drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/sched/signal.h>
  40 #include <linux/slab.h>
  41 #include <linux/signal.h>
  42 #include <linux/poll.h>
  43 #include <linux/module.h>
  44 #include <linux/string.h>
  45 #include <linux/usb.h>
  46 #include <linux/usbdevice_fs.h>
  47 #include <linux/usb/hcd.h>      /* for usbcore internals */
  48 #include <linux/cdev.h>
  49 #include <linux/notifier.h>
  50 #include <linux/security.h>
  51 #include <linux/user_namespace.h>
  52 #include <linux/scatterlist.h>
  53 #include <linux/uaccess.h>
  54 #include <linux/dma-mapping.h>
  55 #include <asm/byteorder.h>
  56 #include <linux/moduleparam.h>
  57
  58 #include "usb.h"
  59
  60 #define USB_MAXBUS                      64
  61 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  62 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  63
  64 /* Mutual exclusion for removal, open, and release */
  65 DEFINE_MUTEX(usbfs_mutex);
  66
  67 struct usb_dev_state {
  68         struct list_head list;      /* state list */
  69         struct usb_device *dev;
  70         struct file *file;
  71         spinlock_t lock;            /* protects the async urb lists */
  72         struct list_head async_pending;
  73         struct list_head async_completed;
  74         struct list_head memory_list;
  75         wait_queue_head_t wait;     /* wake up if a request completed */
  76         unsigned int discsignr;
  77         struct pid *disc_pid;
  78         const struct cred *cred;
  79         void __user *disccontext;
  80         unsigned long ifclaimed;
  81         u32 secid;
  82         u32 disabled_bulk_eps;
  83         bool privileges_dropped;
  84         unsigned long interface_allowed_mask;
  85 };
  86
  87 struct usb_memory {
  88         struct list_head memlist;
  89         int vma_use_count;
  90         int urb_use_count;
  91         u32 size;
  92         void *mem;
  93         dma_addr_t dma_handle;
  94         unsigned long vm_start;
  95         struct usb_dev_state *ps;
  96 };
  97
  98 struct async {
  99         struct list_head asynclist;
 100         struct usb_dev_state *ps;
 101         struct pid *pid;
 102         const struct cred *cred;
 103         unsigned int signr;
 104         unsigned int ifnum;
 105         void __user *userbuffer;
 106         void __user *userurb;
 107         struct urb *urb;
 108         struct usb_memory *usbm;
 109         unsigned int mem_usage;
 110         int status;
 111         u32 secid;
 112         u8 bulk_addr;
 113         u8 bulk_status;
 114 };
 115
 116 static bool usbfs_snoop;
 117 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 118 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 119
 120 static unsigned usbfs_snoop_max = 65536;
 121 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 122 MODULE_PARM_DESC(usbfs_snoop_max,
 123                 "maximum number of bytes to print while snooping");
 124
 125 #define snoop(dev, format, arg...)                              \
 126         do {                                                    \
 127                 if (usbfs_snoop)                                \
 128                         dev_info(dev, format, ## arg);          \
 129         } while (0)
 130
 131 enum snoop_when {
 132         SUBMIT, COMPLETE
 133 };
 134
 135 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 136
 137 /* Limit on the total amount of memory we can allocate for transfers */
 138 static u32 usbfs_memory_mb = 16;
 139 module_param(usbfs_memory_mb, uint, 0644);
 140 MODULE_PARM_DESC(usbfs_memory_mb,
 141                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 142
 143 /* Hard limit, necessary to avoid arithmetic overflow */
 144 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 145
 146 static atomic64_t usbfs_memory_usage;   /* Total memory currently allocated */
 147
 148 /* Check whether it's okay to allocate more memory for a transfer */
 149 static int usbfs_increase_memory_usage(u64 amount)
 150 {
 151         u64 lim;
 152
 153         lim = ACCESS_ONCE(usbfs_memory_mb);
 154         lim <<= 20;
 155
 156         atomic64_add(amount, &usbfs_memory_usage);
 157
 158         if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
 159                 atomic64_sub(amount, &usbfs_memory_usage);
 160                 return -ENOMEM;
 161         }
 162
 163         return 0;
 164 }
 165
 166 /* Memory for a transfer is being deallocated */
 167 static void usbfs_decrease_memory_usage(u64 amount)
 168 {
 169         atomic64_sub(amount, &usbfs_memory_usage);
 170 }
 171
 172 static int connected(struct usb_dev_state *ps)
 173 {
 174         return (!list_empty(&ps->list) &&
 175                         ps->dev->state != USB_STATE_NOTATTACHED);
 176 }
 177
 178 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 179 {
 180         struct usb_dev_state *ps = usbm->ps;
 181         unsigned long flags;
 182
 183         spin_lock_irqsave(&ps->lock, flags);
 184         --*count;
 185         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 186                 list_del(&usbm->memlist);
 187                 spin_unlock_irqrestore(&ps->lock, flags);
 188
 189                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 190                                 usbm->dma_handle);
 191                 usbfs_decrease_memory_usage(
 192                         usbm->size + sizeof(struct usb_memory));
 193                 kfree(usbm);
 194         } else {
 195                 spin_unlock_irqrestore(&ps->lock, flags);
 196         }
 197 }
 198
 199 static void usbdev_vm_open(struct vm_area_struct *vma)
 200 {
 201         struct usb_memory *usbm = vma->vm_private_data;
 202         unsigned long flags;
 203
 204         spin_lock_irqsave(&usbm->ps->lock, flags);
 205         ++usbm->vma_use_count;
 206         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 207 }
 208
 209 static void usbdev_vm_close(struct vm_area_struct *vma)
 210 {
 211         struct usb_memory *usbm = vma->vm_private_data;
 212
 213         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 214 }
 215
 216 static const struct vm_operations_struct usbdev_vm_ops = {
 217         .open = usbdev_vm_open,
 218         .close = usbdev_vm_close
 219 };
 220
 221 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 222 {
 223         struct usb_memory *usbm = NULL;
 224         struct usb_dev_state *ps = file->private_data;
 225         size_t size = vma->vm_end - vma->vm_start;
 226         void *mem;
 227         unsigned long flags;
 228         dma_addr_t dma_handle;
 229         int ret;
 230
 231         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 232         if (ret)
 233                 goto error;
 234
 235         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 236         if (!usbm) {
 237                 ret = -ENOMEM;
 238                 goto error_decrease_mem;
 239         }
 240
 241         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 242                         &dma_handle);
 243         if (!mem) {
 244                 ret = -ENOMEM;
 245                 goto error_free_usbm;
 246         }
 247
 248         memset(mem, 0, size);
 249
 250         usbm->mem = mem;
 251         usbm->dma_handle = dma_handle;
 252         usbm->size = size;
 253         usbm->ps = ps;
 254         usbm->vm_start = vma->vm_start;
 255         usbm->vma_use_count = 1;
 256         INIT_LIST_HEAD(&usbm->memlist);
 257
 258         if (remap_pfn_range(vma, vma->vm_start,
 259                         virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 260                         size, vma->vm_page_prot) < 0) {
 261                 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 262                 return -EAGAIN;
 263         }
 264
 265         vma->vm_flags |= VM_IO;
 266         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 267         vma->vm_ops = &usbdev_vm_ops;
 268         vma->vm_private_data = usbm;
 269
 270         spin_lock_irqsave(&ps->lock, flags);
 271         list_add_tail(&usbm->memlist, &ps->memory_list);
 272         spin_unlock_irqrestore(&ps->lock, flags);
 273
 274         return 0;
 275
 276 error_free_usbm:
 277         kfree(usbm);
 278 error_decrease_mem:
 279         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 280 error:
 281         return ret;
 282 }
 283
 284 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 285                            loff_t *ppos)
 286 {
 287         struct usb_dev_state *ps = file->private_data;
 288         struct usb_device *dev = ps->dev;
 289         ssize_t ret = 0;
 290         unsigned len;
 291         loff_t pos;
 292         int i;
 293
 294         pos = *ppos;
 295         usb_lock_device(dev);
 296         if (!connected(ps)) {
 297                 ret = -ENODEV;
 298                 goto err;
 299         } else if (pos < 0) {
 300                 ret = -EINVAL;
 301                 goto err;
 302         }
 303
 304         if (pos < sizeof(struct usb_device_descriptor)) {
 305                 /* 18 bytes - fits on the stack */
 306                 struct usb_device_descriptor temp_desc;
 307
 308                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 309                 le16_to_cpus(&temp_desc.bcdUSB);
 310                 le16_to_cpus(&temp_desc.idVendor);
 311                 le16_to_cpus(&temp_desc.idProduct);
 312                 le16_to_cpus(&temp_desc.bcdDevice);
 313
 314                 len = sizeof(struct usb_device_descriptor) - pos;
 315                 if (len > nbytes)
 316                         len = nbytes;
 317                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 318                         ret = -EFAULT;
 319                         goto err;
 320                 }
 321
 322                 *ppos += len;
 323                 buf += len;
 324                 nbytes -= len;
 325                 ret += len;
 326         }
 327
 328         pos = sizeof(struct usb_device_descriptor);
 329         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 330                 struct usb_config_descriptor *config =
 331                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 332                 unsigned int length = le16_to_cpu(config->wTotalLength);
 333
 334                 if (*ppos < pos + length) {
 335
 336                         /* The descriptor may claim to be longer than it
 337                          * really is.  Here is the actual allocated length. */
 338                         unsigned alloclen =
 339                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 340
 341                         len = length - (*ppos - pos);
 342                         if (len > nbytes)
