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/slab.h>
  40 #include <linux/smp_lock.h>
  41 #include <linux/signal.h>
  42 #include <linux/poll.h>
  43 #include <linux/module.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  46 #include <linux/cdev.h>
  47 #include <linux/notifier.h>
  48 #include <linux/security.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/byteorder.h>
  51 #include <linux/moduleparam.h>
  52
  53 #include "hcd.h"        /* for usbcore internals */
  54 #include "usb.h"
  55 #include "hub.h"
  56
  57 #define USB_MAXBUS                      64
  58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  59
  60 /* Mutual exclusion for removal, open, and release */
  61 DEFINE_MUTEX(usbfs_mutex);
  62
  63 struct dev_state {
  64         struct list_head list;      /* state list */
  65         struct usb_device *dev;
  66         struct file *file;
  67         spinlock_t lock;            /* protects the async urb lists */
  68         struct list_head async_pending;
  69         struct list_head async_completed;
  70         wait_queue_head_t wait;     /* wake up if a request completed */
  71         unsigned int discsignr;
  72         struct pid *disc_pid;
  73         uid_t disc_uid, disc_euid;
  74         void __user *disccontext;
  75         unsigned long ifclaimed;
  76         u32 secid;
  77         u32 disabled_bulk_eps;
  78 };
  79
  80 struct async {
  81         struct list_head asynclist;
  82         struct dev_state *ps;
  83         struct pid *pid;
  84         uid_t uid, euid;
  85         unsigned int signr;
  86         unsigned int ifnum;
  87         void __user *userbuffer;
  88         void __user *userurb;
  89         struct urb *urb;
  90         int status;
  91         u32 secid;
  92         u8 bulk_addr;
  93         u8 bulk_status;
  94 };
  95
  96 static int usbfs_snoop;
  97 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  98 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  99
 100 #define snoop(dev, format, arg...)                              \
 101         do {                                                    \
 102                 if (usbfs_snoop)                                \
 103                         dev_info(dev , format , ## arg);        \
 104         } while (0)
 105
 106 enum snoop_when {
 107         SUBMIT, COMPLETE
 108 };
 109
 110 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 111
 112 #define MAX_USBFS_BUFFER_SIZE   16384
 113
 114
 115 static int connected(struct dev_state *ps)
 116 {
 117         return (!list_empty(&ps->list) &&
 118                         ps->dev->state != USB_STATE_NOTATTACHED);
 119 }
 120
 121 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 122 {
 123         loff_t ret;
 124
 125         lock_kernel();
 126
 127         switch (orig) {
 128         case 0:
 129                 file->f_pos = offset;
 130                 ret = file->f_pos;
 131                 break;
 132         case 1:
 133                 file->f_pos += offset;
 134                 ret = file->f_pos;
 135                 break;
 136         case 2:
 137         default:
 138                 ret = -EINVAL;
 139         }
 140
 141         unlock_kernel();
 142         return ret;
 143 }
 144
 145 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 146                            loff_t *ppos)
 147 {
 148         struct dev_state *ps = file->private_data;
 149         struct usb_device *dev = ps->dev;
 150         ssize_t ret = 0;
 151         unsigned len;
 152         loff_t pos;
 153         int i;
 154
 155         pos = *ppos;
 156         usb_lock_device(dev);
 157         if (!connected(ps)) {
 158                 ret = -ENODEV;
 159                 goto err;
 160         } else if (pos < 0) {
 161                 ret = -EINVAL;
 162                 goto err;
 163         }
 164
 165         if (pos < sizeof(struct usb_device_descriptor)) {
 166                 /* 18 bytes - fits on the stack */
 167                 struct usb_device_descriptor temp_desc;
 168
 169                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 170                 le16_to_cpus(&temp_desc.bcdUSB);
 171                 le16_to_cpus(&temp_desc.idVendor);
 172                 le16_to_cpus(&temp_desc.idProduct);
 173                 le16_to_cpus(&temp_desc.bcdDevice);
 174
 175                 len = sizeof(struct usb_device_descriptor) - pos;
 176                 if (len > nbytes)
 177                         len = nbytes;
 178                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 179                         ret = -EFAULT;
 180                         goto err;
 181                 }
 182
 183                 *ppos += len;
 184                 buf += len;
 185                 nbytes -= len;
 186                 ret += len;
 187         }
 188
 189         pos = sizeof(struct usb_device_descriptor);
 190         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 191                 struct usb_config_descriptor *config =
 192                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 193                 unsigned int length = le16_to_cpu(config->wTotalLength);
 194
 195                 if (*ppos < pos + length) {
 196
 197                         /* The descriptor may claim to be longer than it
 198                          * really is.  Here is the actual allocated length. */
 199                         unsigned alloclen =
 200                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 201
 202                         len = length - (*ppos - pos);
 203                         if (len > nbytes)
 204                                 len = nbytes;
 205
 206                         /* Simply don't write (skip over) unallocated parts */
 207                         if (alloclen > (*ppos - pos)) {
 208                                 alloclen -= (*ppos - pos);
 209                                 if (copy_to_user(buf,
 210                                     dev->rawdescriptors[i] + (*ppos - pos),
 211                                     min(len, alloclen))) {
 212                                         ret = -EFAULT;
 213                                         goto err;
 214                                 }
 215                         }
 216
 217                         *ppos += len;
 218                         buf += len;
 219                         nbytes -= len;
 220                         ret += len;
 221                 }
 222
 223                 pos += length;
 224         }
 225
 226 err:
 227         usb_unlock_device(dev);
 228         return ret;
 229 }
 230
 231 /*
 232  * async list handling
 233  */
 234
 235 static struct async *alloc_async(unsigned int numisoframes)
 236 {
 237         struct async *as;
 238
 239         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 240         if (!as)
 241                 return NULL;
 242         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 243         if (!as->urb) {
 244                 kfree(as);
 245                 return NULL;
 246         }
 247         return as;
 248 }
 249
 250 static void free_async(struct async *as)
 251 {
 252         put_pid(as->pid);
 253         kfree(as->urb->transfer_buffer);
 254         kfree(as->urb->setup_packet);
 255         usb_free_urb(as->urb);
 256         kfree(as);
 257 }
 258
 259 static void async_newpending(struct async *as)
 260 {
 261         struct dev_state *ps = as->ps;
 262         unsigned long flags;
 263
 264         spin_lock_irqsave(&ps->lock, flags);
 265         list_add_tail(&as->asynclist, &ps->async_pending);
 266         spin_unlock_irqrestore(&ps->lock, flags);
 267 }
 268
 269 static void async_removepending(struct async *as)
 270 {
 271         struct dev_state *ps = as->ps;
 272         unsigned long flags;
 273
 274         spin_lock_irqsave(&ps->lock, flags);
 275         list_del_init(&as->asynclist);
 276         spin_unlock_irqrestore(&ps->lock, flags);
 277 }
 278
 279 static struct async *async_getcompleted(struct dev_state *ps)
 280 {
 281         unsigned long flags;
 282         struct async *as = NULL;
 283
 284         spin_lock_irqsave(&ps->lock, flags);
 285         if (!list_empty(&ps->async_completed)) {
 286                 as = list_entry(ps->async_completed.next, struct async,
 287                                 asynclist);
 288                 list_del_init(&as->asynclist);
 289         }
 290         spin_unlock_irqrestore(&ps->lock, flags);
 291         return as;
 292 }
 293
 294 static struct async *async_getpending(struct dev_state *ps,
 295                                              void __user *userurb)
 296 {
 297         unsigned long flags;
 298         struct async *as;
 299
 300         spin_lock_irqsave(&ps->lock, flags);
 301         list_for_each_entry(as, &ps->async_pending, asynclist)
 302                 if (as->userurb == userurb) {
 303                         list_del_init(&as->asynclist);
 304                         spin_unlock_irqrestore(&ps->lock, flags);
 305                         return as;
 306                 }
 307         spin_unlock_irqrestore(&ps->lock, flags);
 308         return NULL;
 309 }
 310
 311 static void snoop_urb(struct usb_device *udev,
 312                 void __user *userurb, int pipe, unsigned length,
 313                 int timeout_or_status, enum snoop_when when)
 314 {
 315         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 316         static const char *dirs[] = {"out", "in"};
 317         int ep;
 318         const char *t, *d;
 319
 320         if (!usbfs_snoop)
 321                 return;
 322
 323         ep = usb_pipeendpoint(pipe);
 324         t = types[usb_pipetype(pipe)];
 325         d = dirs[!!usb_pipein(pipe)];
 326
 327         if (userurb) {          /* Async */
 328                 if (when == SUBMIT)
 329                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 330                                         "length %u\n",
 331                                         userurb, ep, t, d, length);
 332                 else
 333                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 334                                         "actual_length %u status %d\n",
 335                                         userurb, ep, t, d, length,
 336                                         timeout_or_status);
 337         } else {
 338                 if (when == SUBMIT)
 339                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 340                                         "timeout %d\n",
 341                                         ep, t, d, length, timeout_or_status);
 342                 else
 343                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 344                                         "status %d\n",
 345                                         ep, t, d, length, timeout_or_status);
 346         }
 347 }
 348
 349 #define AS_CONTINUATION 1
 350 #define AS_UNLINK       2
 351
 352 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
 353 __releases(ps->lock)
 354 __acquires(ps->lock)
 355 {
 356         struct async *as;
 357
 358         /* Mark all the pending URBs that match bulk_addr, up to but not
 359          * including the first one without AS_CONTINUATION.  If such an
 360          * URB is encountered then a new transfer has already started so
 361          * the endpoint doesn't need to be disabled; otherwise it does.
