xref: /openbmc/linux/drivers/usb/core/quirks.c (revision 2359ccdd)
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 	/* Creative SB Audigy 2 NX */
190 	{ USB_DEVICE(0x041e, 0x3020), .driver_info = USB_QUIRK_RESET_RESUME },
191 
192 	/* USB3503 */
193 	{ USB_DEVICE(0x0424, 0x3503), .driver_info = USB_QUIRK_RESET_RESUME },
194 
195 	/* Microsoft Wireless Laser Mouse 6000 Receiver */
196 	{ USB_DEVICE(0x045e, 0x00e1), .driver_info = USB_QUIRK_RESET_RESUME },
197 
198 	/* Microsoft LifeCam-VX700 v2.0 */
199 	{ USB_DEVICE(0x045e, 0x0770), .driver_info = USB_QUIRK_RESET_RESUME },
200 
201 	/* Logitech HD Pro Webcams C920, C920-C, C925e and C930e */
202 	{ USB_DEVICE(0x046d, 0x082d), .driver_info = USB_QUIRK_DELAY_INIT },
203 	{ USB_DEVICE(0x046d, 0x0841), .driver_info = USB_QUIRK_DELAY_INIT },
204 	{ USB_DEVICE(0x046d, 0x0843), .driver_info = USB_QUIRK_DELAY_INIT },
205 	{ USB_DEVICE(0x046d, 0x085b), .driver_info = USB_QUIRK_DELAY_INIT },
206 
207 	/* Logitech ConferenceCam CC3000e */
208 	{ USB_DEVICE(0x046d, 0x0847), .driver_info = USB_QUIRK_DELAY_INIT },
209 	{ USB_DEVICE(0x046d, 0x0848), .driver_info = USB_QUIRK_DELAY_INIT },
210 
211 	/* Logitech PTZ Pro Camera */
212 	{ USB_DEVICE(0x046d, 0x0853), .driver_info = USB_QUIRK_DELAY_INIT },
213 
214 	/* Logitech Quickcam Fusion */
215 	{ USB_DEVICE(0x046d, 0x08c1), .driver_info = USB_QUIRK_RESET_RESUME },
216 
217 	/* Logitech Quickcam Orbit MP */
218 	{ USB_DEVICE(0x046d, 0x08c2), .driver_info = USB_QUIRK_RESET_RESUME },
219 
220 	/* Logitech Quickcam Pro for Notebook */
221 	{ USB_DEVICE(0x046d, 0x08c3), .driver_info = USB_QUIRK_RESET_RESUME },
222 
223 	/* Logitech Quickcam Pro 5000 */
224 	{ USB_DEVICE(0x046d, 0x08c5), .driver_info = USB_QUIRK_RESET_RESUME },
225 
226 	/* Logitech Quickcam OEM Dell Notebook */
227 	{ USB_DEVICE(0x046d, 0x08c6), .driver_info = USB_QUIRK_RESET_RESUME },
228 
229 	/* Logitech Quickcam OEM Cisco VT Camera II */
230 	{ USB_DEVICE(0x046d, 0x08c7), .driver_info = USB_QUIRK_RESET_RESUME },
231 
232 	/* Logitech Harmony 700-series */
233 	{ USB_DEVICE(0x046d, 0xc122), .driver_info = USB_QUIRK_DELAY_INIT },
234 
235 	/* Philips PSC805 audio device */
236 	{ USB_DEVICE(0x0471, 0x0155), .driver_info = USB_QUIRK_RESET_RESUME },
237 
238 	/* Plantronic Audio 655 DSP */
239 	{ USB_DEVICE(0x047f, 0xc008), .driver_info = USB_QUIRK_RESET_RESUME },
240 
241 	/* Plantronic Audio 648 USB */
242 	{ USB_DEVICE(0x047f, 0xc013), .driver_info = USB_QUIRK_RESET_RESUME },
243 
244 	/* Artisman Watchdog Dongle */
245 	{ USB_DEVICE(0x04b4, 0x0526), .driver_info =
246 			USB_QUIRK_CONFIG_INTF_STRINGS },
247 
248 	/* Microchip Joss Optical infrared touchboard device */
249 	{ USB_DEVICE(0x04d8, 0x000c), .driver_info =
250 			USB_QUIRK_CONFIG_INTF_STRINGS },
251 
252 	/* CarrolTouch 4000U */
253 	{ USB_DEVICE(0x04e7, 0x0009), .driver_info = USB_QUIRK_RESET_RESUME },
254 
255 	/* CarrolTouch 4500U */
256 	{ USB_DEVICE(0x04e7, 0x0030), .driver_info = USB_QUIRK_RESET_RESUME },
257 
258 	/* Samsung Android phone modem - ID conflict with SPH-I500 */
259 	{ USB_DEVICE(0x04e8, 0x6601), .driver_info =
260 			USB_QUIRK_CONFIG_INTF_STRINGS },
261 
262 	/* Elan Touchscreen */
263 	{ USB_DEVICE(0x04f3, 0x0089), .driver_info =
