drivers/usb/core/quirks.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * USB device quirk handling logic and table
   4  *
   5  * Copyright (c) 2007 Oliver Neukum
   6  * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de>
   7  */
   8
   9 #include <linux/moduleparam.h>
  10 #include <linux/usb.h>
  11 #include <linux/usb/quirks.h>
  12 #include <linux/usb/hcd.h>
  13 #include "usb.h"
  14
  15 struct quirk_entry {
  16         u16 vid;
  17         u16 pid;
  18         u32 flags;
  19 };
  20
  21 static DEFINE_MUTEX(quirk_mutex);
  22
  23 static struct quirk_entry *quirk_list;
  24 static unsigned int quirk_count;
  25
  26 static char quirks_param[128];
  27
  28 static int quirks_param_set(const char *val, const struct kernel_param *kp)
  29 {
  30         char *p, *field;
  31         u16 vid, pid;
  32         u32 flags;
  33         size_t i;
  34         int err;
  35
  36         err = param_set_copystring(val, kp);
  37         if (err)
  38                 return err;
  39
  40         mutex_lock(&quirk_mutex);
  41
  42         if (!*val) {
  43                 quirk_count = 0;
  44                 kfree(quirk_list);
  45                 quirk_list = NULL;
  46                 goto unlock;
  47         }
  48
  49         for (quirk_count = 1, i = 0; val[i]; i++)
  50                 if (val[i] == ',')
  51                         quirk_count++;
  52
  53         if (quirk_list) {
  54                 kfree(quirk_list);
  55                 quirk_list = NULL;
  56         }
  57
  58         quirk_list = kcalloc(quirk_count, sizeof(struct quirk_entry),
  59                              GFP_KERNEL);
  60         if (!quirk_list) {
  61                 mutex_unlock(&quirk_mutex);
  62                 return -ENOMEM;
  63         }
  64
  65         for (i = 0, p = (char *)val; p && *p;) {
  66                 /* Each entry consists of VID:PID:flags */
  67                 field = strsep(&p, ":");
  68                 if (!field)
  69                         break;
  70
  71                 if (kstrtou16(field, 16, &vid))
  72                         break;
  73
  74                 field = strsep(&p, ":");
  75                 if (!field)
  76                         break;
  77
  78                 if (kstrtou16(field, 16, &pid))
  79                         break;
  80
  81                 field = strsep(&p, ",");
  82                 if (!field || !*field)
  83                         break;
  84
  85                 /* Collect the flags */
  86                 for (flags = 0; *field; field++) {
  87                         switch (*field) {
  88                         case 'a':
  89                                 flags |= USB_QUIRK_STRING_FETCH_255;
  90                                 break;
  91                         case 'b':
  92                                 flags |= USB_QUIRK_RESET_RESUME;
  93                                 break;
  94                         case 'c':
  95                                 flags |= USB_QUIRK_NO_SET_INTF;
  96                                 break;
  97                         case 'd':
  98                                 flags |= USB_QUIRK_CONFIG_INTF_STRINGS;
  99                                 break;
 100                         case 'e':
 101                                 flags |= USB_QUIRK_RESET;
 102                                 break;
 103                         case 'f':
 104                                 flags |= USB_QUIRK_HONOR_BNUMINTERFACES;
 105                                 break;
 106                         case 'g':
 107                                 flags |= USB_QUIRK_DELAY_INIT;
 108                                 break;
 109                         case 'h':
 110                                 flags |= USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL;
 111                                 break;
 112                         case 'i':
 113                                 flags |= USB_QUIRK_DEVICE_QUALIFIER;
 114                                 break;
 115                         case 'j':
 116                                 flags |= USB_QUIRK_IGNORE_REMOTE_WAKEUP;
 117                                 break;
 118                         case 'k':
 119                                 flags |= USB_QUIRK_NO_LPM;
 120                                 break;
 121                         case 'l':
 122                                 flags |= USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL;
 123                                 break;
 124                         case 'm':
 125                                 flags |= USB_QUIRK_DISCONNECT_SUSPEND;
 126                                 break;
 127                         case 'n':
 128                                 flags |= USB_QUIRK_DELAY_CTRL_MSG;
 129                                 break;
 130                         /* Ignore unrecognized flag characters */
 131                         }
 132                 }
 133
 134                 quirk_list[i++] = (struct quirk_entry)
 135                         { .vid = vid, .pid = pid, .flags = flags };
 136         }
 137
 138         if (i < quirk_count)
 139                 quirk_count = i;
 140
 141 unlock:
 142         mutex_unlock(&quirk_mutex);
 143
 144         return 0;
 145 }
 146
 147 static const struct kernel_param_ops quirks_param_ops = {
 148         .set = quirks_param_set,
 149         .get = param_get_string,
 150 };
 151
 152 static struct kparam_string quirks_param_string = {
 153         .maxlen = sizeof(quirks_param),
 154         .string = quirks_param,
 155 };
 156
 157 module_param_cb(quirks, &quirks_param_ops, &quirks_param_string, 0644);
 158 MODULE_PARM_DESC(quirks, "Add/modify USB quirks by specifying quirks=vendorID:productID:quirks");
 159
 160 /* Lists of quirky USB devices, split in device quirks and interface quirks.