 362          */
 363         list_for_each_entry(as, &ps->async_pending, asynclist) {
 364                 if (as->bulk_addr == bulk_addr) {
 365                         if (as->bulk_status != AS_CONTINUATION)
 366                                 goto rescan;
 367                         as->bulk_status = AS_UNLINK;
 368                         as->bulk_addr = 0;
 369                 }
 370         }
 371         ps->disabled_bulk_eps |= (1 << bulk_addr);
 372
 373         /* Now carefully unlink all the marked pending URBs */
 374  rescan:
 375         list_for_each_entry(as, &ps->async_pending, asynclist) {
 376                 if (as->bulk_status == AS_UNLINK) {
 377                         as->bulk_status = 0;            /* Only once */
 378                         spin_unlock(&ps->lock);         /* Allow completions */
 379                         usb_unlink_urb(as->urb);
 380                         spin_lock(&ps->lock);
 381                         goto rescan;
 382                 }
 383         }
 384 }
 385
 386 static void async_completed(struct urb *urb)
 387 {
 388         struct async *as = urb->context;
 389         struct dev_state *ps = as->ps;
 390         struct siginfo sinfo;
 391         struct pid *pid = NULL;
 392         uid_t uid = 0;
 393         uid_t euid = 0;
 394         u32 secid = 0;
 395         int signr;
 396
 397         spin_lock(&ps->lock);
 398         list_move_tail(&as->asynclist, &ps->async_completed);
 399         as->status = urb->status;
 400         signr = as->signr;
 401         if (signr) {
 402                 sinfo.si_signo = as->signr;
 403                 sinfo.si_errno = as->status;
 404                 sinfo.si_code = SI_ASYNCIO;
 405                 sinfo.si_addr = as->userurb;
 406                 pid = as->pid;
 407                 uid = as->uid;
 408                 euid = as->euid;
 409                 secid = as->secid;
 410         }
 411         snoop(&urb->dev->dev, "urb complete\n");
 412         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 413                         as->status, COMPLETE);
 414         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 415                         as->status != -ENOENT)
 416                 cancel_bulk_urbs(ps, as->bulk_addr);
 417         spin_unlock(&ps->lock);
 418
 419         if (signr)
 420                 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
 421                                       euid, secid);
 422
 423         wake_up(&ps->wait);
 424 }
 425
 426 static void destroy_async(struct dev_state *ps, struct list_head *list)
 427 {
 428         struct async *as;
 429         unsigned long flags;
 430
 431         spin_lock_irqsave(&ps->lock, flags);
 432         while (!list_empty(list)) {
 433                 as = list_entry(list->next, struct async, asynclist);
 434                 list_del_init(&as->asynclist);
 435
 436                 /* drop the spinlock so the completion handler can run */
 437                 spin_unlock_irqrestore(&ps->lock, flags);
 438                 usb_kill_urb(as->urb);
 439                 spin_lock_irqsave(&ps->lock, flags);
 440         }
 441         spin_unlock_irqrestore(&ps->lock, flags);
 442 }
 443
 444 static void destroy_async_on_interface(struct dev_state *ps,
 445                                        unsigned int ifnum)
 446 {
 447         struct list_head *p, *q, hitlist;
 448         unsigned long flags;
 449
 450         INIT_LIST_HEAD(&hitlist);
 451         spin_lock_irqsave(&ps->lock, flags);
 452         list_for_each_safe(p, q, &ps->async_pending)
 453                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 454                         list_move_tail(p, &hitlist);
 455         spin_unlock_irqrestore(&ps->lock, flags);
 456         destroy_async(ps, &hitlist);
 457 }
 458
 459 static void destroy_all_async(struct dev_state *ps)
 460 {
 461         destroy_async(ps, &ps->async_pending);
 462 }
 463
 464 /*
 465  * interface claims are made only at the request of user level code,
 466  * which can also release them (explicitly or by closing files).
 467  * they're also undone when devices disconnect.
 468  */
 469
 470 static int driver_probe(struct usb_interface *intf,
 471                         const struct usb_device_id *id)
 472 {
 473         return -ENODEV;
 474 }
 475
 476 static void driver_disconnect(struct usb_interface *intf)
 477 {
 478         struct dev_state *ps = usb_get_intfdata(intf);
 479         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 480
 481         if (!ps)
 482                 return;
 483
 484         /* NOTE:  this relies on usbcore having canceled and completed
 485          * all pending I/O requests; 2.6 does that.
 486          */
 487
 488         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 489                 clear_bit(ifnum, &ps->ifclaimed);
 490         else
 491                 dev_warn(&intf->dev, "interface number %u out of range\n",
 492                          ifnum);
 493
 494         usb_set_intfdata(intf, NULL);
 495
 496         /* force async requests to complete */
 497         destroy_async_on_interface(ps, ifnum);
 498 }
 499
 500 /* The following routines are merely placeholders.  There is no way
 501  * to inform a user task about suspend or resumes.