264 			USB_QUIRK_DEVICE_QUALIFIER },
265 
266 	{ USB_DEVICE(0x04f3, 0x009b), .driver_info =
267 			USB_QUIRK_DEVICE_QUALIFIER },
268 
269 	{ USB_DEVICE(0x04f3, 0x010c), .driver_info =
270 			USB_QUIRK_DEVICE_QUALIFIER },
271 
272 	{ USB_DEVICE(0x04f3, 0x0125), .driver_info =
273 			USB_QUIRK_DEVICE_QUALIFIER },
274 
275 	{ USB_DEVICE(0x04f3, 0x016f), .driver_info =
276 			USB_QUIRK_DEVICE_QUALIFIER },
277 
278 	{ USB_DEVICE(0x04f3, 0x0381), .driver_info =
279 			USB_QUIRK_NO_LPM },
280 
281 	{ USB_DEVICE(0x04f3, 0x21b8), .driver_info =
282 			USB_QUIRK_DEVICE_QUALIFIER },
283 
284 	/* Roland SC-8820 */
285 	{ USB_DEVICE(0x0582, 0x0007), .driver_info = USB_QUIRK_RESET_RESUME },
286 
287 	/* Edirol SD-20 */
288 	{ USB_DEVICE(0x0582, 0x0027), .driver_info = USB_QUIRK_RESET_RESUME },
289 
290 	/* Alcor Micro Corp. Hub */
291 	{ USB_DEVICE(0x058f, 0x9254), .driver_info = USB_QUIRK_RESET_RESUME },
292 
293 	/* appletouch */
294 	{ USB_DEVICE(0x05ac, 0x021a), .driver_info = USB_QUIRK_RESET_RESUME },
295 
296 	/* Genesys Logic hub, internally used by KY-688 USB 3.1 Type-C Hub */
297 	{ USB_DEVICE(0x05e3, 0x0612), .driver_info = USB_QUIRK_NO_LPM },
298 
299 	/* ELSA MicroLink 56K */
300 	{ USB_DEVICE(0x05cc, 0x2267), .driver_info = USB_QUIRK_RESET_RESUME },
301 
302 	/* Genesys Logic hub, internally used by Moshi USB to Ethernet Adapter */
303 	{ USB_DEVICE(0x05e3, 0x0616), .driver_info = USB_QUIRK_NO_LPM },
304 
305 	/* Avision AV600U */
306 	{ USB_DEVICE(0x0638, 0x0a13), .driver_info =
307 	  USB_QUIRK_STRING_FETCH_255 },
308 
309 	/* Saitek Cyborg Gold Joystick */
310 	{ USB_DEVICE(0x06a3, 0x0006), .driver_info =
311 			USB_QUIRK_CONFIG_INTF_STRINGS },
312 
313 	/* Guillemot Webcam Hercules Dualpix Exchange (2nd ID) */
314 	{ USB_DEVICE(0x06f8, 0x0804), .driver_info = USB_QUIRK_RESET_RESUME },
315 
316 	/* Guillemot Webcam Hercules Dualpix Exchange*/
317 	{ USB_DEVICE(0x06f8, 0x3005), .driver_info = USB_QUIRK_RESET_RESUME },
318 
319 	/* Midiman M-Audio Keystation 88es */
320 	{ USB_DEVICE(0x0763, 0x0192), .driver_info = USB_QUIRK_RESET_RESUME },
321 
322 	/* M-Systems Flash Disk Pioneers */
323 	{ USB_DEVICE(0x08ec, 0x1000), .driver_info = USB_QUIRK_RESET_RESUME },
324 
325 	/* Baum Vario Ultra */
326 	{ USB_DEVICE(0x0904, 0x6101), .driver_info =
327 			USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL },
328 	{ USB_DEVICE(0x0904, 0x6102), .driver_info =
329 			USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL },
330 	{ USB_DEVICE(0x0904, 0x6103), .driver_info =
331 			USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL },
332 
333 	/* Keytouch QWERTY Panel keyboard */
334 	{ USB_DEVICE(0x0926, 0x3333), .driver_info =
335 			USB_QUIRK_CONFIG_INTF_STRINGS },
336 
337 	/* X-Rite/Gretag-Macbeth Eye-One Pro display colorimeter */
338 	{ USB_DEVICE(0x0971, 0x2000), .driver_info = USB_QUIRK_NO_SET_INTF },
339 
340 	/* Broadcom BCM92035DGROM BT dongle */
341 	{ USB_DEVICE(0x0a5c, 0x2021), .driver_info = USB_QUIRK_RESET_RESUME },
342 
343 	/* MAYA44USB sound device */
344 	{ USB_DEVICE(0x0a92, 0x0091), .driver_info = USB_QUIRK_RESET_RESUME },
345 
346 	/* ASUS Base Station(T100) */
347 	{ USB_DEVICE(0x0b05, 0x17e0), .driver_info =
348 			USB_QUIRK_IGNORE_REMOTE_WAKEUP },
349 
