summaryrefslogtreecommitdiff
path: root/drivers/base/firmware_loader/fallback.c
blob: b676a99c469c2fcf475db6ff81359a0f363f8d4f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
// SPDX-License-Identifier: GPL-2.0

#include <linux/types.h>
#include <linux/kconfig.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/security.h>
#include <linux/highmem.h>
#include <linux/umh.h>
#include <linux/sysctl.h>
#include <linux/vmalloc.h>

#include "fallback.h"
#include "firmware.h"

/*
 * firmware fallback mechanism
 */

extern struct firmware_fallback_config fw_fallback_config;

/* These getters are vetted to use int properly */
static inline int __firmware_loading_timeout(void)
{
	return fw_fallback_config.loading_timeout;
}

/* These setters are vetted to use int properly */
static void __fw_fallback_set_timeout(int timeout)
{
	fw_fallback_config.loading_timeout = timeout;
}

/*
 * use small loading timeout for caching devices' firmware because all these
 * firmware images have been loaded successfully at lease once, also system is
 * ready for completing firmware loading now. The maximum size of firmware in
 * current distributions is about 2M bytes, so 10 secs should be enough.
 */
void fw_fallback_set_cache_timeout(void)
{
	fw_fallback_config.old_timeout = __firmware_loading_timeout();
	__fw_fallback_set_timeout(10);
}

/* Restores the timeout to the value last configured during normal operation */
void fw_fallback_set_default_timeout(void)
{
	__fw_fallback_set_timeout(fw_fallback_config.old_timeout);
}

static long firmware_loading_timeout(void)
{
	return __firmware_loading_timeout() > 0 ?
		__firmware_loading_timeout() * HZ : MAX_JIFFY_OFFSET;
}

static inline bool fw_sysfs_done(struct fw_priv *fw_priv)
{
	return __fw_state_check(fw_priv, FW_STATUS_DONE);
}

static inline bool fw_sysfs_loading(struct fw_priv *fw_priv)
{
	return __fw_state_check(fw_priv, FW_STATUS_LOADING);
}

static inline int fw_sysfs_wait_timeout(struct fw_priv *fw_priv,  long timeout)
{
	return __fw_state_wait_common(fw_priv, timeout);
}

struct fw_sysfs {
	bool nowait;
	struct device dev;
	struct fw_priv *fw_priv;
	struct firmware *fw;
};

static struct fw_sysfs *to_fw_sysfs(struct device *dev)
{
	return container_of(dev, struct fw_sysfs, dev);
}

static void __fw_load_abort(struct fw_priv *fw_priv)
{
	/*
	 * There is a small window in which user can write to 'loading'
	 * between loading done and disappearance of 'loading'
	 */
	if (fw_sysfs_done(fw_priv))
		return;

	list_del_init(&fw_priv->pending_list);
	fw_state_aborted(fw_priv);
}

static void fw_load_abort(struct fw_sysfs *fw_sysfs)
{
	struct fw_priv *fw_priv = fw_sysfs->fw_priv;

	__fw_load_abort(fw_priv);
}

static LIST_HEAD(pending_fw_head);

void kill_pending_fw_fallback_reqs(bool only_kill_custom)
{
	struct fw_priv *fw_priv;
	struct fw_priv *next;

	mutex_lock(&fw_lock);
	list_for_each_entry_safe(fw_priv, next, &pending_fw_head,
				 pending_list) {
		if (!fw_priv->need_uevent || !only_kill_custom)
			 __fw_load_abort(fw_priv);
	}
	mutex_unlock(&fw_lock);
}

static ssize_t timeout_show(struct class *class, struct class_attribute *attr,
			    char *buf)
{
	return sprintf(buf, "%d\n", __firmware_loading_timeout());
}