 343                                 len = nbytes;
 344
 345                         /* Simply don't write (skip over) unallocated parts */
 346                         if (alloclen > (*ppos - pos)) {
 347                                 alloclen -= (*ppos - pos);
 348                                 if (copy_to_user(buf,
 349                                     dev->rawdescriptors[i] + (*ppos - pos),
 350                                     min(len, alloclen))) {
 351                                         ret = -EFAULT;
 352                                         goto err;
 353                                 }
 354                         }
 355
 356                         *ppos += len;
 357                         buf += len;
 358                         nbytes -= len;
 359                         ret += len;
 360                 }
 361
 362                 pos += length;
 363         }
 364
 365 err:
 366         usb_unlock_device(dev);
 367         return ret;
 368 }
 369
 370 /*
 371  * async list handling
 372  */
 373
 374 static struct async *alloc_async(unsigned int numisoframes)
 375 {
 376         struct async *as;
 377
 378         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 379         if (!as)
 380                 return NULL;
 381         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 382         if (!as->urb) {
 383                 kfree(as);
 384                 return NULL;
 385         }
 386         return as;
 387 }
 388
 389 static void free_async(struct async *as)
 390 {
 391         int i;
 392
 393         put_pid(as->pid);
 394         if (as->cred)
 395                 put_cred(as->cred);
 396         for (i = 0; i < as->urb->num_sgs; i++) {
 397                 if (sg_page(&as->urb->sg[i]))
 398                         kfree(sg_virt(&as->urb->sg[i]));
 399         }
 400
 401         kfree(as->urb->sg);
 402         if (as->usbm == NULL)
 403                 kfree(as->urb->transfer_buffer);
 404         else
 405                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 406
 407         kfree(as->urb->setup_packet);
 408         usb_free_urb(as->urb);
 409         usbfs_decrease_memory_usage(as->mem_usage);
 410         kfree(as);
 411 }
 412
 413 static void async_newpending(struct async *as)
 414 {
 415         struct usb_dev_state *ps = as->ps;
 416         unsigned long flags;
 417
 418         spin_lock_irqsave(&ps->lock, flags);
 419         list_add_tail(&as->asynclist, &ps->async_pending);
 420         spin_unlock_irqrestore(&ps->lock, flags);
 421 }
 422
 423 static void async_removepending(struct async *as)
 424 {
 425         struct usb_dev_state *ps = as->ps;
 426         unsigned long flags;
 427
 428         spin_lock_irqsave(&ps->lock, flags);
 429         list_del_init(&as->asynclist);
 430         spin_unlock_irqrestore(&ps->lock, flags);
 431 }
 432
 433 static struct async *async_getcompleted(struct usb_dev_state *ps)
 434 {
 435         unsigned long flags;
 436         struct async *as = NULL;
 437
 438         spin_lock_irqsave(&ps->lock, flags);
 439         if (!list_empty(&ps->async_completed)) {
 440                 as = list_entry(ps->async_completed.next, struct async,
 441                                 asynclist);
 442                 list_del_init(&as->asynclist);
 443         }
 444         spin_unlock_irqrestore(&ps->lock, flags);
 445         return as;
 446 }
 447
 448 static struct async *async_getpending(struct usb_dev_state *ps,
 449                                              void __user *userurb)
 450 {
 451         struct async *as;
 452
 453         list_for_each_entry(as, &ps->async_pending, asynclist)
 454                 if (as->userurb == userurb) {
 455                         list_del_init(&as->asynclist);
 456                         return as;
 457                 }
 458
 459         return NULL;
 460 }
 461
 462 static void snoop_urb(struct usb_device *udev,
 463                 void __user *userurb, int pipe, unsigned length,
 464                 int timeout_or_status, enum snoop_when when,
 465                 unsigned char *data, unsigned data_len)
 466 {
 467         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 468         static const char *dirs[] = {"out", "in"};
 469         int ep;
 470         const char *t, *d;
 471
 472         if (!usbfs_snoop)
 473                 return;
 474
 475         ep = usb_pipeendpoint(pipe);
 476         t = types[usb_pipetype(pipe)];
 477         d = dirs[!!usb_pipein(pipe)];
 478
 479         if (userurb) {          /* Async */
 480                 if (when == SUBMIT)
 481                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 482                                         "length %u\n",
 483                                         userurb, ep, t, d, length);
 484                 else
 485                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 486                                         "actual_length %u status %d\n",
 487                                         userurb, ep, t, d, length,
 488                                         timeout_or_status);
 489         } else {
 490                 if (when == SUBMIT)
 491                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 492                                         "timeout %d\n",
 493                                         ep, t, d, length, timeout_or_status);
 494                 else
 495                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 496                                         "status %d\n",
 497                                         ep, t, d, length, timeout_or_status);
 498         }
 499
 500         data_len = min(data_len, usbfs_snoop_max);
 501         if (data && data_len > 0) {
 502                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 503                         data, data_len, 1);
 504         }
 505 }
 506
 507 static void snoop_urb_data(struct urb *urb, unsigned len)
 508 {
 509         int i, size;
 510
 511         len = min(len, usbfs_snoop_max);
 512         if (!usbfs_snoop || len == 0)
 513                 return;
 514
 515         if (urb->num_sgs == 0) {
 516                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 517                         urb->transfer_buffer, len, 1);
 518                 return;
 519         }
 520
 521         for (i = 0; i < urb->num_sgs && len; i++) {
 522                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 523                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 524                         sg_virt(&urb->sg[i]), size, 1);
 525                 len -= size;
 526         }
 527 }
 528
 529 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 530 {
 531         unsigned i, len, size;
 532
 533         if (urb->number_of_packets > 0)         /* Isochronous */
 534                 len = urb->transfer_buffer_length;
 535         else                                    /* Non-Isoc */
 536                 len = urb->actual_length;
 537
 538         if (urb->num_sgs == 0) {
 539                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 540                         return -EFAULT;
 541                 return 0;
 542         }
 543
 544         for (i = 0; i < urb->num_sgs && len; i++) {
 545                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 546                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 547                         return -EFAULT;
 548                 userbuffer += size;
 549                 len -= size;
 550         }
 551
 552         return 0;
 553 }
 554
 555 #define AS_CONTINUATION 1
 556 #define AS_UNLINK       2
 557
 558 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 559 __releases(ps->lock)
 560 __acquires(ps->lock)
 561 {
 562         struct urb *urb;
 563         struct async *as;
 564
 565         /* Mark all the pending URBs that match bulk_addr, up to but not
 566          * including the first one without AS_CONTINUATION.  If such an
 567          * URB is encountered then a new transfer has already started so
 568          * the endpoint doesn't need to be disabled; otherwise it does.
 569          */
 570         list_for_each_entry(as, &ps->async_pending, asynclist) {
 571                 if (as->bulk_addr == bulk_addr) {
 572                         if (as->bulk_status != AS_CONTINUATION)
 573                                 goto rescan;
 574                         as->bulk_status = AS_UNLINK;
 575                         as->bulk_addr = 0;
 576                 }
 577         }
 578         ps->disabled_bulk_eps |= (1 << bulk_addr);
 579
 580         /* Now carefully unlink all the marked pending URBs */
 581  rescan:
 582         list_for_each_entry(as, &ps->async_pending, asynclist) {
 583                 if (as->bulk_status == AS_UNLINK) {
 584                         as->bulk_status = 0;            /* Only once */
 585                         urb = as->urb;
 586                         usb_get_urb(urb);
 587                         spin_unlock(&ps->lock);         /* Allow completions */
 588                         usb_unlink_urb(urb);
 589                         usb_put_urb(urb);
 590                         spin_lock(&ps->lock);
 591                         goto rescan;
 592                 }
 593         }
 594 }
 595
 596 static void async_completed(struct urb *urb)
 597 {
 598         struct async *as = urb->context;
 599         struct usb_dev_state *ps = as->ps;
 600         struct siginfo sinfo;
 601         struct pid *pid = NULL;
 602         u32 secid = 0;
 603         const struct cred *cred = NULL;
 604         int signr;
 605
 606         spin_lock(&ps->lock);
 607         list_move_tail(&as->asynclist, &ps->async_completed);
 608         as->status = urb->status;
 609         signr = as->signr;
 610         if (signr) {
 611                 memset(&sinfo, 0, sizeof(sinfo));
 612                 sinfo.si_signo = as->signr;
 613                 sinfo.si_errno = as->status;
 614                 sinfo.si_code = SI_ASYNCIO;
 615                 sinfo.si_addr = as->userurb;
 616                 pid = get_pid(as->pid);
 617                 cred = get_cred(as->cred);
 618                 secid = as->secid;
 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 ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
 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(&ps->lock);
 632
 633         if (signr) {
 634                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
 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_entry(list->next, 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 /* The following routines are merely placeholders.  There is no way
 719  * to inform a user task about suspend or resumes.