 161  * Device quirks are applied at the very beginning of the enumeration process,
 162  * right after reading the device descriptor. They can thus only match on device
 163  * information.
 164  *
 165  * Interface quirks are applied after reading all the configuration descriptors.
 166  * They can match on both device and interface information.
 167  *
 168  * Note that the DELAY_INIT and HONOR_BNUMINTERFACES quirks do not make sense as
 169  * interface quirks, as they only influence the enumeration process which is run
 170  * before processing the interface quirks.
 171  *
 172  * Please keep the lists ordered by:
 173  *      1) Vendor ID
 174  *      2) Product ID
 175  *      3) Class ID
 176  */
 177 static const struct usb_device_id usb_quirk_list[] = {
 178         /* CBM - Flash disk */
 179         { USB_DEVICE(0x0204, 0x6025), .driver_info = USB_QUIRK_RESET_RESUME },
 180
 181         /* WORLDE easy key (easykey.25) MIDI controller  */
 182         { USB_DEVICE(0x0218, 0x0401), .driver_info =
 183                         USB_QUIRK_CONFIG_INTF_STRINGS },
 184
 185         /* HP 5300/5370C scanner */
 186         { USB_DEVICE(0x03f0, 0x0701), .driver_info =
 187                         USB_QUIRK_STRING_FETCH_255 },
 188
 189         /* HP v222w 16GB Mini USB Drive */
 190         { USB_DEVICE(0x03f0, 0x3f40), .driver_info = USB_QUIRK_DELAY_INIT },
 191
 192         /* Creative SB Audigy 2 NX */
 193         { USB_DEVICE(0x041e, 0x3020), .driver_info = USB_QUIRK_RESET_RESUME },
 194
 195         /* USB3503 */
 196         { USB_DEVICE(0x0424, 0x3503), .driver_info = USB_QUIRK_RESET_RESUME },
 197
 198         /* Microsoft Wireless Laser Mouse 6000 Receiver */
 199         { USB_DEVICE(0x045e, 0x00e1), .driver_info = USB_QUIRK_RESET_RESUME },
 200
 201         /* Microsoft LifeCam-VX700 v2.0 */
 202         { USB_DEVICE(0x045e, 0x0770), .driver_info = USB_QUIRK_RESET_RESUME },
 203
 204         /* Logitech HD Pro Webcams C920, C920-C, C925e and C930e */
 205         { USB_DEVICE(0x046d, 0x082d), .driver_info = USB_QUIRK_DELAY_INIT },
 206         { USB_DEVICE(0x046d, 0x0841), .driver_info = USB_QUIRK_DELAY_INIT },
 207         { USB_DEVICE(0x046d, 0x0843), .driver_info = USB_QUIRK_DELAY_INIT },
 208         { USB_DEVICE(0x046d, 0x085b), .driver_info = USB_QUIRK_DELAY_INIT },
 209
 210         /* Logitech ConferenceCam CC3000e */
 211         { USB_DEVICE(0x046d, 0x0847), .driver_info = USB_QUIRK_DELAY_INIT },
 212         { USB_DEVICE(0x046d, 0x0848), .driver_info = USB_QUIRK_DELAY_INIT },
 213
 214         /* Logitech PTZ Pro Camera */
 215         { USB_DEVICE(0x046d, 0x0853), .driver_info = USB_QUIRK_DELAY_INIT },
 216
 217         /* Logitech Quickcam Fusion */
 218         { USB_DEVICE(0x046d, 0x08c1), .driver_info = USB_QUIRK_RESET_RESUME },
 219
 220         /* Logitech Quickcam Orbit MP */
 221         { USB_DEVICE(0x046d, 0x08c2), .driver_info = USB_QUIRK_RESET_RESUME },
 222
 223         /* Logitech Quickcam Pro for Notebook */
 224         { USB_DEVICE(0x046d, 0x08c3), .driver_info = USB_QUIRK_RESET_RESUME },
 225
 226         /* Logitech Quickcam Pro 5000 */
 227         { USB_DEVICE(0x046d, 0x08c5), .driver_info = USB_QUIRK_RESET_RESUME },
 228
 229         /* Logitech Quickcam OEM Dell Notebook */
 230         { USB_DEVICE(0x046d, 0x08c6), .driver_info = USB_QUIRK_RESET_RESUME },
 231
 232         /* Logitech Quickcam OEM Cisco VT Camera II */