350 	/* Action Semiconductor flash disk */
351 	{ USB_DEVICE(0x10d6, 0x2200), .driver_info =
352 			USB_QUIRK_STRING_FETCH_255 },
353 
354 	/* Huawei 4G LTE module */
355 	{ USB_DEVICE(0x12d1, 0x15bb), .driver_info =
356 			USB_QUIRK_DISCONNECT_SUSPEND },
357 	{ USB_DEVICE(0x12d1, 0x15c3), .driver_info =
358 			USB_QUIRK_DISCONNECT_SUSPEND },
359 
360 	/* SKYMEDI USB_DRIVE */
361 	{ USB_DEVICE(0x1516, 0x8628), .driver_info = USB_QUIRK_RESET_RESUME },
362 
363 	/* Razer - Razer Blade Keyboard */
364 	{ USB_DEVICE(0x1532, 0x0116), .driver_info =
365 			USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL },
366 
367 	/* BUILDWIN Photo Frame */
368 	{ USB_DEVICE(0x1908, 0x1315), .driver_info =
369 			USB_QUIRK_HONOR_BNUMINTERFACES },
370 
371 	/* Protocol and OTG Electrical Test Device */
372 	{ USB_DEVICE(0x1a0a, 0x0200), .driver_info =
373 			USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL },
374 
375 	/* Corsair K70 RGB */
376 	{ USB_DEVICE(0x1b1c, 0x1b13), .driver_info = USB_QUIRK_DELAY_INIT },
377 
378 	/* Corsair Strafe RGB */
379 	{ USB_DEVICE(0x1b1c, 0x1b20), .driver_info = USB_QUIRK_DELAY_INIT |
380 	  USB_QUIRK_DELAY_CTRL_MSG },
381 
382 	/* Corsair K70 LUX */
383 	{ USB_DEVICE(0x1b1c, 0x1b36), .driver_info = USB_QUIRK_DELAY_INIT },
384 
385 	/* MIDI keyboard WORLDE MINI */
386 	{ USB_DEVICE(0x1c75, 0x0204), .driver_info =
387 			USB_QUIRK_CONFIG_INTF_STRINGS },
388 
389 	/* Acer C120 LED Projector */
390 	{ USB_DEVICE(0x1de1, 0xc102), .driver_info = USB_QUIRK_NO_LPM },
391 
392 	/* Blackmagic Design Intensity Shuttle */
393 	{ USB_DEVICE(0x1edb, 0xbd3b), .driver_info = USB_QUIRK_NO_LPM },
394 
395 	/* Blackmagic Design UltraStudio SDI */
396 	{ USB_DEVICE(0x1edb, 0xbd4f), .driver_info = USB_QUIRK_NO_LPM },
397 
398 	/* Hauppauge HVR-950q */
399 	{ USB_DEVICE(0x2040, 0x7200), .driver_info =
400 			USB_QUIRK_CONFIG_INTF_STRINGS },
401 
402 	/* INTEL VALUE SSD */
403 	{ USB_DEVICE(0x8086, 0xf1a5), .driver_info = USB_QUIRK_RESET_RESUME },
404 
405 	{ }  /* terminating entry must be last */
406 };
407 
408 static const struct usb_device_id usb_interface_quirk_list[] = {
409 	/* Logitech UVC Cameras */
410 	{ USB_VENDOR_AND_INTERFACE_INFO(0x046d, USB_CLASS_VIDEO, 1, 0),
411 	  .driver_info = USB_QUIRK_RESET_RESUME },
412 
413 	{ }  /* terminating entry must be last */
414 };
415 
416 static const struct usb_device_id usb_amd_resume_quirk_list[] = {
417 	/* Lenovo Mouse with Pixart controller */
418 	{ USB_DEVICE(0x17ef, 0x602e), .driver_info = USB_QUIRK_RESET_RESUME },
419 
420 	/* Pixart Mouse */
421 	{ USB_DEVICE(0x093a, 0x2500), .driver_info = USB_QUIRK_RESET_RESUME },
422 	{ USB_DEVICE(0x093a, 0x2510), .driver_info = USB_QUIRK_RESET_RESUME },
423 	{ USB_DEVICE(0x093a, 0x2521), .driver_info = USB_QUIRK_RESET_RESUME },
424 	{ USB_DEVICE(0x03f0, 0x2b4a), .driver_info = USB_QUIRK_RESET_RESUME },
425 
426 	/* Logitech Optical Mouse M90/M100 */
427 	{ USB_DEVICE(0x046d, 0xc05a), .driver_info = USB_QUIRK_RESET_RESUME },
428 
429 	{ }  /* terminating entry must be last */
430 };
431 
432 static bool usb_match_any_interface(struct usb_device *udev,
433 				    const struct usb_device_id *id)
434 {
435 	unsigned int i;
436 
437 	for (i = 0; i < udev->descriptor.bNumConfigurations; ++i) {