 720  */
 721 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 722 {
 723         return 0;
 724 }
 725
 726 static int driver_resume(struct usb_interface *intf)
 727 {
 728         return 0;
 729 }
 730
 731 struct usb_driver usbfs_driver = {
 732         .name =         "usbfs",
 733         .probe =        driver_probe,
 734         .disconnect =   driver_disconnect,
 735         .suspend =      driver_suspend,
 736         .resume =       driver_resume,
 737 };
 738
 739 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 740 {
 741         struct usb_device *dev = ps->dev;
 742         struct usb_interface *intf;
 743         int err;
 744
 745         if (ifnum >= 8*sizeof(ps->ifclaimed))
 746                 return -EINVAL;
 747         /* already claimed */
 748         if (test_bit(ifnum, &ps->ifclaimed))
 749                 return 0;
 750
 751         if (ps->privileges_dropped &&
 752                         !test_bit(ifnum, &ps->interface_allowed_mask))
 753                 return -EACCES;
 754
 755         intf = usb_ifnum_to_if(dev, ifnum);
 756         if (!intf)
 757                 err = -ENOENT;
 758         else
 759                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 760         if (err == 0)
 761                 set_bit(ifnum, &ps->ifclaimed);
 762         return err;
 763 }
 764
 765 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 766 {
 767         struct usb_device *dev;
 768         struct usb_interface *intf;
 769         int err;
 770
 771         err = -EINVAL;
 772         if (ifnum >= 8*sizeof(ps->ifclaimed))
 773                 return err;
 774         dev = ps->dev;
 775         intf = usb_ifnum_to_if(dev, ifnum);
 776         if (!intf)
 777                 err = -ENOENT;
 778         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 779                 usb_driver_release_interface(&usbfs_driver, intf);
 780                 err = 0;
 781         }
 782         return err;
 783 }
 784
 785 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 786 {
 787         if (ps->dev->state != USB_STATE_CONFIGURED)
 788                 return -EHOSTUNREACH;
 789         if (ifnum >= 8*sizeof(ps->ifclaimed))
 790                 return -EINVAL;
 791         if (test_bit(ifnum, &ps->ifclaimed))
 792                 return 0;
 793         /* if not yet claimed, claim it for the driver */
 794         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 795                  "interface %u before use\n", task_pid_nr(current),
 796                  current->comm, ifnum);
 797         return claimintf(ps, ifnum);
 798 }
 799
 800 static int findintfep(struct usb_device *dev, unsigned int ep)
 801 {
 802         unsigned int i, j, e;
 803         struct usb_interface *intf;
 804         struct usb_host_interface *alts;
 805         struct usb_endpoint_descriptor *endpt;
 806
 807         if (ep & ~(USB_DIR_IN|0xf))
 808                 return -EINVAL;
 809         if (!dev->actconfig)
 810                 return -ESRCH;
 811         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 812                 intf = dev->actconfig->interface[i];
 813                 for (j = 0; j < intf->num_altsetting; j++) {
 814                         alts = &intf->altsetting[j];
 815                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 816                                 endpt = &alts->endpoint[e].desc;
 817                                 if (endpt->bEndpointAddress == ep)
 818                                         return alts->desc.bInterfaceNumber;
 819                         }
 820                 }
 821         }
 822         return -ENOENT;
 823 }
 824
 825 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 826                            unsigned int request, unsigned int index)
 827 {
 828         int ret = 0;
 829         struct usb_host_interface *alt_setting;
 830
 831         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 832          && ps->dev->state != USB_STATE_ADDRESS
 833          && ps->dev->state != USB_STATE_CONFIGURED)
 834                 return -EHOSTUNREACH;
 835         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 836                 return 0;
 837
 838         /*
 839          * check for the special corner case 'get_device_id' in the printer
 840          * class specification, which we always want to allow as it is used
 841          * to query things like ink level, etc.
 842          */
 843         if (requesttype == 0xa1 && request == 0) {
 844                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 845                                                    index >> 8, index & 0xff);
 846                 if (alt_setting
 847                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 848                         return 0;
 849         }
 850
 851         index &= 0xff;
 852         switch (requesttype & USB_RECIP_MASK) {
 853         case USB_RECIP_ENDPOINT:
 854                 if ((index & ~USB_DIR_IN) == 0)
 855                         return 0;
 856                 ret = findintfep(ps->dev, index);
 857                 if (ret < 0) {
 858                         /*
 859                          * Some not fully compliant Win apps seem to get
 860                          * index wrong and have the endpoint number here
 861                          * rather than the endpoint address (with the
 862                          * correct direction). Win does let this through,
 863                          * so we'll not reject it here but leave it to
 864                          * the device to not break KVM. But we warn.
 865                          */
 866                         ret = findintfep(ps->dev, index ^ 0x80);
 867                         if (ret >= 0)
 868                                 dev_info(&ps->dev->dev,
 869                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 870                                         __func__, task_pid_nr(current),
 871                                         current->comm, index, index ^ 0x80);
 872                 }
 873                 if (ret >= 0)
 874                         ret = checkintf(ps, ret);
 875                 break;
 876
 877         case USB_RECIP_INTERFACE:
 878                 ret = checkintf(ps, index);
 879                 break;
 880         }
 881         return ret;
 882 }
 883
 884 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 885                                                      unsigned char ep)
 886 {
 887         if (ep & USB_ENDPOINT_DIR_MASK)
 888                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 889         else
 890                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 891 }
 892
 893 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 894                                   struct usbdevfs_streams __user *streams,
 895                                   unsigned int *num_streams_ret,
 896                                   unsigned int *num_eps_ret,
 897                                   struct usb_host_endpoint ***eps_ret,
 898                                   struct usb_interface **intf_ret)
 899 {
 900         unsigned int i, num_streams, num_eps;
 901         struct usb_host_endpoint **eps;
 902         struct usb_interface *intf = NULL;
 903         unsigned char ep;
 904         int ifnum, ret;
 905
 906         if (get_user(num_streams, &streams->num_streams) ||
 907             get_user(num_eps, &streams->num_eps))
 908                 return -EFAULT;
 909
 910         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 911                 return -EINVAL;
 912
 913         /* The XHCI controller allows max 2 ^ 16 streams */
 914         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 915                 return -EINVAL;
 916
 917         eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
 918         if (!eps)
 919                 return -ENOMEM;
 920
 921         for (i = 0; i < num_eps; i++) {
 922                 if (get_user(ep, &streams->eps[i])) {
 923                         ret = -EFAULT;
 924                         goto error;
 925                 }
 926                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 927                 if (!eps[i]) {
 928                         ret = -EINVAL;
 929                         goto error;
 930                 }
 931
 932                 /* usb_alloc/free_streams operate on an usb_interface */
 933                 ifnum = findintfep(ps->dev, ep);
 934                 if (ifnum < 0) {
 935                         ret = ifnum;
 936                         goto error;
 937                 }
 938
 939                 if (i == 0) {
 940                         ret = checkintf(ps, ifnum);
 941                         if (ret < 0)
 942                                 goto error;
 943                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 944                 } else {
 945                         /* Verify all eps belong to the same interface */
 946                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 947                                 ret = -EINVAL;
 948                                 goto error;
 949                         }
 950                 }
 951         }
 952
 953         if (num_streams_ret)
 954                 *num_streams_ret = num_streams;
 955         *num_eps_ret = num_eps;
 956         *eps_ret = eps;
 957         *intf_ret = intf;
 958
 959         return 0;
 960
 961 error:
 962         kfree(eps);
 963         return ret;
 964 }
 965
 966 static int match_devt(struct device *dev, void *data)
 967 {
 968         return dev->devt == (dev_t) (unsigned long) data;
 969 }
 970
 971 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 972 {
 973         struct device *dev;
 974
 975         dev = bus_find_device(&usb_bus_type, NULL,
 976                               (void *) (unsigned long) devt, match_devt);
 977         if (!dev)
 978                 return NULL;
 979         return to_usb_device(dev);
 980 }
 981
 982 /*
 983  * file operations
 984  */
 985 static int usbdev_open(struct inode *inode, struct file *file)
 986 {
 987         struct usb_device *dev = NULL;
 988         struct usb_dev_state *ps;
 989         int ret;
 990
 991         ret = -ENOMEM;
 992         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
 993         if (!ps)
 994                 goto out_free_ps;
 995
 996         ret = -ENODEV;
 997
 998         /* Protect against simultaneous removal or release */
 999         mutex_lock(&usbfs_mutex);
1000
1001         /* usbdev device-node */
1002         if (imajor(inode) == USB_DEVICE_MAJOR)
1003                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1004
1005         mutex_unlock(&usbfs_mutex);
1006
1007         if (!dev)
1008                 goto out_free_ps;
1009
1010         usb_lock_device(dev);
1011         if (dev->state == USB_STATE_NOTATTACHED)
1012                 goto out_unlock_device;
1013
1014         ret = usb_autoresume_device(dev);
1015         if (ret)
1016                 goto out_unlock_device;
1017
1018         ps->dev = dev;
1019         ps->file = file;
1020         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1021         spin_lock_init(&ps->lock);
1022         INIT_LIST_HEAD(&ps->list);
1023         INIT_LIST_HEAD(&ps->async_pending);
1024         INIT_LIST_HEAD(&ps->async_completed);
1025         INIT_LIST_HEAD(&ps->memory_list);
1026         init_waitqueue_head(&ps->wait);
1027         ps->disc_pid = get_pid(task_pid(current));
1028         ps->cred = get_current_cred();
1029         security_task_getsecid(current, &ps->secid);
1030         smp_wmb();
1031         list_add_tail(&ps->list, &dev->filelist);
1032         file->private_data = ps;
1033         usb_unlock_device(dev);
1034         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1035                         current->comm);
1036         return ret;
1037
1038  out_unlock_device:
1039         usb_unlock_device(dev);
1040         usb_put_dev(dev);
1041  out_free_ps:
1042         kfree(ps);
1043         return ret;
1044 }
1045
1046 static int usbdev_release(struct inode *inode, struct file *file)
1047 {
1048         struct usb_dev_state *ps = file->private_data;
1049         struct usb_device *dev = ps->dev;
1050         unsigned int ifnum;
1051         struct async *as;
1052
1053         usb_lock_device(dev);
1054         usb_hub_release_all_ports(dev, ps);
1055
1056         list_del_init(&ps->list);
1057
1058         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1059                         ifnum++) {
1060                 if (test_bit(ifnum, &ps->ifclaimed))