 233         { USB_DEVICE(0x046d, 0x08c7), .driver_info = USB_QUIRK_RESET_RESUME },
 234
 235         /* Logitech Harmony 700-series */
 236         { USB_DEVICE(0x046d, 0xc122), .driver_info = USB_QUIRK_DELAY_INIT },
 237
 238         /* Philips PSC805 audio device */
 239         { USB_DEVICE(0x0471, 0x0155), .driver_info = USB_QUIRK_RESET_RESUME },
 240
 241         /* Plantronic Audio 655 DSP */
 242         { USB_DEVICE(0x047f, 0xc008), .driver_info = USB_QUIRK_RESET_RESUME },
 243
 244         /* Plantronic Audio 648 USB */
 245         { USB_DEVICE(0x047f, 0xc013), .driver_info = USB_QUIRK_RESET_RESUME },
 246
 247         /* Artisman Watchdog Dongle */
 248         { USB_DEVICE(0x04b4, 0x0526), .driver_info =
 249                         USB_QUIRK_CONFIG_INTF_STRINGS },
 250
 251         /* Microchip Joss Optical infrared touchboard device */
 252         { USB_DEVICE(0x04d8, 0x000c), .driver_info =
 253                         USB_QUIRK_CONFIG_INTF_STRINGS },
 254
 255         /* CarrolTouch 4000U */
 256         { USB_DEVICE(0x04e7, 0x0009), .driver_info = USB_QUIRK_RESET_RESUME },
 257
 258         /* CarrolTouch 4500U */
 259         { USB_DEVICE(0x04e7, 0x0030), .driver_info = USB_QUIRK_RESET_RESUME },
 260
 261         /* Samsung Android phone modem - ID conflict with SPH-I500 */
 262         { USB_DEVICE(0x04e8, 0x6601), .driver_info =
 263                         USB_QUIRK_CONFIG_INTF_STRINGS },
 264
 265         /* Elan Touchscreen */
 266         { USB_DEVICE(0x04f3, 0x0089), .driver_info =
 267                         USB_QUIRK_DEVICE_QUALIFIER },
 268
 269         { USB_DEVICE(0x04f3, 0x009b), .driver_info =
 270                         USB_QUIRK_DEVICE_QUALIFIER },
 271
 272         { USB_DEVICE(0x04f3, 0x010c), .driver_info =
 273                         USB_QUIRK_DEVICE_QUALIFIER },
 274
 275         { USB_DEVICE(0x04f3, 0x0125), .driver_info =
 276                         USB_QUIRK_DEVICE_QUALIFIER },
 277
 278         { USB_DEVICE(0x04f3, 0x016f), .driver_info =
 279                         USB_QUIRK_DEVICE_QUALIFIER },
 280
 281         { USB_DEVICE(0x04f3, 0x0381), .driver_info =
 282                         USB_QUIRK_NO_LPM },
 283
 284         { USB_DEVICE(0x04f3, 0x21b8), .driver_info =
 285                         USB_QUIRK_DEVICE_QUALIFIER },
 286
 287         /* Roland SC-8820 */
 288         { USB_DEVICE(0x0582, 0x0007), .driver_info = USB_QUIRK_RESET_RESUME },
 289
 290         /* Edirol SD-20 */
 291         { USB_DEVICE(0x0582, 0x0027), .driver_info = USB_QUIRK_RESET_RESUME },
 292
 293         /* Alcor Micro Corp. Hub */
 294         { USB_DEVICE(0x058f, 0x9254), .driver_info = USB_QUIRK_RESET_RESUME },
 295
 296         /* appletouch */
 297         { USB_DEVICE(0x05ac, 0x021a), .driver_info = USB_QUIRK_RESET_RESUME },
 298
 299         /* Genesys Logic hub, internally used by KY-688 USB 3.1 Type-C Hub */
 300         { USB_DEVICE(0x05e3, 0x0612), .driver_info = USB_QUIRK_NO_LPM },
 301
 302         /* ELSA MicroLink 56K */
 303         { USB_DEVICE(0x05cc, 0x2267), .driver_info = USB_QUIRK_RESET_RESUME },
 304
 305         /* Genesys Logic hub, internally used by Moshi USB to Ethernet Adapter */
 306         { USB_DEVICE(0x05e3, 0x0616), .driver_info = USB_QUIRK_NO_LPM },
 307
 308         /* Avision AV600U */
 309         { USB_DEVICE(0x0638, 0x0a13), .driver_info =
 310           USB_QUIRK_STRING_FETCH_255 },