438 		struct usb_host_config *cfg = &udev->config[i];
439 		unsigned int j;
440 
441 		for (j = 0; j < cfg->desc.bNumInterfaces; ++j) {
442 			struct usb_interface_cache *cache;
443 			struct usb_host_interface *intf;
444 
445 			cache = cfg->intf_cache[j];
446 			if (cache->num_altsetting == 0)
447 				continue;
448 
449 			intf = &cache->altsetting[0];
450 			if (usb_match_one_id_intf(udev, intf, id))
451 				return true;
452 		}
453 	}
454 
455 	return false;
456 }
457 
458 static int usb_amd_resume_quirk(struct usb_device *udev)
459 {
460 	struct usb_hcd *hcd;
461 
462 	hcd = bus_to_hcd(udev->bus);
463 	/* The device should be attached directly to root hub */
464 	if (udev->level == 1 && hcd->amd_resume_bug == 1)
465 		return 1;
466 
467 	return 0;
468 }
469 
470 static u32 usb_detect_static_quirks(struct usb_device *udev,
471 				    const struct usb_device_id *id)
472 {
473 	u32 quirks = 0;
474 
475 	for (; id->match_flags; id++) {
476 		if (!usb_match_device(udev, id))
477 			continue;
478 
479 		if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_INFO) &&
480 		    !usb_match_any_interface(udev, id))
481 			continue;
482 
483 		quirks |= (u32)(id->driver_info);
484 	}
485 
486 	return quirks;
487 }
488 
489 static u32 usb_detect_dynamic_quirks(struct usb_device *udev)
490 {
491 	u16 vid = le16_to_cpu(udev->descriptor.idVendor);
492 	u16 pid = le16_to_cpu(udev->descriptor.idProduct);
493 	int i, flags = 0;
494 
495 	mutex_lock(&quirk_mutex);
496 
497 	for (i = 0; i < quirk_count; i++) {
498 		if (vid == quirk_list[i].vid && pid == quirk_list[i].pid) {
499 			flags = quirk_list[i].flags;
500 			break;
501 		}
502 	}
503 
504 	mutex_unlock(&quirk_mutex);
505 
506 	return flags;
507 }
508 
509 /*
510  * Detect any quirks the device has, and do any housekeeping for it if needed.
511  */
512 void usb_detect_quirks(struct usb_device *udev)
513 {
514 	udev->quirks = usb_detect_static_quirks(udev, usb_quirk_list);
515 
516 	/*
517 	 * Pixart-based mice would trigger remote wakeup issue on AMD
518 	 * Yangtze chipset, so set them as RESET_RESUME flag.
519 	 */
520 	if (usb_amd_resume_quirk(udev))
521 		udev->quirks |= usb_detect_static_quirks(udev,
522 				usb_amd_resume_quirk_list);
523 
524 	udev->quirks ^= usb_detect_dynamic_quirks(udev);
525 
526 	if (udev->quirks)
527 		dev_dbg(&udev->dev, "USB quirks for this device: %x\n",
528 			udev->quirks);
529 
530 #ifdef CONFIG_USB_DEFAULT_PERSIST
531 	if (!(udev->quirks & USB_QUIRK_RESET))
532 		udev->persist_enabled = 1;
533 #else
534 	/* Hubs are automatically enabled for USB-PERSIST */
535 	if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
536 		udev->persist_enabled = 1;
537 #endif	/* CONFIG_USB_DEFAULT_PERSIST */
538 }
539 
540 void usb_detect_interface_quirks(struct usb_device *udev)
541 {
542 	u32 quirks;
543 
544 	quirks = usb_detect_static_quirks(udev, usb_interface_quirk_list);
545 	if (quirks == 0)
546 		return;
547 
548 	dev_dbg(&udev->dev, "USB interface quirks for this device: %x\n",
549 		quirks);
550 	udev->quirks |= quirks;
551 }
552 
553 void usb_release_quirk_list(void)
554 {
555 	mutex_lock(&quirk_mutex);
556 	kfree(quirk_list);
557 	quirk_list = NULL;
558 	mutex_unlock(&quirk_mutex);
559 }
560