1061                         releaseintf(ps, ifnum);
1062         }
1063         destroy_all_async(ps);
1064         usb_autosuspend_device(dev);
1065         usb_unlock_device(dev);
1066         usb_put_dev(dev);
1067         put_pid(ps->disc_pid);
1068         put_cred(ps->cred);
1069
1070         as = async_getcompleted(ps);
1071         while (as) {
1072                 free_async(as);
1073                 as = async_getcompleted(ps);
1074         }
1075
1076         kfree(ps);
1077         return 0;
1078 }
1079
1080 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1081 {
1082         struct usb_device *dev = ps->dev;
1083         struct usbdevfs_ctrltransfer ctrl;
1084         unsigned int tmo;
1085         unsigned char *tbuf;
1086         unsigned wLength;
1087         int i, pipe, ret;
1088
1089         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1090                 return -EFAULT;
1091         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1092                               ctrl.wIndex);
1093         if (ret)
1094                 return ret;
1095         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
1096         if (wLength > PAGE_SIZE)
1097                 return -EINVAL;
1098         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1099                         sizeof(struct usb_ctrlrequest));
1100         if (ret)
1101                 return ret;
1102         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1103         if (!tbuf) {
1104                 ret = -ENOMEM;
1105                 goto done;
1106         }
1107         tmo = ctrl.timeout;
1108         snoop(&dev->dev, "control urb: bRequestType=%02x "
1109                 "bRequest=%02x wValue=%04x "
1110                 "wIndex=%04x wLength=%04x\n",
1111                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1112                 ctrl.wIndex, ctrl.wLength);
1113         if (ctrl.bRequestType & 0x80) {
1114                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1115                                                ctrl.wLength)) {
1116                         ret = -EINVAL;
1117                         goto done;
1118                 }
1119                 pipe = usb_rcvctrlpipe(dev, 0);
1120                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1121
1122                 usb_unlock_device(dev);
1123                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1124                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1125                                     tbuf, ctrl.wLength, tmo);
1126                 usb_lock_device(dev);
1127                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1128                           tbuf, max(i, 0));
1129                 if ((i > 0) && ctrl.wLength) {
1130                         if (copy_to_user(ctrl.data, tbuf, i)) {
1131                                 ret = -EFAULT;
1132                                 goto done;
1133                         }
1134                 }
1135         } else {
1136                 if (ctrl.wLength) {
1137                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1138                                 ret = -EFAULT;
1139                                 goto done;
1140                         }
1141                 }
1142                 pipe = usb_sndctrlpipe(dev, 0);
1143                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1144                         tbuf, ctrl.wLength);
1145
1146                 usb_unlock_device(dev);
1147                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1148                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1149                                     tbuf, ctrl.wLength, tmo);
1150                 usb_lock_device(dev);
1151                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1152         }
1153         if (i < 0 && i != -EPIPE) {
1154                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1155                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1156                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1157                            ctrl.wLength, i);
1158         }
1159         ret = i;
1160  done:
1161         free_page((unsigned long) tbuf);
1162         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1163                         sizeof(struct usb_ctrlrequest));
1164         return ret;
1165 }
1166
1167 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1168 {
1169         struct usb_device *dev = ps->dev;
1170         struct usbdevfs_bulktransfer bulk;
1171         unsigned int tmo, len1, pipe;
1172         int len2;
1173         unsigned char *tbuf;
1174         int i, ret;
1175
1176         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1177                 return -EFAULT;
1178         ret = findintfep(ps->dev, bulk.ep);
1179         if (ret < 0)
1180                 return ret;
1181         ret = checkintf(ps, ret);
1182         if (ret)
1183                 return ret;
1184         if (bulk.ep & USB_DIR_IN)
1185                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1186         else
1187                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1188         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1189                 return -EINVAL;
1190         len1 = bulk.len;
1191         if (len1 >= (INT_MAX - sizeof(struct urb)))
1192                 return -EINVAL;
1193         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1194         if (ret)
1195                 return ret;
1196         tbuf = kmalloc(len1, GFP_KERNEL);
1197         if (!tbuf) {
1198                 ret = -ENOMEM;
1199                 goto done;
1200         }
1201         tmo = bulk.timeout;
1202         if (bulk.ep & 0x80) {
1203                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1204                         ret = -EINVAL;
1205                         goto done;
1206                 }
1207                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1208
1209                 usb_unlock_device(dev);
1210                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1211                 usb_lock_device(dev);
1212                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1213
1214                 if (!i && len2) {
1215                         if (copy_to_user(bulk.data, tbuf, len2)) {
1216                                 ret = -EFAULT;
1217                                 goto done;
1218                         }
1219                 }
1220         } else {
1221                 if (len1) {
1222                         if (copy_from_user(tbuf, bulk.data, len1)) {
1223                                 ret = -EFAULT;
1224                                 goto done;
1225                         }
1226                 }
1227                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1228
1229                 usb_unlock_device(dev);
1230                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1231                 usb_lock_device(dev);
1232                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1233         }
1234         ret = (i < 0 ? i : len2);
1235  done:
1236         kfree(tbuf);
1237         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1238         return ret;
1239 }
1240
1241 static void check_reset_of_active_ep(struct usb_device *udev,
1242                 unsigned int epnum, char *ioctl_name)
1243 {
1244         struct usb_host_endpoint **eps;
1245         struct usb_host_endpoint *ep;
1246
1247         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1248         ep = eps[epnum & 0x0f];
1249         if (ep && !list_empty(&ep->urb_list))
1250                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1251                                 task_pid_nr(current), current->comm,
1252                                 ioctl_name, epnum);
1253 }
1254
1255 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1256 {
1257         unsigned int ep;
1258         int ret;
1259
1260         if (get_user(ep, (unsigned int __user *)arg))
1261                 return -EFAULT;
1262         ret = findintfep(ps->dev, ep);
1263         if (ret < 0)
1264                 return ret;
1265         ret = checkintf(ps, ret);
1266         if (ret)
1267                 return ret;
1268         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1269         usb_reset_endpoint(ps->dev, ep);
1270         return 0;
1271 }
1272
1273 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1274 {
1275         unsigned int ep;
1276         int pipe;
1277         int ret;
1278
1279         if (get_user(ep, (unsigned int __user *)arg))
1280                 return -EFAULT;
1281         ret = findintfep(ps->dev, ep);
1282         if (ret < 0)
1283                 return ret;
1284         ret = checkintf(ps, ret);
1285         if (ret)
1286                 return ret;
1287         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1288         if (ep & USB_DIR_IN)
1289                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1290         else
1291                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1292
1293         return usb_clear_halt(ps->dev, pipe);
1294 }
1295
1296 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1297 {
1298         struct usbdevfs_getdriver gd;
1299         struct usb_interface *intf;
1300         int ret;
1301
1302         if (copy_from_user(&gd, arg, sizeof(gd)))
1303                 return -EFAULT;
1304         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1305         if (!intf || !intf->dev.driver)
1306                 ret = -ENODATA;
1307         else {
1308                 strlcpy(gd.driver, intf->dev.driver->name,
1309                                 sizeof(gd.driver));
1310                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1311         }
1312         return ret;
1313 }
1314
1315 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1316 {
1317         struct usbdevfs_connectinfo ci;
1318
1319         memset(&ci, 0, sizeof(ci));
1320         ci.devnum = ps->dev->devnum;
1321         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1322
1323         if (copy_to_user(arg, &ci, sizeof(ci)))
1324                 return -EFAULT;
1325         return 0;
1326 }
1327
1328 static int proc_resetdevice(struct usb_dev_state *ps)
1329 {
1330         struct usb_host_config *actconfig = ps->dev->actconfig;
1331         struct usb_interface *interface;
1332         int i, number;
1333
1334         /* Don't allow a device reset if the process has dropped the
1335          * privilege to do such things and any of the interfaces are
1336          * currently claimed.
1337          */
1338         if (ps->privileges_dropped && actconfig) {
1339                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1340                         interface = actconfig->interface[i];
1341                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1342                         if (usb_interface_claimed(interface) &&
1343                                         !test_bit(number, &ps->ifclaimed)) {
1344                                 dev_warn(&ps->dev->dev,
1345                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1346                                         number, interface->dev.driver->name, current->comm);
1347                                 return -EACCES;
1348                         }
1349                 }
1350         }
1351
1352         return usb_reset_device(ps->dev);
1353 }
1354
1355 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1356 {
1357         struct usbdevfs_setinterface setintf;
1358         int ret;
1359
1360         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1361                 return -EFAULT;
1362         ret = checkintf(ps, setintf.interface);
1363         if (ret)
1364                 return ret;
1365
1366         destroy_async_on_interface(ps, setintf.interface);
1367
1368         return usb_set_interface(ps->dev, setintf.interface,
1369                         setintf.altsetting);
1370 }
1371
1372 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1373 {
1374         int u;
1375         int status = 0;
1376         struct usb_host_config *actconfig;
1377
1378         if (get_user(u, (int __user *)arg))
1379                 return -EFAULT;
1380
1381         actconfig = ps->dev->actconfig;
1382
1383         /* Don't touch the device if any interfaces are claimed.
1384          * It could interfere with other drivers' operations, and if
1385          * an interface is claimed by usbfs it could easily deadlock.