 502  */
 503 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 504 {
 505         return 0;
 506 }
 507
 508 static int driver_resume(struct usb_interface *intf)
 509 {
 510         return 0;
 511 }
 512
 513 struct usb_driver usbfs_driver = {
 514         .name =         "usbfs",
 515         .probe =        driver_probe,
 516         .disconnect =   driver_disconnect,
 517         .suspend =      driver_suspend,
 518         .resume =       driver_resume,
 519 };
 520
 521 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 522 {
 523         struct usb_device *dev = ps->dev;
 524         struct usb_interface *intf;
 525         int err;
 526
 527         if (ifnum >= 8*sizeof(ps->ifclaimed))
 528                 return -EINVAL;
 529         /* already claimed */
 530         if (test_bit(ifnum, &ps->ifclaimed))
 531                 return 0;
 532
 533         intf = usb_ifnum_to_if(dev, ifnum);
 534         if (!intf)
 535                 err = -ENOENT;
 536         else
 537                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 538         if (err == 0)
 539                 set_bit(ifnum, &ps->ifclaimed);
 540         return err;
 541 }
 542
 543 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 544 {
 545         struct usb_device *dev;
 546         struct usb_interface *intf;
 547         int err;
 548
 549         err = -EINVAL;
 550         if (ifnum >= 8*sizeof(ps->ifclaimed))
 551                 return err;
 552         dev = ps->dev;
 553         intf = usb_ifnum_to_if(dev, ifnum);
 554         if (!intf)
 555                 err = -ENOENT;
 556         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 557                 usb_driver_release_interface(&usbfs_driver, intf);
 558                 err = 0;
 559         }
 560         return err;
 561 }
 562
 563 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 564 {
 565         if (ps->dev->state != USB_STATE_CONFIGURED)
 566                 return -EHOSTUNREACH;
 567         if (ifnum >= 8*sizeof(ps->ifclaimed))
 568                 return -EINVAL;
 569         if (test_bit(ifnum, &ps->ifclaimed))
 570                 return 0;
 571         /* if not yet claimed, claim it for the driver */
 572         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 573                  "interface %u before use\n", task_pid_nr(current),
 574                  current->comm, ifnum);
 575         return claimintf(ps, ifnum);
 576 }
 577
 578 static int findintfep(struct usb_device *dev, unsigned int ep)
 579 {
 580         unsigned int i, j, e;
 581         struct usb_interface *intf;
 582         struct usb_host_interface *alts;
 583         struct usb_endpoint_descriptor *endpt;
 584
 585         if (ep & ~(USB_DIR_IN|0xf))
 586                 return -EINVAL;
 587         if (!dev->actconfig)
 588                 return -ESRCH;
 589         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 590                 intf = dev->actconfig->interface[i];
 591                 for (j = 0; j < intf->num_altsetting; j++) {
 592                         alts = &intf->altsetting[j];
 593                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 594                                 endpt = &alts->endpoint[e].desc;
 595                                 if (endpt->bEndpointAddress == ep)
 596                                         return alts->desc.bInterfaceNumber;
 597                         }
 598                 }
 599         }
 600         return -ENOENT;
 601 }
 602
 603 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 604                            unsigned int index)
 605 {
 606         int ret = 0;
 607
 608         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 609          && ps->dev->state != USB_STATE_ADDRESS
 610          && ps->dev->state != USB_STATE_CONFIGURED)
 611                 return -EHOSTUNREACH;
 612         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 613                 return 0;
 614
 615         index &= 0xff;
 616         switch (requesttype & USB_RECIP_MASK) {
 617         case USB_RECIP_ENDPOINT:
 618                 ret = findintfep(ps->dev, index);
 619                 if (ret >= 0)
 620                         ret = checkintf(ps, ret);
 621                 break;
 622
 623         case USB_RECIP_INTERFACE:
 624                 ret = checkintf(ps, index);
 625                 break;
 626         }
 627         return ret;
 628 }
 629
 630 static int match_devt(struct device *dev, void *data)
 631 {
 632         return dev->devt == (dev_t) (unsigned long) data;
 633 }
 634
 635 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 636 {
 637         struct device *dev;
 638
 639         dev = bus_find_device(&usb_bus_type, NULL,
 640                               (void *) (unsigned long) devt, match_devt);
 641         if (!dev)
 642                 return NULL;
 643         return container_of(dev, struct usb_device, dev);
 644 }
 645
 646 /*
 647  * file operations
 648  */
 649 static int usbdev_open(struct inode *inode, struct file *file)
 650 {
 651         struct usb_device *dev = NULL;
 652         struct dev_state *ps;
 653         const struct cred *cred = current_cred();
 654         int ret;
 655
 656         lock_kernel();
 657
 658         ret = -ENOMEM;
 659         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 660         if (!ps)
 661                 goto out_free_ps;
 662
 663         ret = -ENODEV;
 664
 665         /* Protect against simultaneous removal or release */
 666         mutex_lock(&usbfs_mutex);
 667
 668         /* usbdev device-node */
 669         if (imajor(inode) == USB_DEVICE_MAJOR)
 670                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 671
 672 #ifdef CONFIG_USB_DEVICEFS
 673         /* procfs file */
 674         if (!dev) {
 675                 dev = inode->i_private;
 676                 if (dev && dev->usbfs_dentry &&
 677                                         dev->usbfs_dentry->d_inode == inode)
 678                         usb_get_dev(dev);
 679                 else
 680                         dev = NULL;
 681         }
 682 #endif
 683         mutex_unlock(&usbfs_mutex);
 684
 685         if (!dev)
 686                 goto out_free_ps;
 687
 688         usb_lock_device(dev);
 689         if (dev->state == USB_STATE_NOTATTACHED)
 690                 goto out_unlock_device;
 691
 692         ret = usb_autoresume_device(dev);
 693         if (ret)
 694                 goto out_unlock_device;
 695
 696         ps->dev = dev;
 697         ps->file = file;
 698         spin_lock_init(&ps->lock);
 699         INIT_LIST_HEAD(&ps->list);
 700         INIT_LIST_HEAD(&ps->async_pending);
 701         INIT_LIST_HEAD(&ps->async_completed);
 702         init_waitqueue_head(&ps->wait);
 703         ps->discsignr = 0;
 704         ps->disc_pid = get_pid(task_pid(current));
 705         ps->disc_uid = cred->uid;
 706         ps->disc_euid = cred->euid;
 707         ps->disccontext = NULL;
 708         ps->ifclaimed = 0;
 709         security_task_getsecid(current, &ps->secid);
 710         smp_wmb();
 711         list_add_tail(&ps->list, &dev->filelist);
 712         file->private_data = ps;
 713         usb_unlock_device(dev);
 714         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 715                         current->comm);
 716         unlock_kernel();
 717         return ret;
 718
 719  out_unlock_device:
 720         usb_unlock_device(dev);
 721         usb_put_dev(dev);
 722  out_free_ps:
 723         kfree(ps);
 724         unlock_kernel();
 725         return ret;
 726 }
 727
 728 static int usbdev_release(struct inode *inode, struct file *file)
 729 {
 730         struct dev_state *ps = file->private_data;
 731         struct usb_device *dev = ps->dev;
 732         unsigned int ifnum;
 733         struct async *as;
 734
 735         usb_lock_device(dev);
 736         usb_hub_release_all_ports(dev, ps);
 737
 738         list_del_init(&ps->list);
 739
 740         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 741                         ifnum++) {
 742                 if (test_bit(ifnum, &ps->ifclaimed))
 743                         releaseintf(ps, ifnum);
 744         }
 745         destroy_all_async(ps);
 746         usb_autosuspend_device(dev);
 747         usb_unlock_device(dev);
 748         usb_put_dev(dev);
 749         put_pid(ps->disc_pid);
 750
 751         as = async_getcompleted(ps);
 752         while (as) {
 753                 free_async(as);
 754                 as = async_getcompleted(ps);
 755         }
 756         kfree(ps);
 757         return 0;
 758 }
 759
 760 static int proc_control(struct dev_state *ps, void __user *arg)
 761 {
 762         struct usb_device *dev = ps->dev;
 763         struct usbdevfs_ctrltransfer ctrl;
 764         unsigned int tmo;
 765         unsigned char *tbuf;
 766         unsigned wLength;
 767         int i, pipe, ret;