 311
 312         /* Saitek Cyborg Gold Joystick */
 313         { USB_DEVICE(0x06a3, 0x0006), .driver_info =
 314                         USB_QUIRK_CONFIG_INTF_STRINGS },
 315
 316         /* Guillemot Webcam Hercules Dualpix Exchange (2nd ID) */
 317         { USB_DEVICE(0x06f8, 0x0804), .driver_info = USB_QUIRK_RESET_RESUME },
 318
 319         /* Guillemot Webcam Hercules Dualpix Exchange*/
 320         { USB_DEVICE(0x06f8, 0x3005), .driver_info = USB_QUIRK_RESET_RESUME },
 321
 322         /* Midiman M-Audio Keystation 88es */
 323         { USB_DEVICE(0x0763, 0x0192), .driver_info = USB_QUIRK_RESET_RESUME },
 324
 325         /* M-Systems Flash Disk Pioneers */
 326         { USB_DEVICE(0x08ec, 0x1000), .driver_info = USB_QUIRK_RESET_RESUME },
 327
 328         /* Baum Vario Ultra */
 329         { USB_DEVICE(0x0904, 0x6101), .driver_info =
 330                         USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL },
 331         { USB_DEVICE(0x0904, 0x6102), .driver_info =
 332                         USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL },
 333         { USB_DEVICE(0x0904, 0x6103), .driver_info =
 334                         USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL },
 335
 336         /* Keytouch QWERTY Panel keyboard */
 337         { USB_DEVICE(0x0926, 0x3333), .driver_info =
 338                         USB_QUIRK_CONFIG_INTF_STRINGS },
 339
 340         /* X-Rite/Gretag-Macbeth Eye-One Pro display colorimeter */
 341         { USB_DEVICE(0x0971, 0x2000), .driver_info = USB_QUIRK_NO_SET_INTF },
 342
 343         /* Broadcom BCM92035DGROM BT dongle */
 344         { USB_DEVICE(0x0a5c, 0x2021), .driver_info = USB_QUIRK_RESET_RESUME },
 345
 346         /* MAYA44USB sound device */
 347         { USB_DEVICE(0x0a92, 0x0091), .driver_info = USB_QUIRK_RESET_RESUME },
 348
 349         /* ASUS Base Station(T100) */
 350         { USB_DEVICE(0x0b05, 0x17e0), .driver_info =
 351                         USB_QUIRK_IGNORE_REMOTE_WAKEUP },
 352
 353         /* Action Semiconductor flash disk */
 354         { USB_DEVICE(0x10d6, 0x2200), .driver_info =
 355                         USB_QUIRK_STRING_FETCH_255 },
 356
 357         /* Huawei 4G LTE module */
 358         { USB_DEVICE(0x12d1, 0x15bb), .driver_info =
 359                         USB_QUIRK_DISCONNECT_SUSPEND },
 360         { USB_DEVICE(0x12d1, 0x15c3), .driver_info =
 361                         USB_QUIRK_DISCONNECT_SUSPEND },
 362
 363         /* SKYMEDI USB_DRIVE */
 364         { USB_DEVICE(0x1516, 0x8628), .driver_info = USB_QUIRK_RESET_RESUME },
 365
 366         /* Razer - Razer Blade Keyboard */
 367         { USB_DEVICE(0x1532, 0x0116), .driver_info =
 368                         USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL },
 369
 370         /* BUILDWIN Photo Frame */
 371         { USB_DEVICE(0x1908, 0x1315), .driver_info =
 372                         USB_QUIRK_HONOR_BNUMINTERFACES },
 373
 374         /* Protocol and OTG Electrical Test Device */
 375         { USB_DEVICE(0x1a0a, 0x0200), .driver_info =
 376                         USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL },
 377
 378         /* Corsair K70 RGB */
 379         { USB_DEVICE(0x1b1c, 0x1b13), .driver_info = USB_QUIRK_DELAY_INIT },
 380
 381         /* Corsair Strafe */
 382         { USB_DEVICE(0x1b1c, 0x1b15), .driver_info = USB_QUIRK_DELAY_INIT |