1386          */
1387         if (actconfig) {
1388                 int i;
1389
1390                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1391                         if (usb_interface_claimed(actconfig->interface[i])) {
1392                                 dev_warn(&ps->dev->dev,
1393                                         "usbfs: interface %d claimed by %s "
1394                                         "while '%s' sets config #%d\n",
1395                                         actconfig->interface[i]
1396                                                 ->cur_altsetting
1397                                                 ->desc.bInterfaceNumber,
1398                                         actconfig->interface[i]
1399                                                 ->dev.driver->name,
1400                                         current->comm, u);
1401                                 status = -EBUSY;
1402                                 break;
1403                         }
1404                 }
1405         }
1406
1407         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1408          * so avoid usb_set_configuration()'s kick to sysfs
1409          */
1410         if (status == 0) {
1411                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1412                         status = usb_reset_configuration(ps->dev);
1413                 else
1414                         status = usb_set_configuration(ps->dev, u);
1415         }
1416
1417         return status;
1418 }
1419
1420 static struct usb_memory *
1421 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1422 {
1423         struct usb_memory *usbm = NULL, *iter;
1424         unsigned long flags;
1425         unsigned long uurb_start = (unsigned long)uurb->buffer;
1426
1427         spin_lock_irqsave(&ps->lock, flags);
1428         list_for_each_entry(iter, &ps->memory_list, memlist) {
1429                 if (uurb_start >= iter->vm_start &&
1430                                 uurb_start < iter->vm_start + iter->size) {
1431                         if (uurb->buffer_length > iter->vm_start + iter->size -
1432                                         uurb_start) {
1433                                 usbm = ERR_PTR(-EINVAL);
1434                         } else {
1435                                 usbm = iter;
1436                                 usbm->urb_use_count++;
1437                         }
1438                         break;
1439                 }
1440         }
1441         spin_unlock_irqrestore(&ps->lock, flags);
1442         return usbm;
1443 }
1444
1445 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1446                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1447                         void __user *arg)
1448 {
1449         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1450         struct usb_host_endpoint *ep;
1451         struct async *as = NULL;
1452         struct usb_ctrlrequest *dr = NULL;
1453         unsigned int u, totlen, isofrmlen;
1454         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1455         int number_of_packets = 0;
1456         unsigned int stream_id = 0;
1457         void *buf;
1458
1459         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1460                                 USBDEVFS_URB_SHORT_NOT_OK |
1461                                 USBDEVFS_URB_BULK_CONTINUATION |
1462                                 USBDEVFS_URB_NO_FSBR |
1463                                 USBDEVFS_URB_ZERO_PACKET |
1464                                 USBDEVFS_URB_NO_INTERRUPT))
1465                 return -EINVAL;
1466         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1467                 return -EINVAL;
1468         if (uurb->buffer_length > 0 && !uurb->buffer)
1469                 return -EINVAL;
1470         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1471             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1472                 ifnum = findintfep(ps->dev, uurb->endpoint);
1473                 if (ifnum < 0)
1474                         return ifnum;
1475                 ret = checkintf(ps, ifnum);
1476                 if (ret)
1477                         return ret;
1478         }
1479         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1480         if (!ep)
1481                 return -ENOENT;
1482         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1483
1484         u = 0;
1485         switch (uurb->type) {
1486         case USBDEVFS_URB_TYPE_CONTROL:
1487                 if (!usb_endpoint_xfer_control(&ep->desc))
1488                         return -EINVAL;
1489                 /* min 8 byte setup packet */
1490                 if (uurb->buffer_length < 8)
1491                         return -EINVAL;
1492                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1493                 if (!dr)
1494                         return -ENOMEM;
1495                 if (copy_from_user(dr, uurb->buffer, 8)) {
1496                         ret = -EFAULT;
1497                         goto error;
1498                 }
1499                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1500                         ret = -EINVAL;
1501                         goto error;
1502                 }
1503                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1504                                       le16_to_cpup(&dr->wIndex));
1505                 if (ret)
1506                         goto error;
1507                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1508                 uurb->buffer += 8;
1509                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1510                         is_in = 1;
1511                         uurb->endpoint |= USB_DIR_IN;
1512                 } else {
1513                         is_in = 0;
1514                         uurb->endpoint &= ~USB_DIR_IN;
1515                 }
1516                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1517                         "bRequest=%02x wValue=%04x "
1518                         "wIndex=%04x wLength=%04x\n",
1519                         dr->bRequestType, dr->bRequest,
1520                         __le16_to_cpup(&dr->wValue),
1521                         __le16_to_cpup(&dr->wIndex),
1522                         __le16_to_cpup(&dr->wLength));
1523                 u = sizeof(struct usb_ctrlrequest);
1524                 break;
1525
1526         case USBDEVFS_URB_TYPE_BULK:
1527                 switch (usb_endpoint_type(&ep->desc)) {
1528                 case USB_ENDPOINT_XFER_CONTROL:
1529                 case USB_ENDPOINT_XFER_ISOC:
1530                         return -EINVAL;
1531                 case USB_ENDPOINT_XFER_INT:
1532                         /* allow single-shot interrupt transfers */
1533                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1534                         goto interrupt_urb;
1535                 }
1536                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1537                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1538                         num_sgs = 0;
1539                 if (ep->streams)
1540                         stream_id = uurb->stream_id;
1541                 break;
1542
1543         case USBDEVFS_URB_TYPE_INTERRUPT:
1544                 if (!usb_endpoint_xfer_int(&ep->desc))
1545                         return -EINVAL;
1546  interrupt_urb:
1547                 break;
1548
1549         case USBDEVFS_URB_TYPE_ISO:
1550                 /* arbitrary limit */
1551                 if (uurb->number_of_packets < 1 ||
1552                     uurb->number_of_packets > 128)
1553                         return -EINVAL;
1554                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1555                         return -EINVAL;
1556                 number_of_packets = uurb->number_of_packets;
1557                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1558                                    number_of_packets;
1559                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1560                 if (IS_ERR(isopkt)) {
1561                         ret = PTR_ERR(isopkt);
1562                         isopkt = NULL;
1563                         goto error;
1564                 }
1565                 for (totlen = u = 0; u < number_of_packets; u++) {
1566                         /*
1567                          * arbitrary limit need for USB 3.0
1568                          * bMaxBurst (0~15 allowed, 1~16 packets)
1569                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1570                          * sizemax: 1024 * 16 * 3 = 49152
1571                          */
1572                         if (isopkt[u].length > 49152) {
1573                                 ret = -EINVAL;
1574                                 goto error;
1575                         }
1576                         totlen += isopkt[u].length;
1577                 }
1578                 u *= sizeof(struct usb_iso_packet_descriptor);
1579                 if (totlen <= uurb->buffer_length)
1580                         uurb->buffer_length = totlen;
1581                 else
1582                         WARN_ONCE(1, "uurb->buffer_length is too short %d vs %d",
1583                                   totlen, uurb->buffer_length);
1584                 break;
1585
1586         default:
1587                 return -EINVAL;
1588         }
1589
1590         if (uurb->buffer_length > 0 &&
1591                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1592                                 uurb->buffer, uurb->buffer_length)) {
1593                 ret = -EFAULT;
1594                 goto error;
1595         }
1596         as = alloc_async(number_of_packets);
1597         if (!as) {
1598                 ret = -ENOMEM;
1599                 goto error;
1600         }
1601
1602         as->usbm = find_memory_area(ps, uurb);
1603         if (IS_ERR(as->usbm)) {
1604                 ret = PTR_ERR(as->usbm);
1605                 as->usbm = NULL;
1606                 goto error;
1607         }
1608
1609         /* do not use SG buffers when memory mapped segments
1610          * are in use
1611          */
1612         if (as->usbm)
1613                 num_sgs = 0;
1614
1615         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1616              num_sgs * sizeof(struct scatterlist);
1617         ret = usbfs_increase_memory_usage(u);
1618         if (ret)
1619                 goto error;
1620         as->mem_usage = u;
1621
1622         if (num_sgs) {
1623                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1624                                       GFP_KERNEL);
1625                 if (!as->urb->sg) {
1626                         ret = -ENOMEM;
1627                         goto error;
1628                 }
1629                 as->urb->num_sgs = num_sgs;
1630                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1631
1632                 totlen = uurb->buffer_length;
1633                 for (i = 0; i < as->urb->num_sgs; i++) {
1634                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1635                         buf = kmalloc(u, GFP_KERNEL);
1636                         if (!buf) {
1637                                 ret = -ENOMEM;
1638                                 goto error;
1639                         }
1640                         sg_set_buf(&as->urb->sg[i], buf, u);
1641
1642                         if (!is_in) {
1643                                 if (copy_from_user(buf, uurb->buffer, u)) {
1644                                         ret = -EFAULT;
1645                                         goto error;
1646                                 }
1647                                 uurb->buffer += u;
1648                         }
1649                         totlen -= u;
1650                 }
1651         } else if (uurb->buffer_length > 0) {
1652                 if (as->usbm) {
1653                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1654
1655                         as->urb->transfer_buffer = as->usbm->mem +
1656                                         (uurb_start - as->usbm->vm_start);
1657                 } else {
1658                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1659                                         GFP_KERNEL);
1660                         if (!as->urb->transfer_buffer) {
1661                                 ret = -ENOMEM;
1662                                 goto error;
1663                         }
1664                         if (!is_in) {
1665                                 if (copy_from_user(as->urb->transfer_buffer,
1666                                                    uurb->buffer,
1667                                                    uurb->buffer_length)) {
1668                                         ret = -EFAULT;
1669                                         goto error;
1670                                 }
1671                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1672                                 /*
1673                                  * Isochronous input data may end up being
1674                                  * discontiguous if some of the packets are
1675                                  * short. Clear the buffer so that the gaps
1676                                  * don't leak kernel data to userspace.