 768
 769         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 770                 return -EFAULT;
 771         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 772         if (ret)
 773                 return ret;
 774         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 775         if (wLength > PAGE_SIZE)
 776                 return -EINVAL;
 777         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 778         if (!tbuf)
 779                 return -ENOMEM;
 780         tmo = ctrl.timeout;
 781         if (ctrl.bRequestType & 0x80) {
 782                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 783                                                ctrl.wLength)) {
 784                         free_page((unsigned long)tbuf);
 785                         return -EINVAL;
 786                 }
 787                 pipe = usb_rcvctrlpipe(dev, 0);
 788                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
 789
 790                 usb_unlock_device(dev);
 791                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 792                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 793                                     tbuf, ctrl.wLength, tmo);
 794                 usb_lock_device(dev);
 795                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
 796
 797                 if ((i > 0) && ctrl.wLength) {
 798                         if (copy_to_user(ctrl.data, tbuf, i)) {
 799                                 free_page((unsigned long)tbuf);
 800                                 return -EFAULT;
 801                         }
 802                 }
 803         } else {
 804                 if (ctrl.wLength) {
 805                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 806                                 free_page((unsigned long)tbuf);
 807                                 return -EFAULT;
 808                         }
 809                 }
 810                 pipe = usb_sndctrlpipe(dev, 0);
 811                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
 812
 813                 usb_unlock_device(dev);
 814                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 815                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 816                                     tbuf, ctrl.wLength, tmo);
 817                 usb_lock_device(dev);
 818                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
 819         }
 820         free_page((unsigned long)tbuf);
 821         if (i < 0 && i != -EPIPE) {
 822                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 823                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 824                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 825                            ctrl.wLength, i);
 826         }
 827         return i;
 828 }
 829
 830 static int proc_bulk(struct dev_state *ps, void __user *arg)
 831 {
 832         struct usb_device *dev = ps->dev;
 833         struct usbdevfs_bulktransfer bulk;
 834         unsigned int tmo, len1, pipe;
 835         int len2;
 836         unsigned char *tbuf;
 837         int i, ret;
 838
 839         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 840                 return -EFAULT;
 841         ret = findintfep(ps->dev, bulk.ep);
 842         if (ret < 0)
 843                 return ret;
 844         ret = checkintf(ps, ret);
 845         if (ret)
 846                 return ret;
 847         if (bulk.ep & USB_DIR_IN)
 848                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 849         else
 850                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 851         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 852                 return -EINVAL;
 853         len1 = bulk.len;
 854         if (len1 > MAX_USBFS_BUFFER_SIZE)
 855                 return -EINVAL;
 856         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 857                 return -ENOMEM;
 858         tmo = bulk.timeout;
 859         if (bulk.ep & 0x80) {
 860                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 861                         kfree(tbuf);
 862                         return -EINVAL;
 863                 }
 864                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
 865
 866                 usb_unlock_device(dev);
 867                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 868                 usb_lock_device(dev);
 869                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
 870
 871                 if (!i && len2) {
 872                         if (copy_to_user(bulk.data, tbuf, len2)) {
 873                                 kfree(tbuf);
 874                                 return -EFAULT;
 875                         }
 876                 }
 877         } else {
 878                 if (len1) {
 879                         if (copy_from_user(tbuf, bulk.data, len1)) {
 880                                 kfree(tbuf);
 881                                 return -EFAULT;
 882                         }
 883                 }
 884                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
 885
 886                 usb_unlock_device(dev);
 887                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 888                 usb_lock_device(dev);
 889                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
 890         }
 891         kfree(tbuf);
 892         if (i < 0)
 893                 return i;
 894         return len2;
 895 }
 896
 897 static int proc_resetep(struct dev_state *ps, void __user *arg)
 898 {
 899         unsigned int ep;
 900         int ret;
 901
 902         if (get_user(ep, (unsigned int __user *)arg))
 903                 return -EFAULT;
 904         ret = findintfep(ps->dev, ep);
 905         if (ret < 0)
 906                 return ret;
 907         ret = checkintf(ps, ret);
 908         if (ret)
 909                 return ret;
 910         usb_reset_endpoint(ps->dev, ep);
 911         return 0;
 912 }
 913
 914 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 915 {
 916         unsigned int ep;
 917         int pipe;
 918         int ret;
 919
 920         if (get_user(ep, (unsigned int __user *)arg))
 921                 return -EFAULT;
 922         ret = findintfep(ps->dev, ep);
 923         if (ret < 0)
 924                 return ret;
 925         ret = checkintf(ps, ret);
 926         if (ret)
 927                 return ret;
 928         if (ep & USB_DIR_IN)
 929                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 930         else
 931                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 932
 933         return usb_clear_halt(ps->dev, pipe);
 934 }
 935
 936 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 937 {
 938         struct usbdevfs_getdriver gd;
 939         struct usb_interface *intf;
 940         int ret;
 941
 942         if (copy_from_user(&gd, arg, sizeof(gd)))
 943                 return -EFAULT;
 944         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 945         if (!intf || !intf->dev.driver)
 946                 ret = -ENODATA;
 947         else {
 948                 strncpy(gd.driver, intf->dev.driver->name,
 949                                 sizeof(gd.driver));
 950                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 951         }
 952         return ret;
 953 }
 954
 955 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 956 {
 957         struct usbdevfs_connectinfo ci;
 958
 959         ci.devnum = ps->dev->devnum;
 960         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 961         if (copy_to_user(arg, &ci, sizeof(ci)))
 962                 return -EFAULT;
 963         return 0;
 964 }
 965
 966 static int proc_resetdevice(struct dev_state *ps)
 967 {
 968         return usb_reset_device(ps->dev);
 969 }
 970
 971 static int proc_setintf(struct dev_state *ps, void __user *arg)
 972 {
 973         struct usbdevfs_setinterface setintf;
 974         int ret;
 975
 976         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 977                 return -EFAULT;
 978         if ((ret = checkintf(ps, setintf.interface)))
 979                 return ret;
 980         return usb_set_interface(ps->dev, setintf.interface,
 981                         setintf.altsetting);
 982 }
 983
 984 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 985 {
 986         int u;
 987         int status = 0;
 988         struct usb_host_config *actconfig;
 989
 990         if (get_user(u, (int __user *)arg))
 991                 return -EFAULT;
 992
 993         actconfig = ps->dev->actconfig;
 994
 995         /* Don't touch the device if any interfaces are claimed.
 996          * It could interfere with other drivers' operations, and if
 997          * an interface is claimed by usbfs it could easily deadlock.