/**
 * firmware_timeout_store() - set number of seconds to wait for firmware
 * @class: device class pointer
 * @attr: device attribute pointer
 * @buf: buffer to scan for timeout value
 * @count: number of bytes in @buf
 *
 *	Sets the number of seconds to wait for the firmware.  Once
 *	this expires an error will be returned to the driver and no
 *	firmware will be provided.
 *
 *	Note: zero means 'wait forever'.
 **/
static ssize_t timeout_store(struct class *class, struct class_attribute *attr,
			     const char *buf, size_t count)
{
	int tmp_loading_timeout = simple_strtol(buf, NULL, 10);

	if (tmp_loading_timeout < 0)
		tmp_loading_timeout = 0;

	__fw_fallback_set_timeout(tmp_loading_timeout);

	return count;
}
static CLASS_ATTR_RW(timeout);

static struct attribute *firmware_class_attrs[] = {
	&class_attr_timeout.attr,
	NULL,
};
ATTRIBUTE_GROUPS(firmware_class);

static void fw_dev_release(struct device *dev)
{
	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);

	kfree(fw_sysfs);
}

static int do_firmware_uevent(struct fw_sysfs *fw_sysfs, struct kobj_uevent_env *env)
{
	if (add_uevent_var(env, "FIRMWARE=%s", fw_sysfs->fw_priv->fw_name))
		return -ENOMEM;
	if (add_uevent_var(env, "TIMEOUT=%i", __firmware_loading_timeout()))
		return -ENOMEM;
	if (add_uevent_var(env, "ASYNC=%d", fw_sysfs->nowait))
		return -ENOMEM;

	return 0;
}

static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
	int err = 0;

	mutex_lock(&fw_lock);
	if (fw_sysfs->fw_priv)
		err = do_firmware_uevent(fw_sysfs, env);
	mutex_unlock(&fw_lock);
	return err;
}

static struct class firmware_class = {
	.name		= "firmware",
	.class_groups	= firmware_class_groups,
	.dev_uevent	= firmware_uevent,
	.dev_release	= fw_dev_release,
};

int register_sysfs_loader(void)
{
	return class_register(&firmware_class);
}

void unregister_sysfs_loader(void)
{
	class_unregister(&firmware_class);
}

static ssize_t firmware_loading_show(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
	int loading = 0;

	mutex_lock(&fw_lock);
	if (fw_sysfs->fw_priv)
		loading = fw_sysfs_loading(fw_sysfs->fw_priv);
	mutex_unlock(&fw_lock);

	return sprintf(buf, "%d\n", loading);
}

/* Some architectures don't have PAGE_KERNEL_RO */
#ifndef PAGE_KERNEL_RO
#define PAGE_KERNEL_RO PAGE_KERNEL
#endif

/* one pages buffer should be mapped/unmapped only once */
static int map_fw_priv_pages(struct fw_priv *fw_priv)
{
	if (!fw_priv->is_paged_buf)
		return 0;

	vunmap(fw_priv->data);
	fw_priv->data = vmap(fw_priv->pages, fw_priv->nr_pages, 0,
			     PAGE_KERNEL_RO);
	if (!fw_priv->data)
		return -ENOMEM;
	return 0;
}

/**
 * firmware_loading_store() - set value in the 'loading' control file
 * @dev: device pointer
 * @attr: device attribute pointer
 * @buf: buffer to scan for loading control value
 * @count: number of bytes in @buf
 *
 *	The relevant values are:
 *
 *	 1: Start a load, discarding any previous partial load.
 *	 0: Conclude the load and hand the data to the driver code.
 *	-1: Conclude the load with an error and discard any written data.
 **/
static ssize_t firmware_loading_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t count)
{
	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
	struct fw_priv *fw_priv;
	ssize_t written = count;
	int loading = simple_strtol(buf, NULL, 10);
	int i;

	mutex_lock(&fw_lock);
	fw_priv = fw_sysfs->fw_priv;
	if (fw_state_is_aborted(fw_priv))
		goto out;

	switch (loading) {
	case 1:
		/* discarding any previous partial load */
		if (!fw_sysfs_done(fw_priv)) {
			for (i = 0; i < fw_priv->nr_pages; i++)
				__free_page(fw_priv->pages[i]);
			vfree(fw_priv->pages);
			fw_priv->pages = NULL;
			fw_priv->page_array_size = 0;
			fw_priv->nr_pages = 0;
			fw_state_start(fw_priv);
		}
		break;
	case 0:
		if (fw_sysfs_loading(fw_priv)) {
			int rc;