1677                                  */
1678                                 memset(as->urb->transfer_buffer, 0,
1679                                                 uurb->buffer_length);
1680                         }
1681                 }
1682         }
1683         as->urb->dev = ps->dev;
1684         as->urb->pipe = (uurb->type << 30) |
1685                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1686                         (uurb->endpoint & USB_DIR_IN);
1687
1688         /* This tedious sequence is necessary because the URB_* flags
1689          * are internal to the kernel and subject to change, whereas
1690          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1691          */
1692         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1693         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1694                 u |= URB_ISO_ASAP;
1695         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1696                 u |= URB_SHORT_NOT_OK;
1697         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1698                 u |= URB_NO_FSBR;
1699         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1700                 u |= URB_ZERO_PACKET;
1701         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1702                 u |= URB_NO_INTERRUPT;
1703         as->urb->transfer_flags = u;
1704
1705         as->urb->transfer_buffer_length = uurb->buffer_length;
1706         as->urb->setup_packet = (unsigned char *)dr;
1707         dr = NULL;
1708         as->urb->start_frame = uurb->start_frame;
1709         as->urb->number_of_packets = number_of_packets;
1710         as->urb->stream_id = stream_id;
1711
1712         if (ep->desc.bInterval) {
1713                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1714                                 ps->dev->speed == USB_SPEED_HIGH ||
1715                                 ps->dev->speed >= USB_SPEED_SUPER)
1716                         as->urb->interval = 1 <<
1717                                         min(15, ep->desc.bInterval - 1);
1718                 else
1719                         as->urb->interval = ep->desc.bInterval;
1720         }
1721
1722         as->urb->context = as;
1723         as->urb->complete = async_completed;
1724         for (totlen = u = 0; u < number_of_packets; u++) {
1725                 as->urb->iso_frame_desc[u].offset = totlen;
1726                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1727                 totlen += isopkt[u].length;
1728         }
1729         kfree(isopkt);
1730         isopkt = NULL;
1731         as->ps = ps;
1732         as->userurb = arg;
1733         if (as->usbm) {
1734                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1735
1736                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1737                 as->urb->transfer_dma = as->usbm->dma_handle +
1738                                 (uurb_start - as->usbm->vm_start);
1739         } else if (is_in && uurb->buffer_length > 0)
1740                 as->userbuffer = uurb->buffer;
1741         as->signr = uurb->signr;
1742         as->ifnum = ifnum;
1743         as->pid = get_pid(task_pid(current));
1744         as->cred = get_current_cred();
1745         security_task_getsecid(current, &as->secid);
1746         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1747                         as->urb->transfer_buffer_length, 0, SUBMIT,
1748                         NULL, 0);
1749         if (!is_in)
1750                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1751
1752         async_newpending(as);
1753
1754         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1755                 spin_lock_irq(&ps->lock);
1756
1757                 /* Not exactly the endpoint address; the direction bit is
1758                  * shifted to the 0x10 position so that the value will be
1759                  * between 0 and 31.
1760                  */
1761                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1762                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1763                                 >> 3);
1764
1765                 /* If this bulk URB is the start of a new transfer, re-enable
1766                  * the endpoint.  Otherwise mark it as a continuation URB.
1767                  */
1768                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1769                         as->bulk_status = AS_CONTINUATION;
1770                 else
1771                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1772
1773                 /* Don't accept continuation URBs if the endpoint is
1774                  * disabled because of an earlier error.
1775                  */
1776                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1777                         ret = -EREMOTEIO;
1778                 else
1779                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1780                 spin_unlock_irq(&ps->lock);
1781         } else {
1782                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1783         }
1784
1785         if (ret) {
1786                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1787                            "usbfs: usb_submit_urb returned %d\n", ret);
1788                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1789                                 0, ret, COMPLETE, NULL, 0);
1790                 async_removepending(as);
1791                 goto error;
1792         }
1793         return 0;
1794
1795  error:
1796         if (as && as->usbm)
1797                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1798         kfree(isopkt);
1799         kfree(dr);
1800         if (as)
1801                 free_async(as);
1802         return ret;
1803 }
1804
1805 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1806 {
1807         struct usbdevfs_urb uurb;
1808
1809         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1810                 return -EFAULT;
1811
1812         return proc_do_submiturb(ps, &uurb,
1813                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1814                         arg);
1815 }
1816
1817 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1818 {
1819         struct urb *urb;
1820         struct async *as;
1821         unsigned long flags;
1822
1823         spin_lock_irqsave(&ps->lock, flags);
1824         as = async_getpending(ps, arg);
1825         if (!as) {
1826                 spin_unlock_irqrestore(&ps->lock, flags);
1827                 return -EINVAL;
1828         }
1829
1830         urb = as->urb;
1831         usb_get_urb(urb);
1832         spin_unlock_irqrestore(&ps->lock, flags);
1833
1834         usb_kill_urb(urb);
1835         usb_put_urb(urb);
1836
1837         return 0;
1838 }
1839
1840 static int processcompl(struct async *as, void __user * __user *arg)
1841 {
1842         struct urb *urb = as->urb;
1843         struct usbdevfs_urb __user *userurb = as->userurb;
1844         void __user *addr = as->userurb;
1845         unsigned int i;
1846
1847         if (as->userbuffer && urb->actual_length) {
1848                 if (copy_urb_data_to_user(as->userbuffer, urb))
1849                         goto err_out;
1850         }
1851         if (put_user(as->status, &userurb->status))
1852                 goto err_out;
1853         if (put_user(urb->actual_length, &userurb->actual_length))
1854                 goto err_out;
1855         if (put_user(urb->error_count, &userurb->error_count))
1856                 goto err_out;
1857
1858         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1859                 for (i = 0; i < urb->number_of_packets; i++) {
1860                         if (put_user(urb->iso_frame_desc[i].actual_length,
1861                                      &userurb->iso_frame_desc[i].actual_length))
1862                                 goto err_out;
1863                         if (put_user(urb->iso_frame_desc[i].status,
1864                                      &userurb->iso_frame_desc[i].status))
1865                                 goto err_out;
1866                 }
1867         }
1868
1869         if (put_user(addr, (void __user * __user *)arg))
1870                 return -EFAULT;
1871         return 0;
1872
1873 err_out:
1874         return -EFAULT;
1875 }
1876
1877 static struct async *reap_as(struct usb_dev_state *ps)
1878 {
1879         DECLARE_WAITQUEUE(wait, current);
1880         struct async *as = NULL;
1881         struct usb_device *dev = ps->dev;
1882
1883         add_wait_queue(&ps->wait, &wait);
1884         for (;;) {
1885                 __set_current_state(TASK_INTERRUPTIBLE);
1886                 as = async_getcompleted(ps);
1887                 if (as || !connected(ps))
1888                         break;
1889                 if (signal_pending(current))
1890                         break;
1891                 usb_unlock_device(dev);
1892                 schedule();
1893                 usb_lock_device(dev);
1894         }
1895         remove_wait_queue(&ps->wait, &wait);
1896         set_current_state(TASK_RUNNING);
1897         return as;
1898 }
1899
1900 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1901 {
1902         struct async *as = reap_as(ps);
1903
1904         if (as) {
1905                 int retval;
1906
1907                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1908                 retval = processcompl(as, (void __user * __user *)arg);
1909                 free_async(as);
1910                 return retval;
1911         }
1912         if (signal_pending(current))
1913                 return -EINTR;
1914         return -ENODEV;
1915 }
1916
1917 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1918 {
1919         int retval;
1920         struct async *as;
1921
1922         as = async_getcompleted(ps);
1923         if (as) {
1924                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1925                 retval = processcompl(as, (void __user * __user *)arg);
1926                 free_async(as);
1927         } else {
1928                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1929         }
1930         return retval;
1931 }
1932
1933 #ifdef CONFIG_COMPAT
1934 static int proc_control_compat(struct usb_dev_state *ps,
1935                                 struct usbdevfs_ctrltransfer32 __user *p32)
1936 {
1937         struct usbdevfs_ctrltransfer __user *p;
1938         __u32 udata;
1939         p = compat_alloc_user_space(sizeof(*p));
1940         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1941             get_user(udata, &p32->data) ||
1942             put_user(compat_ptr(udata), &p->data))
1943                 return -EFAULT;
1944         return proc_control(ps, p);
1945 }
1946
1947 static int proc_bulk_compat(struct usb_dev_state *ps,
1948                         struct usbdevfs_bulktransfer32 __user *p32)
1949 {
1950         struct usbdevfs_bulktransfer __user *p;
1951         compat_uint_t n;
1952         compat_caddr_t addr;
1953
1954         p = compat_alloc_user_space(sizeof(*p));
1955
1956         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1957             get_user(n, &p32->len) || put_user(n, &p->len) ||
1958             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1959             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1960                 return -EFAULT;
1961
1962         return proc_bulk(ps, p);
1963 }
1964 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1965 {
1966         struct usbdevfs_disconnectsignal32 ds;
1967
1968         if (copy_from_user(&ds, arg, sizeof(ds)))
1969                 return -EFAULT;
1970         ps->discsignr = ds.signr;
1971         ps->disccontext = compat_ptr(ds.context);
1972         return 0;
1973 }
1974
1975 static int get_urb32(struct usbdevfs_urb *kurb,
1976                      struct usbdevfs_urb32 __user *uurb)
1977 {
1978         struct usbdevfs_urb32 urb32;
1979         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
1980                 return -EFAULT;
1981         kurb->type = urb32.type;
1982         kurb->endpoint = urb32.endpoint;
1983         kurb->status = urb32.status;
1984         kurb->flags = urb32.flags;
1985         kurb->buffer = compat_ptr(urb32.buffer);
1986         kurb->buffer_length = urb32.buffer_length;
1987         kurb->actual_length = urb32.actual_length;
1988         kurb->start_frame = urb32.start_frame;
1989         kurb->number_of_packets = urb32.number_of_packets;
1990         kurb->error_count = urb32.error_count;
1991         kurb->signr = urb32.signr;
1992         kurb->usercontext = compat_ptr(urb32.usercontext);
1993         return 0;