 998          */
 999         if (actconfig) {
1000                 int i;
1001
1002                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1003                         if (usb_interface_claimed(actconfig->interface[i])) {
1004                                 dev_warn(&ps->dev->dev,
1005                                         "usbfs: interface %d claimed by %s "
1006                                         "while '%s' sets config #%d\n",
1007                                         actconfig->interface[i]
1008                                                 ->cur_altsetting
1009                                                 ->desc.bInterfaceNumber,
1010                                         actconfig->interface[i]
1011                                                 ->dev.driver->name,
1012                                         current->comm, u);
1013                                 status = -EBUSY;
1014                                 break;
1015                         }
1016                 }
1017         }
1018
1019         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1020          * so avoid usb_set_configuration()'s kick to sysfs
1021          */
1022         if (status == 0) {
1023                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1024                         status = usb_reset_configuration(ps->dev);
1025                 else
1026                         status = usb_set_configuration(ps->dev, u);
1027         }
1028
1029         return status;
1030 }
1031
1032 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1033                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1034                         void __user *arg)
1035 {
1036         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1037         struct usb_host_endpoint *ep;
1038         struct async *as;
1039         struct usb_ctrlrequest *dr = NULL;
1040         const struct cred *cred = current_cred();
1041         unsigned int u, totlen, isofrmlen;
1042         int ret, ifnum = -1;
1043         int is_in;
1044
1045         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1046                                 USBDEVFS_URB_SHORT_NOT_OK |
1047                                 USBDEVFS_URB_BULK_CONTINUATION |
1048                                 USBDEVFS_URB_NO_FSBR |
1049                                 USBDEVFS_URB_ZERO_PACKET |
1050                                 USBDEVFS_URB_NO_INTERRUPT))
1051                 return -EINVAL;
1052         if (uurb->buffer_length > 0 && !uurb->buffer)
1053                 return -EINVAL;
1054         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1055             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1056                 ifnum = findintfep(ps->dev, uurb->endpoint);
1057                 if (ifnum < 0)
1058                         return ifnum;
1059                 ret = checkintf(ps, ifnum);
1060                 if (ret)
1061                         return ret;
1062         }
1063         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1064                 is_in = 1;
1065                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1066         } else {
1067                 is_in = 0;
1068                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1069         }
1070         if (!ep)
1071                 return -ENOENT;
1072         switch(uurb->type) {
1073         case USBDEVFS_URB_TYPE_CONTROL:
1074                 if (!usb_endpoint_xfer_control(&ep->desc))
1075                         return -EINVAL;
1076                 /* min 8 byte setup packet,
1077                  * max 8 byte setup plus an arbitrary data stage */
1078                 if (uurb->buffer_length < 8 ||
1079                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1080                         return -EINVAL;
1081                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1082                 if (!dr)
1083                         return -ENOMEM;
1084                 if (copy_from_user(dr, uurb->buffer, 8)) {
1085                         kfree(dr);
1086                         return -EFAULT;
1087                 }
1088                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1089                         kfree(dr);
1090                         return -EINVAL;
1091                 }
1092                 ret = check_ctrlrecip(ps, dr->bRequestType,
1093                                       le16_to_cpup(&dr->wIndex));
1094                 if (ret) {
1095                         kfree(dr);
1096                         return ret;
1097                 }
1098                 uurb->number_of_packets = 0;
1099                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1100                 uurb->buffer += 8;
1101                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1102                         is_in = 1;
1103                         uurb->endpoint |= USB_DIR_IN;
1104                 } else {
1105                         is_in = 0;
1106                         uurb->endpoint &= ~USB_DIR_IN;
1107                 }
1108                 break;
1109
1110         case USBDEVFS_URB_TYPE_BULK:
1111                 switch (usb_endpoint_type(&ep->desc)) {
1112                 case USB_ENDPOINT_XFER_CONTROL:
1113                 case USB_ENDPOINT_XFER_ISOC:
1114                         return -EINVAL;
1115                 case USB_ENDPOINT_XFER_INT:
1116                         /* allow single-shot interrupt transfers */
1117                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1118                         goto interrupt_urb;
1119                 }
1120                 uurb->number_of_packets = 0;
1121                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1122                         return -EINVAL;
1123                 break;
1124
1125         case USBDEVFS_URB_TYPE_INTERRUPT:
1126                 if (!usb_endpoint_xfer_int(&ep->desc))
1127                         return -EINVAL;
1128  interrupt_urb:
1129                 uurb->number_of_packets = 0;
1130                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1131                         return -EINVAL;
1132                 break;
1133
1134         case USBDEVFS_URB_TYPE_ISO:
1135                 /* arbitrary limit */
1136                 if (uurb->number_of_packets < 1 ||
1137                     uurb->number_of_packets > 128)
1138                         return -EINVAL;
1139                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1140                         return -EINVAL;
1141                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1142                                    uurb->number_of_packets;
1143                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1144                         return -ENOMEM;
1145                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1146                         kfree(isopkt);
1147                         return -EFAULT;
1148                 }
1149                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1150                         /* arbitrary limit,
1151                          * sufficient for USB 2.0 high-bandwidth iso */
1152                         if (isopkt[u].length > 8192) {
1153                                 kfree(isopkt);
1154                                 return -EINVAL;
1155                         }
1156                         totlen += isopkt[u].length;
1157                 }
1158                 /* 3072 * 64 microframes */
1159                 if (totlen > 196608) {
1160                         kfree(isopkt);
1161                         return -EINVAL;
1162                 }
1163                 uurb->buffer_length = totlen;
1164                 break;
1165
1166         default:
1167                 return -EINVAL;
1168         }
1169         if (uurb->buffer_length > 0 &&
1170                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1171                                 uurb->buffer, uurb->buffer_length)) {
1172                 kfree(isopkt);
1173                 kfree(dr);
1174                 return -EFAULT;
1175         }
1176         as = alloc_async(uurb->number_of_packets);
1177         if (!as) {
1178                 kfree(isopkt);
1179                 kfree(dr);
1180                 return -ENOMEM;
1181         }
1182         if (uurb->buffer_length > 0) {
1183                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1184                                 GFP_KERNEL);
1185                 if (!as->urb->transfer_buffer) {
1186                         kfree(isopkt);
1187                         kfree(dr);
1188                         free_async(as);
1189                         return -ENOMEM;
1190                 }
1191         }
1192         as->urb->dev = ps->dev;
1193         as->urb->pipe = (uurb->type << 30) |
1194                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1195                         (uurb->endpoint & USB_DIR_IN);
1196
1197         /* This tedious sequence is necessary because the URB_* flags
1198          * are internal to the kernel and subject to change, whereas
1199          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1200          */
1201         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1202         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1203                 u |= URB_ISO_ASAP;
1204         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1205                 u |= URB_SHORT_NOT_OK;
1206         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1207                 u |= URB_NO_FSBR;
1208         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1209                 u |= URB_ZERO_PACKET;
1210         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1211                 u |= URB_NO_INTERRUPT;
1212         as->urb->transfer_flags = u;
1213
1214         as->urb->transfer_buffer_length = uurb->buffer_length;
1215         as->urb->setup_packet = (unsigned char *)dr;
1216         as->urb->start_frame = uurb->start_frame;
1217         as->urb->number_of_packets = uurb->number_of_packets;
1218         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1219                         ps->dev->speed == USB_SPEED_HIGH)
1220                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1221         else
1222                 as->urb->interval = ep->desc.bInterval;
1223         as->urb->context = as;
1224         as->urb->complete = async_completed;
1225         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1226                 as->urb->iso_frame_desc[u].offset = totlen;
1227                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1228                 totlen += isopkt[u].length;
1229         }
1230         kfree(isopkt);
1231         as->ps = ps;
1232         as->userurb = arg;
1233         if (is_in && uurb->buffer_length > 0)
1234                 as->userbuffer = uurb->buffer;
1235         else
1236                 as->userbuffer = NULL;
1237         as->signr = uurb->signr;
1238         as->ifnum = ifnum;
1239         as->pid = get_pid(task_pid(current));
1240         as->uid = cred->uid;
1241         as->euid = cred->euid;
1242         security_task_getsecid(current, &as->secid);
1243         if (!is_in && uurb->buffer_length > 0) {
1244                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1245                                 uurb->buffer_length)) {
1246                         free_async(as);
1247                         return -EFAULT;
1248                 }
1249         }
1250         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1251                         as->urb->transfer_buffer_length, 0, SUBMIT);
1252         async_newpending(as);
1253
1254         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1255                 spin_lock_irq(&ps->lock);
1256
1257                 /* Not exactly the endpoint address; the direction bit is
1258                  * shifted to the 0x10 position so that the value will be
1259                  * between 0 and 31.
1260                  */
1261                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1262                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1263                                 >> 3);
1264
1265                 /* If this bulk URB is the start of a new transfer, re-enable
1266                  * the endpoint.  Otherwise mark it as a continuation URB.
1267                  */
1268                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1269                         as->bulk_status = AS_CONTINUATION;
1270                 else
1271                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1272
1273                 /* Don't accept continuation URBs if the endpoint is
1274                  * disabled because of an earlier error.
