(struct usb_dev_state *ps)
2463 {
2464         if (!connected(ps))
2465                 return -ENODEV;
2466
2467         WRITE_ONCE(ps->not_yet_resumed, 1);
2468         if (!ps->suspend_allowed) {
2469                 usb_autosuspend_device(ps->dev);
2470                 ps->suspend_allowed = true;
2471         }
2472         return 0;
2473 }
2474
2475 static int proc_wait_for_resume(struct usb_dev_state *ps)
2476 {
2477         int ret;
2478
2479         usb_unlock_device(ps->dev);
2480         ret = wait_event_interruptible(ps->wait_for_resume,
2481                         READ_ONCE(ps->not_yet_resumed) == 0);
2482         usb_lock_device(ps->dev);
2483
2484         if (ret != 0)
2485                 return -EINTR;
2486         return proc_forbid_suspend(ps);
2487 }
2488
2489 /*
2490  * NOTE:  All requests here that have interface numbers as parameters
2491  * are assuming that somehow the configuration has been prevented from
2492  * changing.  But there's no mechanism to ensure that...
2493  */
2494 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2495                                 void __user *p)
2496 {
2497         struct usb_dev_state *ps = file->private_data;
2498         struct inode *inode = file_inode(file);
2499         struct usb_device *dev = ps->dev;
2500         int ret = -ENOTTY;
2501
2502         if (!(file->f_mode & FMODE_WRITE))
2503                 return -EPERM;
2504
2505         usb_lock_device(dev);
2506
2507         /* Reap operations are allowed even after disconnection */
2508         switch (cmd) {
2509         case USBDEVFS_REAPURB:
2510                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2511                 ret = proc_reapurb(ps, p);
2512                 goto done;
2513
2514         case USBDEVFS_REAPURBNDELAY:
2515                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2516                 ret = proc_reapurbnonblock(ps, p);
2517                 goto done;
2518
2519 #ifdef CONFIG_COMPAT
2520         case USBDEVFS_REAPURB32:
2521                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2522                 ret = proc_reapurb_compat(ps, p);
2523                 goto done;
2524
2525         case USBDEVFS_REAPURBNDELAY32:
2526                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2527                 ret = proc_reapurbnonblock_compat(ps, p);
2528                 goto done;
2529 #endif
2530         }
2531
2532         if (!connected(ps)) {
2533                 usb_unlock_device(dev);
2534                 return -ENODEV;
2535         }
2536
2537         switch (cmd) {
2538         case USBDEVFS_CONTROL:
2539                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2540                 ret = proc_control(ps, p);
2541                 if (ret >= 0)
2542                         inode->i_mtime = current_time(inode);
2543                 break;
2544
2545         case USBDEVFS_BULK:
2546                 snoop(&dev->dev, "%s: BULK\n", __func__);
2547                 ret = proc_bulk(ps, p);
2548                 if (ret >= 0)
2549                         inode->i_mtime = current_time(inode);
2550                 break;
2551
2552         case USBDEVFS_RESETEP:
2553                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2554                 ret = proc_resetep(ps, p);
2555                 if (ret >= 0)
2556                         inode->i_mtime = current_time(inode);
2557                 break;
2558
2559         case USBDEVFS_RESET:
2560                 snoop(&dev->dev, "%s: RESET\n", __func__);
2561                 ret = proc_resetdevice(ps);
2562                 break;
2563
2564         case USBDEVFS_CLEAR_HALT:
2565                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2566                 ret = proc_clearhalt(ps, p);
2567                 if (ret >= 0)
2568                         inode->i_mtime = current_time(inode);
2569                 break;
2570
2571         case USBDEVFS_GETDRIVER:
2572                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2573                 ret = proc_getdriver(ps, p);
2574                 break;
2575
2576         case USBDEVFS_CONNECTINFO:
2577                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2578                 ret = proc_connectinfo(ps, p);
2579                 break;
2580
2581         case USBDEVFS_SETINTERFACE:
2582                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2583                 ret = proc_setintf(ps, p);
2584                 break;
2585
2586         case USBDEVFS_SETCONFIGURATION:
2587                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2588                 ret = proc_setconfig(ps, p);
2589                 break;
2590
2591         case USBDEVFS_SUBMITURB:
2592                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2593                 ret = proc_submiturb(ps, p);
2594                 if (ret >= 0)
2595                         inode->i_mtime = current_time(inode);
2596                 break;
2597
2598 #ifdef CONFIG_COMPAT
2599         case USBDEVFS_CONTROL32:
2600                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2601                 ret = proc_control_compat(ps, p);
2602                 if (ret >= 0)
2603                         inode->i_mtime = current_time(inode);
2604                 break;
2605
2606         case USBDEVFS_BULK32:
2607                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2608                 ret = proc_bulk_compat(ps, p);
2609                 if (ret >= 0)
2610                         inode->i_mtime = current_time(inode);
2611                 break;
2612
2613         case USBDEVFS_DISCSIGNAL32:
2614                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2615                 ret = proc_disconnectsignal_compat(ps, p);
2616                 break;
2617
2618         case USBDEVFS_SUBMITURB32:
2619                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2620                 ret = proc_submiturb_compat(ps, p);
2621                 if (ret >= 0)
2622                         inode->i_mtime = current_time(inode);
2623                 break;
2624
2625         case USBDEVFS_IOCTL32:
2626                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2627                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2628                 break;
2629 #endif
2630
2631         case USBDEVFS_DISCARDURB:
2632                 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2633                 ret = proc_unlinkurb(ps, p);
2634                 break;
2635