			/*
			 * Several loading requests may be pending on
			 * one same firmware buf, so let all requests
			 * see the mapped 'buf->data' once the loading
			 * is completed.
			 * */
			rc = map_fw_priv_pages(fw_priv);
			if (rc)
				dev_err(dev, "%s: map pages failed\n",
					__func__);
			else
				rc = security_kernel_post_read_file(NULL,
						fw_priv->data, fw_priv->size,
						READING_FIRMWARE);

			/*
			 * Same logic as fw_load_abort, only the DONE bit
			 * is ignored and we set ABORT only on failure.
			 */
			list_del_init(&fw_priv->pending_list);
			if (rc) {
				fw_state_aborted(fw_priv);
				written = rc;
			} else {
				fw_state_done(fw_priv);
			}
			break;
		}
		/* fallthrough */
	default:
		dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading);
		/* fallthrough */
	case -1:
		fw_load_abort(fw_sysfs);
		break;
	}
out:
	mutex_unlock(&fw_lock);
	return written;
}

static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store);

static void firmware_rw_data(struct fw_priv *fw_priv, char *buffer,
			   loff_t offset, size_t count, bool read)
{
	if (read)
		memcpy(buffer, fw_priv->data + offset, count);
	else
		memcpy(fw_priv->data + offset, buffer, count);
}

static void firmware_rw(struct fw_priv *fw_priv, char *buffer,
			loff_t offset, size_t count, bool read)
{
	while (count) {
		void *page_data;
		int page_nr = offset >> PAGE_SHIFT;
		int page_ofs = offset & (PAGE_SIZE-1);
		int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);

		page_data = kmap(fw_priv->pages[page_nr]);

		if (read)
			memcpy(buffer, page_data + page_ofs, page_cnt);
		else
			memcpy(page_data + page_ofs, buffer, page_cnt);

		kunmap(fw_priv->pages[page_nr]);
		buffer += page_cnt;
		offset += page_cnt;
		count -= page_cnt;
	}
}

static ssize_t firmware_data_read(struct file *filp, struct kobject *kobj,
				  struct bin_attribute *bin_attr,
				  char *buffer, loff_t offset, size_t count)
{
	struct device *dev = kobj_to_dev(kobj);
	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
	struct fw_priv *fw_priv;
	ssize_t ret_count;

	mutex_lock(&fw_lock);
	fw_priv = fw_sysfs->fw_priv;
	if (!fw_priv || fw_sysfs_done(fw_priv)) {
		ret_count = -ENODEV;
		goto out;
	}
	if (offset > fw_priv->size) {
		ret_count = 0;
		goto out;
	}
	if (count > fw_priv->size - offset)
		count = fw_priv->size - offset;

	ret_count = count;

	if (fw_priv->data)
		firmware_rw_data(fw_priv, buffer, offset, count, true);
	else
		firmware_rw(fw_priv, buffer, offset, count, true);

out:
	mutex_unlock(&fw_lock);
	return ret_count;
}

static int fw_realloc_pages(struct fw_sysfs *fw_sysfs, int min_size)
{
	struct fw_priv *fw_priv= fw_sysfs->fw_priv;
	int pages_needed = PAGE_ALIGN(min_size) >> PAGE_SHIFT;