 383           USB_QUIRK_DELAY_CTRL_MSG },
 384
 385         /* Corsair Strafe RGB */
 386         { USB_DEVICE(0x1b1c, 0x1b20), .driver_info = USB_QUIRK_DELAY_INIT |
 387           USB_QUIRK_DELAY_CTRL_MSG },
 388
 389         /* Corsair K70 LUX */
 390         { USB_DEVICE(0x1b1c, 0x1b36), .driver_info = USB_QUIRK_DELAY_INIT },
 391
 392         /* MIDI keyboard WORLDE MINI */
 393         { USB_DEVICE(0x1c75, 0x0204), .driver_info =
 394                         USB_QUIRK_CONFIG_INTF_STRINGS },
 395
 396         /* Acer C120 LED Projector */
 397         { USB_DEVICE(0x1de1, 0xc102), .driver_info = USB_QUIRK_NO_LPM },
 398
 399         /* Blackmagic Design Intensity Shuttle */
 400         { USB_DEVICE(0x1edb, 0xbd3b), .driver_info = USB_QUIRK_NO_LPM },
 401
 402         /* Blackmagic Design UltraStudio SDI */
 403         { USB_DEVICE(0x1edb, 0xbd4f), .driver_info = USB_QUIRK_NO_LPM },
 404
 405         /* Hauppauge HVR-950q */
 406         { USB_DEVICE(0x2040, 0x7200), .driver_info =
 407                         USB_QUIRK_CONFIG_INTF_STRINGS },
 408
 409         /* INTEL VALUE SSD */
 410         { USB_DEVICE(0x8086, 0xf1a5), .driver_info = USB_QUIRK_RESET_RESUME },
 411
 412         { }  /* terminating entry must be last */
 413 };
 414
 415 static const struct usb_device_id usb_interface_quirk_list[] = {
 416         /* Logitech UVC Cameras */
 417         { USB_VENDOR_AND_INTERFACE_INFO(0x046d, USB_CLASS_VIDEO, 1, 0),
 418           .driver_info = USB_QUIRK_RESET_RESUME },
 419
 420         { }  /* terminating entry must be last */
 421 };
 422
 423 static const struct usb_device_id usb_amd_resume_quirk_list[] = {
 424         /* Lenovo Mouse with Pixart controller */
 425         { USB_DEVICE(0x17ef, 0x602e), .driver_info = USB_QUIRK_RESET_RESUME },
 426
 427         /* Pixart Mouse */
 428         { USB_DEVICE(0x093a, 0x2500), .driver_info = USB_QUIRK_RESET_RESUME },
 429         { USB_DEVICE(0x093a, 0x2510), .driver_info = USB_QUIRK_RESET_RESUME },
 430         { USB_DEVICE(0x093a, 0x2521), .driver_info = USB_QUIRK_RESET_RESUME },
 431         { USB_DEVICE(0x03f0, 0x2b4a), .driver_info = USB_QUIRK_RESET_RESUME },
 432
 433         /* Logitech Optical Mouse M90/M100 */
 434         { USB_DEVICE(0x046d, 0xc05a), .driver_info = USB_QUIRK_RESET_RESUME },
 435
 436         { }  /* terminating entry must be last */
 437 };
 438
 439 static bool usb_match_any_interface(struct usb_device *udev,
 440                                     const struct usb_device_id *id)
 441 {
 442         unsigned int i;
 443
 444         for (i = 0; i < udev->descriptor.bNumConfigurations; ++i) {
 445                 struct usb_host_config *cfg = &udev->config[i];
 446                 unsigned int j;
 447
 448                 for (j = 0; j < cfg->desc.bNumInterfaces; ++j) {
 449                         struct usb_interface_cache *cache;
 450                         struct usb_host_interface *intf;
 451
 452                         cache = cfg->intf_cache[j];
 453                         if (cache->num_altsetting == 0)
 454                                 continue;
 455
 456                         intf = &cache->altsetting[0];
 457                         if (usb_match_one_id_intf(udev, intf, id))
 458                                 return true;
 459                 }
 460         }
 461
 462         return false;
 463 }
 464