1275                  */
1276                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1277                         ret = -EREMOTEIO;
1278                 else
1279                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1280                 spin_unlock_irq(&ps->lock);
1281         } else {
1282                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1283         }
1284
1285         if (ret) {
1286                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1287                            "usbfs: usb_submit_urb returned %d\n", ret);
1288                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1289                                 0, ret, COMPLETE);
1290                 async_removepending(as);
1291                 free_async(as);
1292                 return ret;
1293         }
1294         return 0;
1295 }
1296
1297 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1298 {
1299         struct usbdevfs_urb uurb;
1300
1301         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1302                 return -EFAULT;
1303
1304         return proc_do_submiturb(ps, &uurb,
1305                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1306                         arg);
1307 }
1308
1309 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1310 {
1311         struct async *as;
1312
1313         as = async_getpending(ps, arg);
1314         if (!as)
1315                 return -EINVAL;
1316         usb_kill_urb(as->urb);
1317         return 0;
1318 }
1319
1320 static int processcompl(struct async *as, void __user * __user *arg)
1321 {
1322         struct urb *urb = as->urb;
1323         struct usbdevfs_urb __user *userurb = as->userurb;
1324         void __user *addr = as->userurb;
1325         unsigned int i;
1326
1327         if (as->userbuffer && urb->actual_length)
1328                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1329                                  urb->actual_length))
1330                         goto err_out;
1331         if (put_user(as->status, &userurb->status))
1332                 goto err_out;
1333         if (put_user(urb->actual_length, &userurb->actual_length))
1334                 goto err_out;
1335         if (put_user(urb->error_count, &userurb->error_count))
1336                 goto err_out;
1337
1338         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1339                 for (i = 0; i < urb->number_of_packets; i++) {
1340                         if (put_user(urb->iso_frame_desc[i].actual_length,
1341                                      &userurb->iso_frame_desc[i].actual_length))
1342                                 goto err_out;
1343                         if (put_user(urb->iso_frame_desc[i].status,
1344                                      &userurb->iso_frame_desc[i].status))
1345                                 goto err_out;
1346                 }
1347         }
1348
1349         if (put_user(addr, (void __user * __user *)arg))
1350                 return -EFAULT;
1351         return 0;
1352
1353 err_out:
1354         return -EFAULT;
1355 }
1356
1357 static struct async *reap_as(struct dev_state *ps)
1358 {
1359         DECLARE_WAITQUEUE(wait, current);
1360         struct async *as = NULL;
1361         struct usb_device *dev = ps->dev;
1362
1363         add_wait_queue(&ps->wait, &wait);
1364         for (;;) {
1365                 __set_current_state(TASK_INTERRUPTIBLE);
1366                 as = async_getcompleted(ps);
1367                 if (as)
1368                         break;
1369                 if (signal_pending(current))
1370                         break;
1371                 usb_unlock_device(dev);
1372                 schedule();
1373                 usb_lock_device(dev);
1374         }
1375         remove_wait_queue(&ps->wait, &wait);
1376         set_current_state(TASK_RUNNING);
1377         return as;
1378 }
1379
1380 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1381 {
1382         struct async *as = reap_as(ps);
1383         if (as) {
1384                 int retval = processcompl(as, (void __user * __user *)arg);
1385                 free_async(as);
1386                 return retval;
1387         }
1388         if (signal_pending(current))
1389                 return -EINTR;
1390         return -EIO;
1391 }
1392
1393 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1394 {
1395         int retval;
1396         struct async *as;
1397
1398         as = async_getcompleted(ps);
1399         retval = -EAGAIN;
1400         if (as) {
1401                 retval = processcompl(as, (void __user * __user *)arg);
1402                 free_async(as);
1403         }
1404         return retval;
1405 }
1406
1407 #ifdef CONFIG_COMPAT
1408 static int proc_control_compat(struct dev_state *ps,
1409                                 struct usbdevfs_ctrltransfer32 __user *p32)
1410 {
1411         struct usbdevfs_ctrltransfer __user *p;
1412         __u32 udata;
1413         p = compat_alloc_user_space(sizeof(*p));
1414         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1415             get_user(udata, &p32->data) ||
1416             put_user(compat_ptr(udata), &p->data))
1417                 return -EFAULT;
1418         return proc_control(ps, p);
1419 }
1420
1421 static int proc_bulk_compat(struct dev_state *ps,
1422                         struct usbdevfs_bulktransfer32 __user *p32)
1423 {
1424         struct usbdevfs_bulktransfer __user *p;
1425         compat_uint_t n;
1426         compat_caddr_t addr;
1427
1428         p = compat_alloc_user_space(sizeof(*p));
1429
1430         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1431             get_user(n, &p32->len) || put_user(n, &p->len) ||
1432             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1433             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1434                 return -EFAULT;
1435
1436         return proc_bulk(ps, p);
1437 }
1438 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1439 {
1440         struct usbdevfs_disconnectsignal32 ds;
1441
1442         if (copy_from_user(&ds, arg, sizeof(ds)))
1443                 return -EFAULT;
1444         ps->discsignr = ds.signr;
1445         ps->disccontext = compat_ptr(ds.context);
1446         return 0;
1447 }
1448
1449 static int get_urb32(struct usbdevfs_urb *kurb,
1450                      struct usbdevfs_urb32 __user *uurb)
1451 {
1452         __u32  uptr;
1453         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1454             __get_user(kurb->type, &uurb->type) ||
1455             __get_user(kurb->endpoint, &uurb->endpoint) ||
1456             __get_user(kurb->status, &uurb->status) ||
1457             __get_user(kurb->flags, &uurb->flags) ||
1458             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1459             __get_user(kurb->actual_length, &uurb->actual_length) ||
1460             __get_user(kurb->start_frame, &uurb->start_frame) ||
1461             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1462             __get_user(kurb->error_count, &uurb->error_count) ||
1463             __get_user(kurb->signr, &uurb->signr))
1464                 return -EFAULT;
1465
1466         if (__get_user(uptr, &uurb->buffer))
1467                 return -EFAULT;
1468         kurb->buffer = compat_ptr(uptr);
1469         if (__get_user(uptr, &uurb->usercontext))
1470                 return -EFAULT;
1471         kurb->usercontext = compat_ptr(uptr);
1472
1473         return 0;
1474 }
1475
1476 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1477 {
1478         struct usbdevfs_urb uurb;
1479
1480         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1481                 return -EFAULT;
1482
1483         return proc_do_submiturb(ps, &uurb,
1484                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1485                         arg);
1486 }
1487
1488 static int processcompl_compat(struct async *as, void __user * __user *arg)
1489 {
1490         struct urb *urb = as->urb;
1491         struct usbdevfs_urb32 __user *userurb = as->userurb;
1492         void __user *addr = as->userurb;
1493         unsigned int i;
1494
1495         if (as->userbuffer && urb->actual_length)
1496                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1497                                  urb->actual_length))
1498                         return -EFAULT;
1499         if (put_user(as->status, &userurb->status))
1500                 return -EFAULT;
1501         if (put_user(urb->actual_length, &userurb->actual_length))
1502                 return -EFAULT;
1503         if (put_user(urb->error_count, &userurb->error_count))
1504                 return -EFAULT;
1505
1506         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1507                 for (i = 0; i < urb->number_of_packets; i++) {
1508                         if (put_user(urb->iso_frame_desc[i].actual_length,
1509                                      &userurb->iso_frame_desc[i].actual_length))
1510                                 return -EFAULT;
1511                         if (put_user(urb->iso_frame_desc[i].status,
1512                                      &userurb->iso_frame_desc[i].status))
1513                                 return -EFAULT;
1514                 }
1515         }
1516
1517         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1518                 return -EFAULT;
1519         return 0;
1520 }
1521
1522 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1523 {
1524         struct async *as = reap_as(ps);
1525         if (as) {