1994 }
1995
1996 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1997 {
1998         struct usbdevfs_urb uurb;
1999
2000         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2001                 return -EFAULT;
2002
2003         return proc_do_submiturb(ps, &uurb,
2004                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2005                         arg);
2006 }
2007
2008 static int processcompl_compat(struct async *as, void __user * __user *arg)
2009 {
2010         struct urb *urb = as->urb;
2011         struct usbdevfs_urb32 __user *userurb = as->userurb;
2012         void __user *addr = as->userurb;
2013         unsigned int i;
2014
2015         if (as->userbuffer && urb->actual_length) {
2016                 if (copy_urb_data_to_user(as->userbuffer, urb))
2017                         return -EFAULT;
2018         }
2019         if (put_user(as->status, &userurb->status))
2020                 return -EFAULT;
2021         if (put_user(urb->actual_length, &userurb->actual_length))
2022                 return -EFAULT;
2023         if (put_user(urb->error_count, &userurb->error_count))
2024                 return -EFAULT;
2025
2026         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2027                 for (i = 0; i < urb->number_of_packets; i++) {
2028                         if (put_user(urb->iso_frame_desc[i].actual_length,
2029                                      &userurb->iso_frame_desc[i].actual_length))
2030                                 return -EFAULT;
2031                         if (put_user(urb->iso_frame_desc[i].status,
2032                                      &userurb->iso_frame_desc[i].status))
2033                                 return -EFAULT;
2034                 }
2035         }
2036
2037         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2038                 return -EFAULT;
2039         return 0;
2040 }
2041
2042 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2043 {
2044         struct async *as = reap_as(ps);
2045
2046         if (as) {
2047                 int retval;
2048
2049                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2050                 retval = processcompl_compat(as, (void __user * __user *)arg);
2051                 free_async(as);
2052                 return retval;
2053         }
2054         if (signal_pending(current))
2055                 return -EINTR;
2056         return -ENODEV;
2057 }
2058
2059 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2060 {
2061         int retval;
2062         struct async *as;
2063
2064         as = async_getcompleted(ps);
2065         if (as) {
2066                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2067                 retval = processcompl_compat(as, (void __user * __user *)arg);
2068                 free_async(as);
2069         } else {
2070                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2071         }
2072         return retval;
2073 }
2074
2075
2076 #endif
2077
2078 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2079 {
2080         struct usbdevfs_disconnectsignal ds;
2081
2082         if (copy_from_user(&ds, arg, sizeof(ds)))
2083                 return -EFAULT;
2084         ps->discsignr = ds.signr;
2085         ps->disccontext = ds.context;
2086         return 0;
2087 }
2088
2089 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2090 {
2091         unsigned int ifnum;
2092
2093         if (get_user(ifnum, (unsigned int __user *)arg))
2094                 return -EFAULT;
2095         return claimintf(ps, ifnum);
2096 }
2097
2098 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2099 {
2100         unsigned int ifnum;
2101         int ret;
2102
2103         if (get_user(ifnum, (unsigned int __user *)arg))
2104                 return -EFAULT;
2105         ret = releaseintf(ps, ifnum);
2106         if (ret < 0)
2107                 return ret;
2108         destroy_async_on_interface(ps, ifnum);
2109         return 0;
2110 }
2111
2112 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2113 {
2114         int                     size;
2115         void                    *buf = NULL;
2116         int                     retval = 0;
2117         struct usb_interface    *intf = NULL;
2118         struct usb_driver       *driver = NULL;
2119
2120         if (ps->privileges_dropped)
2121                 return -EACCES;
2122
2123         /* alloc buffer */
2124         size = _IOC_SIZE(ctl->ioctl_code);
2125         if (size > 0) {
2126                 buf = kmalloc(size, GFP_KERNEL);
2127                 if (buf == NULL)
2128                         return -ENOMEM;
2129                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2130                         if (copy_from_user(buf, ctl->data, size)) {
2131                                 kfree(buf);
2132                                 return -EFAULT;
2133                         }
2134                 } else {
2135                         memset(buf, 0, size);
2136                 }
2137         }
2138
2139         if (!connected(ps)) {
2140                 kfree(buf);
2141                 return -ENODEV;
2142         }
2143
2144         if (ps->dev->state != USB_STATE_CONFIGURED)
2145                 retval = -EHOSTUNREACH;
2146         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2147                 retval = -EINVAL;
2148         else switch (ctl->ioctl_code) {
2149
2150         /* disconnect kernel driver from interface */
2151         case USBDEVFS_DISCONNECT:
2152                 if (intf->dev.driver) {
2153                         driver = to_usb_driver(intf->dev.driver);
2154                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2155                         usb_driver_release_interface(driver, intf);
2156                 } else
2157                         retval = -ENODATA;
2158                 break;
2159
2160         /* let kernel drivers try to (re)bind to the interface */
2161         case USBDEVFS_CONNECT:
2162                 if (!intf->dev.driver)
2163                         retval = device_attach(&intf->dev);
2164                 else
2165                         retval = -EBUSY;
2166                 break;
2167
2168         /* talk directly to the interface's driver */
2169         default:
2170                 if (intf->dev.driver)
2171                         driver = to_usb_driver(intf->dev.driver);
2172                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2173                         retval = -ENOTTY;
2174                 } else {
2175                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2176                         if (retval == -ENOIOCTLCMD)
2177                                 retval = -ENOTTY;
2178                 }
2179         }
2180
2181         /* cleanup and return */
2182         if (retval >= 0
2183                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2184                         && size > 0
2185                         && copy_to_user(ctl->data, buf, size) != 0)
2186                 retval = -EFAULT;
2187
2188         kfree(buf);
2189         return retval;
2190 }
2191
2192 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2193 {
2194         struct usbdevfs_ioctl   ctrl;
2195
2196         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2197                 return -EFAULT;
2198         return proc_ioctl(ps, &ctrl);
2199 }
2200
2201 #ifdef CONFIG_COMPAT
2202 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2203 {
2204         struct usbdevfs_ioctl32 ioc32;
2205         struct usbdevfs_ioctl ctrl;
2206
2207         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2208                 return -EFAULT;
2209         ctrl.ifno = ioc32.ifno;
2210         ctrl.ioctl_code = ioc32.ioctl_code;
2211         ctrl.data = compat_ptr(ioc32.data);
2212         return proc_ioctl(ps, &ctrl);
2213 }
2214 #endif
2215
2216 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2217 {
2218         unsigned portnum;
2219         int rc;
2220
2221         if (get_user(portnum, (unsigned __user *) arg))
2222                 return -EFAULT;
2223         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2224         if (rc == 0)
2225                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2226                         portnum, task_pid_nr(current), current->comm);
2227         return rc;
2228 }
2229
2230 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2231 {
2232         unsigned portnum;
2233
2234         if (get_user(portnum, (unsigned __user *) arg))
2235                 return -EFAULT;
2236         return usb_hub_release_port(ps->dev, portnum, ps);
2237 }
2238
2239 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2240 {
2241         __u32 caps;
2242
2243         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2244                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2245                         USBDEVFS_CAP_DROP_PRIVILEGES;
2246         if (!ps->dev->bus->no_stop_on_short)
2247                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2248         if (ps->dev->bus->sg_tablesize)
2249                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2250
2251         if (put_user(caps, (__u32 __user *)arg))
2252                 return -EFAULT;
2253
2254         return 0;
2255 }
2256
2257 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2258 {
2259         struct usbdevfs_disconnect_claim dc;
2260         struct usb_interface *intf;
2261
2262         if (copy_from_user(&dc, arg, sizeof(dc)))
2263                 return -EFAULT;
2264
2265         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2266         if (!intf)
2267                 return -EINVAL;
2268
2269         if (intf->dev.driver) {
2270                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2271
2272                 if (ps->privileges_dropped)
2273                         return -EACCES;
2274
2275                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2276                                 strncmp(dc.driver, intf->dev.driver->name,
2277                                         sizeof(dc.driver)) != 0)
2278                         return -EBUSY;
2279
2280                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2281                                 strncmp(dc.driver, intf->dev.driver->name,
2282                                         sizeof(dc.driver)) == 0)
2283                         return -EBUSY;
2284
2285                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2286                 usb_driver_release_interface(driver, intf);
2287         }
2288
2289         return claimintf(ps, dc.interface);
2290 }
2291
2292 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2293 {
2294         unsigned num_streams, num_eps;
2295         struct usb_host_endpoint **eps;
2296         struct usb_interface *intf;
2297         int r;
2298
2299         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2300                                    &eps, &intf);
2301         if (r)
2302                 return r;
2303
2304         destroy_async_on_interface(ps,
2305                                    intf->altsetting[0].desc.bInterfaceNumber);
2306
2307         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2308         kfree(eps);
2309         return r;
2310 }
2311
2312 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2313 {
2314         unsigned num_eps;
2315         struct usb_host_endpoint **eps;
2316         struct usb_interface *intf;
2317         int r;
2318
2319         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2320         if (r)
2321                 return r;
2322
2323         destroy_async_on_interface(ps,
2324                                    intf->altsetting[0].desc.bInterfaceNumber);
2325
2326         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2327         kfree(eps);
2328         return r;
2329 }
2330
2331 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2332 {
2333         u32 data;
2334
2335         if (copy_from_user(&data, arg, sizeof(data)))
2336                 return -EFAULT;
2337
2338         /* This is a one way operation. Once privileges are
2339          * dropped, you cannot regain them. You may however reissue
2340          * this ioctl to shrink the allowed interfaces mask.
2341          */
2342         ps->interface_allowed_mask &= data;
2343         ps->privileges_dropped = true;
2344
2345         return 0;
2346 }
2347
2348 /*
2349  * NOTE:  All requests here that have interface numbers as parameters
2350  * are assuming that somehow the configuration has been prevented from
2351  * changing.  But there's no mechanism to ensure that...