 465 static int usb_amd_resume_quirk(struct usb_device *udev)
 466 {
 467         struct usb_hcd *hcd;
 468
 469         hcd = bus_to_hcd(udev->bus);
 470         /* The device should be attached directly to root hub */
 471         if (udev->level == 1 && hcd->amd_resume_bug == 1)
 472                 return 1;
 473
 474         return 0;
 475 }
 476
 477 static u32 usb_detect_static_quirks(struct usb_device *udev,
 478                                     const struct usb_device_id *id)
 479 {
 480         u32 quirks = 0;
 481
 482         for (; id->match_flags; id++) {
 483                 if (!usb_match_device(udev, id))
 484                         continue;
 485
 486                 if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_INFO) &&
 487                     !usb_match_any_interface(udev, id))
 488                         continue;
 489
 490                 quirks |= (u32)(id->driver_info);
 491         }
 492
 493         return quirks;
 494 }
 495
 496 static u32 usb_detect_dynamic_quirks(struct usb_device *udev)
 497 {
 498         u16 vid = le16_to_cpu(udev->descriptor.idVendor);
 499         u16 pid = le16_to_cpu(udev->descriptor.idProduct);
 500         int i, flags = 0;
 501
 502         mutex_lock(&quirk_mutex);
 503
 504         for (i = 0; i < quirk_count; i++) {
 505                 if (vid == quirk_list[i].vid && pid == quirk_list[i].pid) {
 506                         flags = quirk_list[i].flags;
 507                         break;
 508                 }
 509         }
 510
 511         mutex_unlock(&quirk_mutex);
 512
 513         return flags;
 514 }
 515
 516 /*
 517  * Detect any quirks the device has, and do any housekeeping for it if needed.
 518  */
 519 void usb_detect_quirks(struct usb_device *udev)
 520 {
 521         udev->quirks = usb_detect_static_quirks(udev, usb_quirk_list);
 522
 523         /*
 524          * Pixart-based mice would trigger remote wakeup issue on AMD
 525          * Yangtze chipset, so set them as RESET_RESUME flag.
 526          */
 527         if (usb_amd_resume_quirk(udev))
 528                 udev->quirks |= usb_detect_static_quirks(udev,
 529                                 usb_amd_resume_quirk_list);
 530
 531         udev->quirks ^= usb_detect_dynamic_quirks(udev);
 532
 533         if (udev->quirks)
 534                 dev_dbg(&udev->dev, "USB quirks for this device: %x\n",
 535                         udev->quirks);
 536
 537 #ifdef CONFIG_USB_DEFAULT_PERSIST
 538         if (!(udev->quirks & USB_QUIRK_RESET))
 539                 udev->persist_enabled = 1;
 540 #else
 541         /* Hubs are automatically enabled for USB-PERSIST */
 542         if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
 543                 udev->persist_enabled = 1;
 544 #endif  /* CONFIG_USB_DEFAULT_PERSIST */
 545 }
 546
 547 void usb_detect_interface_quirks(struct usb_device *udev)
 548 {
 549         u32 quirks;
 550
 551         quirks = usb_detect_static_quirks(udev, usb_interface_quirk_list);
 552         if (quirks == 0)
 553                 return;
 554
 555         dev_dbg(&udev->dev, "USB interface quirks for this device: %x\n",
 556                 quirks);
 557         udev->quirks |= quirks;
 558 }
 559
 560 void usb_release_quirk_list(void)
 561 {
 562         mutex_lock(&quirk_mutex);
 563         kfree(quirk_list);
 564         quirk_list = NULL;
 565         mutex_unlock(&quirk_mutex);
 566 }