2636         case USBDEVFS_DISCSIGNAL:
2637                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2638                 ret = proc_disconnectsignal(ps, p);
2639                 break;
2640
2641         case USBDEVFS_CLAIMINTERFACE:
2642                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2643                 ret = proc_claiminterface(ps, p);
2644                 break;
2645
2646         case USBDEVFS_RELEASEINTERFACE:
2647                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2648                 ret = proc_releaseinterface(ps, p);
2649                 break;
2650
2651         case USBDEVFS_IOCTL:
2652                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2653                 ret = proc_ioctl_default(ps, p);
2654                 break;
2655
2656         case USBDEVFS_CLAIM_PORT:
2657                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2658                 ret = proc_claim_port(ps, p);
2659                 break;
2660
2661         case USBDEVFS_RELEASE_PORT:
2662                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2663                 ret = proc_release_port(ps, p);
2664                 break;
2665         case USBDEVFS_GET_CAPABILITIES:
2666                 ret = proc_get_capabilities(ps, p);
2667                 break;
2668         case USBDEVFS_DISCONNECT_CLAIM:
2669                 ret = proc_disconnect_claim(ps, p);
2670                 break;
2671         case USBDEVFS_ALLOC_STREAMS:
2672                 ret = proc_alloc_streams(ps, p);
2673                 break;
2674         case USBDEVFS_FREE_STREAMS:
2675                 ret = proc_free_streams(ps, p);
2676                 break;
2677         case USBDEVFS_DROP_PRIVILEGES:
2678                 ret = proc_drop_privileges(ps, p);
2679                 break;
2680         case USBDEVFS_GET_SPEED:
2681                 ret = ps->dev->speed;
2682                 break;
2683         case USBDEVFS_FORBID_SUSPEND:
2684                 ret = proc_forbid_suspend(ps);
2685                 break;
2686         case USBDEVFS_ALLOW_SUSPEND:
2687                 ret = proc_allow_suspend(ps);
2688                 break;
2689         case USBDEVFS_WAIT_FOR_RESUME:
2690                 ret = proc_wait_for_resume(ps);
2691                 break;
2692         }
2693
2694         /* Handle variable-length commands */
2695         switch (cmd & ~IOCSIZE_MASK) {
2696         case USBDEVFS_CONNINFO_EX(0):
2697                 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2698                 break;
2699         }
2700
2701  done:
2702         usb_unlock_device(dev);
2703         if (ret >= 0)
2704                 inode->i_atime = current_time(inode);
2705         return ret;
2706 }
2707
2708 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2709                         unsigned long arg)
2710 {
2711         int ret;
2712
2713         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2714
2715         return ret;
2716 }
2717
2718 /* No kernel lock - fine */
2719 static __poll_t usbdev_poll(struct file *file,
2720                                 struct poll_table_struct *wait)
2721 {
2722         struct usb_dev_state *ps = file->private_data;
2723         __poll_t mask = 0;
2724
2725         poll_wait(file, &ps->wait, wait);
2726         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2727                 mask |= EPOLLOUT | EPOLLWRNORM;
2728         if (!connected(ps))
2729                 mask |= EPOLLHUP;
2730         if (list_empty(&ps->list))
2731                 mask |= EPOLLERR;
2732         return mask;
2733 }
2734
2735 const struct file_operations usbdev_file_operations = {
2736         .owner =          THIS_MODULE,
2737         .llseek =         no_seek_end_llseek,
2738         .read =           usbdev_read,
2739         .poll =           usbdev_poll,
2740         .unlocked_ioctl = usbdev_ioctl,
2741         .compat_ioctl =   compat_ptr_ioctl,
2742         .mmap =           usbdev_mmap,
2743         .open =           usbdev_open,
2744         .release =        usbdev_release,
2745 };
2746
2747 static void usbdev_remove(struct usb_device *udev)
2748 {
2749         struct usb_dev_state *ps;
2750
2751         /* Protect against simultaneous resume */
2752         mutex_lock(&usbfs_mutex);
2753         while (!list_empty(&udev->filelist)) {
2754                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2755                 destroy_all_async(ps);
2756                 wake_up_all(&ps->wait);
2757                 WRITE_ONCE(ps->not_yet_resumed, 0);
2758                 wake_up_all(&ps->wait_for_resume);
2759                 list_del_init(&ps->list);
2760                 if (ps->discsignr)
2761                         kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2762                                              ps->disc_pid, ps->cred);
2763         }
2764         mutex_unlock(&usbfs_mutex);
2765 }
2766
2767 static int usbdev_notify(struct notifier_block *self,
2768                                unsigned long action, void *dev)
2769 {
2770         switch (action) {
2771         case USB_DEVICE_ADD:
2772                 break;
2773         case USB_DEVICE_REMOVE:
2774                 usbdev_remove(dev);
2775                 break;
2776         }
2777         return NOTIFY_OK;
2778 }
2779
2780 static struct notifier_block usbdev_nb = {
2781         .notifier_call =        usbdev_notify,
2782 };
2783
2784 static struct cdev usb_device_cdev;
2785
2786 int __init usb_devio_init(void)
2787 {
2788         int retval;
2789
2790         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2791                                         "usb_device");
2792         if (retval) {
2793                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2794                 goto out;
2795         }
2796         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2797         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2798         if (retval) {
2799                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2800                        USB_DEVICE_MAJOR);
2801                 goto error_cdev;
2802         }
2803         usb_register_notify(&usbdev_nb);
2804 out:
2805         return retval;
2806
2807 error_cdev:
2808         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2809         goto out;
2810 }
2811
2812 void usb_devio_cleanup(void)
2813 {
2814         usb_unregister_notify(&usbdev_nb);
2815         cdev_del(&usb_device_cdev);
2816         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2817 }