2352  */
2353 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2354                                 void __user *p)
2355 {
2356         struct usb_dev_state *ps = file->private_data;
2357         struct inode *inode = file_inode(file);
2358         struct usb_device *dev = ps->dev;
2359         int ret = -ENOTTY;
2360
2361         if (!(file->f_mode & FMODE_WRITE))
2362                 return -EPERM;
2363
2364         usb_lock_device(dev);
2365
2366         /* Reap operations are allowed even after disconnection */
2367         switch (cmd) {
2368         case USBDEVFS_REAPURB:
2369                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2370                 ret = proc_reapurb(ps, p);
2371                 goto done;
2372
2373         case USBDEVFS_REAPURBNDELAY:
2374                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2375                 ret = proc_reapurbnonblock(ps, p);
2376                 goto done;
2377
2378 #ifdef CONFIG_COMPAT
2379         case USBDEVFS_REAPURB32:
2380                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2381                 ret = proc_reapurb_compat(ps, p);
2382                 goto done;
2383
2384         case USBDEVFS_REAPURBNDELAY32:
2385                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2386                 ret = proc_reapurbnonblock_compat(ps, p);
2387                 goto done;
2388 #endif
2389         }
2390
2391         if (!connected(ps)) {
2392                 usb_unlock_device(dev);
2393                 return -ENODEV;
2394         }
2395
2396         switch (cmd) {
2397         case USBDEVFS_CONTROL:
2398                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2399                 ret = proc_control(ps, p);
2400                 if (ret >= 0)
2401                         inode->i_mtime = current_time(inode);
2402                 break;
2403
2404         case USBDEVFS_BULK:
2405                 snoop(&dev->dev, "%s: BULK\n", __func__);
2406                 ret = proc_bulk(ps, p);
2407                 if (ret >= 0)
2408                         inode->i_mtime = current_time(inode);
2409                 break;
2410
2411         case USBDEVFS_RESETEP:
2412                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2413                 ret = proc_resetep(ps, p);
2414                 if (ret >= 0)
2415                         inode->i_mtime = current_time(inode);
2416                 break;
2417
2418         case USBDEVFS_RESET:
2419                 snoop(&dev->dev, "%s: RESET\n", __func__);
2420                 ret = proc_resetdevice(ps);
2421                 break;
2422
2423         case USBDEVFS_CLEAR_HALT:
2424                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2425                 ret = proc_clearhalt(ps, p);
2426                 if (ret >= 0)
2427                         inode->i_mtime = current_time(inode);
2428                 break;
2429
2430         case USBDEVFS_GETDRIVER:
2431                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2432                 ret = proc_getdriver(ps, p);
2433                 break;
2434
2435         case USBDEVFS_CONNECTINFO:
2436                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2437                 ret = proc_connectinfo(ps, p);
2438                 break;
2439
2440         case USBDEVFS_SETINTERFACE:
2441                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2442                 ret = proc_setintf(ps, p);
2443                 break;
2444
2445         case USBDEVFS_SETCONFIGURATION:
2446                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2447                 ret = proc_setconfig(ps, p);
2448                 break;
2449
2450         case USBDEVFS_SUBMITURB:
2451                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2452                 ret = proc_submiturb(ps, p);
2453                 if (ret >= 0)
2454                         inode->i_mtime = current_time(inode);
2455                 break;
2456
2457 #ifdef CONFIG_COMPAT
2458         case USBDEVFS_CONTROL32:
2459                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2460                 ret = proc_control_compat(ps, p);
2461                 if (ret >= 0)
2462                         inode->i_mtime = current_time(inode);
2463                 break;
2464
2465         case USBDEVFS_BULK32:
2466                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2467                 ret = proc_bulk_compat(ps, p);
2468                 if (ret >= 0)
2469                         inode->i_mtime = current_time(inode);
2470                 break;
2471
2472         case USBDEVFS_DISCSIGNAL32:
2473                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2474                 ret = proc_disconnectsignal_compat(ps, p);
2475                 break;
2476
2477         case USBDEVFS_SUBMITURB32:
2478                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2479                 ret = proc_submiturb_compat(ps, p);
2480                 if (ret >= 0)
2481                         inode->i_mtime = current_time(inode);
2482                 break;
2483
2484         case USBDEVFS_IOCTL32:
2485                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2486                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2487                 break;
2488 #endif
2489
2490         case USBDEVFS_DISCARDURB:
2491                 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2492                 ret = proc_unlinkurb(ps, p);
2493                 break;
2494
2495         case USBDEVFS_DISCSIGNAL:
2496                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2497                 ret = proc_disconnectsignal(ps, p);
2498                 break;
2499
2500         case USBDEVFS_CLAIMINTERFACE:
2501                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2502                 ret = proc_claiminterface(ps, p);
2503                 break;
2504
2505         case USBDEVFS_RELEASEINTERFACE:
2506                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2507                 ret = proc_releaseinterface(ps, p);
2508                 break;
2509
2510         case USBDEVFS_IOCTL:
2511                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2512                 ret = proc_ioctl_default(ps, p);
2513                 break;
2514
2515         case USBDEVFS_CLAIM_PORT:
2516                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2517                 ret = proc_claim_port(ps, p);
2518                 break;
2519
2520         case USBDEVFS_RELEASE_PORT:
2521                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2522                 ret = proc_release_port(ps, p);
2523                 break;
2524         case USBDEVFS_GET_CAPABILITIES:
2525                 ret = proc_get_capabilities(ps, p);
2526                 break;
2527         case USBDEVFS_DISCONNECT_CLAIM:
2528                 ret = proc_disconnect_claim(ps, p);
2529                 break;
2530         case USBDEVFS_ALLOC_STREAMS:
2531                 ret = proc_alloc_streams(ps, p);
2532                 break;
2533         case USBDEVFS_FREE_STREAMS:
2534                 ret = proc_free_streams(ps, p);
2535                 break;
2536         case USBDEVFS_DROP_PRIVILEGES:
2537                 ret = proc_drop_privileges(ps, p);
2538                 break;
2539         case USBDEVFS_GET_SPEED:
2540                 ret = ps->dev->speed;
2541                 break;
2542         }
2543
2544  done:
2545         usb_unlock_device(dev);
2546         if (ret >= 0)
2547                 inode->i_atime = current_time(inode);
2548         return ret;
2549 }
2550
2551 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2552                         unsigned long arg)
2553 {
2554         int ret;
2555
2556         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2557
2558         return ret;
2559 }
2560
2561 #ifdef CONFIG_COMPAT
2562 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2563                         unsigned long arg)
2564 {
2565         int ret;
2566
2567         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2568
2569         return ret;
2570 }
2571 #endif
2572
2573 /* No kernel lock - fine */
2574 static unsigned int usbdev_poll(struct file *file,
2575                                 struct poll_table_struct *wait)
2576 {
2577         struct usb_dev_state *ps = file->private_data;
2578         unsigned int mask = 0;
2579
2580         poll_wait(file, &ps->wait, wait);
2581         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2582                 mask |= POLLOUT | POLLWRNORM;
2583         if (!connected(ps))
2584                 mask |= POLLHUP;
2585         if (list_empty(&ps->list))
2586                 mask |= POLLERR;
2587         return mask;
2588 }
2589
2590 const struct file_operations usbdev_file_operations = {
2591         .owner =          THIS_MODULE,
2592         .llseek =         no_seek_end_llseek,
2593         .read =           usbdev_read,
2594         .poll =           usbdev_poll,
2595         .unlocked_ioctl = usbdev_ioctl,
2596 #ifdef CONFIG_COMPAT
2597         .compat_ioctl =   usbdev_compat_ioctl,
2598 #endif
2599         .mmap =           usbdev_mmap,
2600         .open =           usbdev_open,
2601         .release =        usbdev_release,
2602 };
2603
2604 static void usbdev_remove(struct usb_device *udev)
2605 {
2606         struct usb_dev_state *ps;
2607         struct siginfo sinfo;
2608
2609         while (!list_empty(&udev->filelist)) {
2610                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2611                 destroy_all_async(ps);
2612                 wake_up_all(&ps->wait);
2613                 list_del_init(&ps->list);
2614                 if (ps->discsignr) {
2615                         memset(&sinfo, 0, sizeof(sinfo));
2616                         sinfo.si_signo = ps->discsignr;
2617                         sinfo.si_errno = EPIPE;
2618                         sinfo.si_code = SI_ASYNCIO;
2619                         sinfo.si_addr = ps->disccontext;
2620                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2621                                         ps->disc_pid, ps->cred, ps->secid);
2622                 }
2623         }
2624 }
2625
2626 static int usbdev_notify(struct notifier_block *self,
2627                                unsigned long action, void *dev)
2628 {
2629         switch (action) {
2630         case USB_DEVICE_ADD:
2631                 break;
2632         case USB_DEVICE_REMOVE:
2633                 usbdev_remove(dev);
2634                 break;
2635         }
2636         return NOTIFY_OK;
2637 }
2638
2639 static struct notifier_block usbdev_nb = {
2640         .notifier_call =        usbdev_notify,
2641 };
2642
2643 static struct cdev usb_device_cdev;
2644
2645 int __init usb_devio_init(void)
2646 {
2647         int retval;
2648
2649         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2650                                         "usb_device");
2651         if (retval) {
2652                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2653                 goto out;
2654         }
2655         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2656         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2657         if (retval) {
2658                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2659                        USB_DEVICE_MAJOR);
2660                 goto error_cdev;
2661         }
2662         usb_register_notify(&usbdev_nb);
2663 out:
2664         return retval;
2665
2666 error_cdev:
2667         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2668         goto out;
2669 }
2670
2671 void usb_devio_cleanup(void)
2672 {
2673         usb_unregister_notify(&usbdev_nb);
2674         cdev_del(&usb_device_cdev);
2675         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2676 }