1526                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1527                 free_async(as);
1528                 return retval;
1529         }
1530         if (signal_pending(current))
1531                 return -EINTR;
1532         return -EIO;
1533 }
1534
1535 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1536 {
1537         int retval;
1538         struct async *as;
1539
1540         retval = -EAGAIN;
1541         as = async_getcompleted(ps);
1542         if (as) {
1543                 retval = processcompl_compat(as, (void __user * __user *)arg);
1544                 free_async(as);
1545         }
1546         return retval;
1547 }
1548
1549
1550 #endif
1551
1552 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1553 {
1554         struct usbdevfs_disconnectsignal ds;
1555
1556         if (copy_from_user(&ds, arg, sizeof(ds)))
1557                 return -EFAULT;
1558         ps->discsignr = ds.signr;
1559         ps->disccontext = ds.context;
1560         return 0;
1561 }
1562
1563 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1564 {
1565         unsigned int ifnum;
1566
1567         if (get_user(ifnum, (unsigned int __user *)arg))
1568                 return -EFAULT;
1569         return claimintf(ps, ifnum);
1570 }
1571
1572 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1573 {
1574         unsigned int ifnum;
1575         int ret;
1576
1577         if (get_user(ifnum, (unsigned int __user *)arg))
1578                 return -EFAULT;
1579         if ((ret = releaseintf(ps, ifnum)) < 0)
1580                 return ret;
1581         destroy_async_on_interface (ps, ifnum);
1582         return 0;
1583 }
1584
1585 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1586 {
1587         int                     size;
1588         void                    *buf = NULL;
1589         int                     retval = 0;
1590         struct usb_interface    *intf = NULL;
1591         struct usb_driver       *driver = NULL;
1592
1593         /* alloc buffer */
1594         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1595                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1596                         return -ENOMEM;
1597                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1598                         if (copy_from_user(buf, ctl->data, size)) {
1599                                 kfree(buf);
1600                                 return -EFAULT;
1601                         }
1602                 } else {
1603                         memset(buf, 0, size);
1604                 }
1605         }
1606
1607         if (!connected(ps)) {
1608                 kfree(buf);
1609                 return -ENODEV;
1610         }
1611
1612         if (ps->dev->state != USB_STATE_CONFIGURED)
1613                 retval = -EHOSTUNREACH;
1614         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1615                 retval = -EINVAL;
1616         else switch (ctl->ioctl_code) {
1617
1618         /* disconnect kernel driver from interface */
1619         case USBDEVFS_DISCONNECT:
1620                 if (intf->dev.driver) {
1621                         driver = to_usb_driver(intf->dev.driver);
1622                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1623                         usb_driver_release_interface(driver, intf);
1624                 } else
1625                         retval = -ENODATA;
1626                 break;
1627
1628         /* let kernel drivers try to (re)bind to the interface */
1629         case USBDEVFS_CONNECT:
1630                 if (!intf->dev.driver)
1631                         retval = device_attach(&intf->dev);
1632                 else
1633                         retval = -EBUSY;
1634                 break;
1635
1636         /* talk directly to the interface's driver */
1637         default:
1638                 if (intf->dev.driver)
1639                         driver = to_usb_driver(intf->dev.driver);
1640                 if (driver == NULL || driver->ioctl == NULL) {
1641                         retval = -ENOTTY;
1642                 } else {
1643                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1644                         if (retval == -ENOIOCTLCMD)
1645                                 retval = -ENOTTY;
1646                 }
1647         }
1648
1649         /* cleanup and return */
1650         if (retval >= 0
1651                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1652                         && size > 0
1653                         && copy_to_user(ctl->data, buf, size) != 0)
1654                 retval = -EFAULT;
1655
1656         kfree(buf);
1657         return retval;
1658 }
1659
1660 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1661 {
1662         struct usbdevfs_ioctl   ctrl;
1663
1664         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1665                 return -EFAULT;
1666         return proc_ioctl(ps, &ctrl);
1667 }
1668
1669 #ifdef CONFIG_COMPAT
1670 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1671 {
1672         struct usbdevfs_ioctl32 __user *uioc;
1673         struct usbdevfs_ioctl ctrl;
1674         u32 udata;
1675
1676         uioc = compat_ptr((long)arg);
1677         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1678             __get_user(ctrl.ifno, &uioc->ifno) ||
1679             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1680             __get_user(udata, &uioc->data))
1681                 return -EFAULT;
1682         ctrl.data = compat_ptr(udata);
1683
1684         return proc_ioctl(ps, &ctrl);
1685 }
1686 #endif
1687
1688 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1689 {
1690         unsigned portnum;
1691         int rc;
1692
1693         if (get_user(portnum, (unsigned __user *) arg))
1694                 return -EFAULT;
1695         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1696         if (rc == 0)
1697                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1698                         portnum, task_pid_nr(current), current->comm);
1699         return rc;
1700 }
1701
1702 static int proc_release_port(struct dev_state *ps, void __user *arg)
1703 {
1704         unsigned portnum;
1705
1706         if (get_user(portnum, (unsigned __user *) arg))
1707                 return -EFAULT;
1708         return usb_hub_release_port(ps->dev, portnum, ps);
1709 }
1710
1711 /*
1712  * NOTE:  All requests here that have interface numbers as parameters
1713  * are assuming that somehow the configuration has been prevented from
1714  * changing.  But there's no mechanism to ensure that...
1715  */
1716 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1717                                 void __user *p)
1718 {
1719         struct dev_state *ps = file->private_data;
1720         struct inode *inode = file->f_path.dentry->d_inode;
1721         struct usb_device *dev = ps->dev;
1722         int ret = -ENOTTY;
1723
1724         if (!(file->f_mode & FMODE_WRITE))
1725                 return -EPERM;
1726         usb_lock_device(dev);
1727         if (!connected(ps)) {
1728                 usb_unlock_device(dev);
1729                 return -ENODEV;
1730         }
1731
1732         switch (cmd) {
1733         case USBDEVFS_CONTROL:
1734                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1735                 ret = proc_control(ps, p);
1736                 if (ret >= 0)
1737                         inode->i_mtime = CURRENT_TIME;
1738                 break;
1739
1740         case USBDEVFS_BULK:
1741                 snoop(&dev->dev, "%s: BULK\n", __func__);
1742                 ret = proc_bulk(ps, p);
1743                 if (ret >= 0)
1744                         inode->i_mtime = CURRENT_TIME;
1745                 break;
1746
1747         case USBDEVFS_RESETEP:
1748                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1749                 ret = proc_resetep(ps, p);
1750                 if (ret >= 0)
1751                         inode->i_mtime = CURRENT_TIME;
1752                 break;
1753
1754         case USBDEVFS_RESET:
1755                 snoop(&dev->dev, "%s: RESET\n", __func__);
1756                 ret = proc_resetdevice(ps);
1757                 break;
1758
1759         case USBDEVFS_CLEAR_HALT:
1760                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1761                 ret = proc_clearhalt(ps, p);
1762                 if (ret >= 0)
1763                         inode->i_mtime = CURRENT_TIME;
1764                 break;
1765
1766         case USBDEVFS_GETDRIVER:
1767                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1768                 ret = proc_getdriver(ps, p);
1769                 break;
1770
1771         case USBDEVFS_CONNECTINFO:
1772                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1773                 ret = proc_connectinfo(ps, p);
1774                 break;
1775
1776         case USBDEVFS_SETINTERFACE:
1777                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1778                 ret = proc_setintf(ps, p);
1779                 break;
1780
1781         case USBDEVFS_SETCONFIGURATION:
1782                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1783                 ret = proc_setconfig(ps, p);
1784                 break;
1785
1786         case USBDEVFS_SUBMITURB:
1787                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1788                 ret = proc_submiturb(ps, p);
1789                 if (ret >= 0)
1790                         inode->i_mtime = CURRENT_TIME;
1791                 break;
1792
1793 #ifdef CONFIG_COMPAT
1794         case USBDEVFS_CONTROL32:
1795                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1796                 ret = proc_control_compat(ps, p);
1797                 if (ret >= 0)
1798                         inode->i_mtime = CURRENT_TIME;
1799                 break;
1800
1801         case USBDEVFS_BULK32:
1802                 snoop(&dev->dev, "%s: BULK32\n", __func__);
1803                 ret = proc_bulk_compat(ps, p);
1804                 if (ret >= 0)
1805                         inode->i_mtime = CURRENT_TIME;
1806                 break;
1807
1808         case USBDEVFS_DISCSIGNAL32:
1809                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1810                 ret = proc_disconnectsignal_compat(ps, p);
1811                 break;
1812
1813         case USBDEVFS_SUBMITURB32:
1814                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1815                 ret = proc_submiturb_compat(ps, p);
1816                 if (ret >= 0)
1817                         inode->i_mtime = CURRENT_TIME;
1818                 break;
1819
1820         case USBDEVFS_REAPURB32:
1821                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1822                 ret = proc_reapurb_compat(ps, p);
1823                 break;
1824
1825         case USBDEVFS_REAPURBNDELAY32:
1826                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1827                 ret = proc_reapurbnonblock_compat(ps, p);
1828                 break;
1829
1830         case USBDEVFS_IOCTL32:
1831                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1832                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1833                 break;
1834 #endif
1835
1836         case USBDEVFS_DISCARDURB:
1837                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1838                 ret = proc_unlinkurb(ps, p);
1839                 break;
1840
1841         case USBDEVFS_REAPURB:
1842                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1843                 ret = proc_reapurb(ps, p);
1844                 break;
1845
1846         case USBDEVFS_REAPURBNDELAY:
1847                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1848                 ret = proc_reapurbnonblock(ps, p);
1849                 break;
1850
1851         case USBDEVFS_DISCSIGNAL:
1852                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1853                 ret = proc_disconnectsignal(ps, p);
1854                 break;
1855
1856         case USBDEVFS_CLAIMINTERFACE:
1857                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1858                 ret = proc_claiminterface(ps, p);
1859                 break;
1860
1861         case USBDEVFS_RELEASEINTERFACE:
1862                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1863                 ret = proc_releaseinterface(ps, p);
1864                 break;
1865
1866         case USBDEVFS_IOCTL:
1867                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1868                 ret = proc_ioctl_default(ps, p);
1869                 break;
1870
1871         case USBDEVFS_CLAIM_PORT:
1872                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1873                 ret = proc_claim_port(ps, p);
1874                 break;
1875
1876         case USBDEVFS_RELEASE_PORT:
1877                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1878                 ret = proc_release_port(ps, p);
1879                 break;
1880         }
1881         usb_unlock_device(dev);
1882         if (ret >= 0)
1883                 inode->i_atime = CURRENT_TIME;
1884         return ret;
1885 }
1886
1887 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1888                         unsigned long arg)
1889 {
1890         int ret;
1891
1892         lock_kernel();
1893         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1894         unlock_kernel();
1895
1896         return ret;
1897 }
1898
1899 #ifdef CONFIG_COMPAT
1900 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1901                         unsigned long arg)
1902 {
1903         int ret;
1904
1905         lock_kernel();
1906         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1907         unlock_kernel();
1908
1909         return ret;
1910 }
1911 #endif
1912
1913 /* No kernel lock - fine */
1914 static unsigned int usbdev_poll(struct file *file,
1915                                 struct poll_table_struct *wait)
1916 {
1917         struct dev_state *ps = file->private_data;
1918         unsigned int mask = 0;
1919
1920         poll_wait(file, &ps->wait, wait);
1921         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1922                 mask |= POLLOUT | POLLWRNORM;
1923         if (!connected(ps))
1924                 mask |= POLLERR | POLLHUP;
1925         return mask;
1926 }
1927
1928 const struct file_operations usbdev_file_operations = {
1929         .owner =          THIS_MODULE,
1930         .llseek =         usbdev_lseek,
1931         .read =           usbdev_read,
1932         .poll =           usbdev_poll,
1933         .unlocked_ioctl = usbdev_ioctl,
1934 #ifdef CONFIG_COMPAT
1935         .compat_ioctl =   usbdev_compat_ioctl,
1936 #endif
1937         .open =           usbdev_open,
1938         .release =        usbdev_release,
1939 };
1940
1941 static void usbdev_remove(struct usb_device *udev)
1942 {
1943         struct dev_state *ps;
1944         struct siginfo sinfo;
1945
1946         while (!list_empty(&udev->filelist)) {
1947                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1948                 destroy_all_async(ps);
1949                 wake_up_all(&ps->wait);
1950                 list_del_init(&ps->list);
1951                 if (ps->discsignr) {
1952                         sinfo.si_signo = ps->discsignr;
1953                         sinfo.si_errno = EPIPE;
1954                         sinfo.si_code = SI_ASYNCIO;
1955                         sinfo.si_addr = ps->disccontext;
1956                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1957                                         ps->disc_pid, ps->disc_uid,
1958                                         ps->disc_euid, ps->secid);
1959                 }
1960         }
1961 }
1962
1963 #ifdef CONFIG_USB_DEVICE_CLASS
1964 static struct class *usb_classdev_class;
1965
1966 static int usb_classdev_add(struct usb_device *dev)
1967 {
1968         struct device *cldev;
1969
1970         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1971                               NULL, "usbdev%d.%d", dev->bus->busnum,
1972                               dev->devnum);
1973         if (IS_ERR(cldev))
1974                 return PTR_ERR(cldev);
1975         dev->usb_classdev = cldev;
1976         return 0;
1977 }
1978
1979 static void usb_classdev_remove(struct usb_device *dev)
1980 {
1981         if (dev->usb_classdev)
1982                 device_unregister(dev->usb_classdev);
1983 }
1984
1985 #else
1986 #define usb_classdev_add(dev)           0
1987 #define usb_classdev_remove(dev)        do {} while (0)
1988
1989 #endif
1990
1991 static int usbdev_notify(struct notifier_block *self,
1992                                unsigned long action, void *dev)
1993 {
1994         switch (action) {
1995         case USB_DEVICE_ADD:
1996                 if (usb_classdev_add(dev))
1997                         return NOTIFY_BAD;
1998                 break;
1999         case USB_DEVICE_REMOVE:
2000                 usb_classdev_remove(dev);
2001                 usbdev_remove(dev);
2002                 break;
2003         }
2004         return NOTIFY_OK;
2005 }
2006
2007 static struct notifier_block usbdev_nb = {
2008         .notifier_call =        usbdev_notify,
2009 };
2010
2011 static struct cdev usb_device_cdev;
2012
2013 int __init usb_devio_init(void)
2014 {
2015         int retval;
2016
2017         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2018                                         "usb_device");
2019         if (retval) {
2020                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2021                 goto out;
2022         }
2023         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2024         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2025         if (retval) {
2026                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2027                        USB_DEVICE_MAJOR);
2028                 goto error_cdev;
2029         }
2030 #ifdef CONFIG_USB_DEVICE_CLASS
2031         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2032         if (IS_ERR(usb_classdev_class)) {
2033                 printk(KERN_ERR "Unable to register usb_device class\n");
2034                 retval = PTR_ERR(usb_classdev_class);
2035                 cdev_del(&usb_device_cdev);
2036                 usb_classdev_class = NULL;
2037                 goto out;
2038         }
2039         /* devices of this class shadow the major:minor of their parent
2040          * device, so clear ->dev_kobj to prevent adding duplicate entries
2041          * to /sys/dev
2042          */
2043         usb_classdev_class->dev_kobj = NULL;
2044 #endif
2045         usb_register_notify(&usbdev_nb);
2046 out:
2047         return retval;
2048
2049 error_cdev:
2050         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2051         goto out;
2052 }
2053
2054 void usb_devio_cleanup(void)
2055 {
2056         usb_unregister_notify(&usbdev_nb);
2057 #ifdef CONFIG_USB_DEVICE_CLASS
2058         class_destroy(usb_classdev_class);
2059 #endif
2060         cdev_del(&usb_device_cdev);
2061         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2062 }