	/* If the array of pages is too small, grow it... */
	if (fw_priv->page_array_size < pages_needed) {
		int new_array_size = max(pages_needed,
					 fw_priv->page_array_size * 2);
		struct page **new_pages;

		new_pages = vmalloc(new_array_size * sizeof(void *));
		if (!new_pages) {
			fw_load_abort(fw_sysfs);
			return -ENOMEM;
		}
		memcpy(new_pages, fw_priv->pages,
		       fw_priv->page_array_size * sizeof(void *));
		memset(&new_pages[fw_priv->page_array_size], 0, sizeof(void *) *
		       (new_array_size - fw_priv->page_array_size));
		vfree(fw_priv->pages);
		fw_priv->pages = new_pages;
		fw_priv->page_array_size = new_array_size;
	}

	while (fw_priv->nr_pages < pages_needed) {
		fw_priv->pages[fw_priv->nr_pages] =
			alloc_page(GFP_KERNEL | __GFP_HIGHMEM);

		if (!fw_priv->pages[fw_priv->nr_pages]) {
			fw_load_abort(fw_sysfs);
			return -ENOMEM;
		}
		fw_priv->nr_pages++;
	}
	return 0;
}

/**
 * firmware_data_write() - write method for firmware
 * @filp: open sysfs file
 * @kobj: kobject for the device
 * @bin_attr: bin_attr structure
 * @buffer: buffer being written
 * @offset: buffer offset for write in total data store area
 * @count: buffer size
 *
 *	Data written to the 'data' attribute will be later handed to
 *	the driver as a firmware image.
 **/
static ssize_t firmware_data_write(struct file *filp, struct kobject *kobj,
				   struct bin_attribute *bin_attr,
				   char *buffer, loff_t offset, size_t count)
{
	struct device *dev = kobj_to_dev(kobj);
	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
	struct fw_priv *fw_priv;
	ssize_t retval;

	if (!capable(CAP_SYS_RAWIO))
		return -EPERM;

	mutex_lock(&fw_lock);
	fw_priv = fw_sysfs->fw_priv;
	if (!fw_priv || fw_sysfs_done(fw_priv)) {
		retval = -ENODEV;
		goto out;
	}

	if (fw_priv->data) {
		if (offset + count > fw_priv->allocated_size) {
			retval = -ENOMEM;
			goto out;
		}
		firmware_rw_data(fw_priv, buffer, offset, count, false);
		retval = count;
	} else {
		retval = fw_realloc_pages(fw_sysfs, offset + count);
		if (retval)
			goto out;

		retval = count;
		firmware_rw(fw_priv, buffer, offset, count, false);
	}

	fw_priv->size = max_t(size_t, offset + count, fw_priv->size);
out:
	mutex_unlock(&fw_lock);
	return retval;
}

static struct bin_attribute firmware_attr_data = {
	.attr = { .name = "data", .mode = 0644 },
	.size = 0,
	.read = firmware_data_read,
	.write = firmware_data_write,
};

static struct attribute *fw_dev_attrs[] = {
	&dev_attr_loading.attr,
	NULL
};

static struct bin_attribute *fw_dev_bin_attrs[] = {
	&firmware_attr_data,
	NULL
};

static const struct attribute_group fw_dev_attr_group = {
	.attrs = fw_dev_attrs,
	.bin_attrs = fw_dev_bin_attrs,
};

static const struct attribute_group *fw_dev_attr_groups[] = {
	&fw_dev_attr_group,
	NULL
};

static struct fw_sysfs *
fw_create_instance(struct firmware *firmware, const char *fw_name,
		   struct device *device, enum fw_opt opt_flags)
{
	struct fw_sysfs *fw_sysfs;
	struct device *f_dev;

	fw_sysfs = kzalloc(sizeof(*fw_sysfs), GFP_KERNEL);
	if (!fw_sysfs) {
		fw_sysfs = ERR_PTR(-ENOMEM);
		goto exit;
	}

	fw_sysfs->nowait = !!(opt_flags & FW_OPT_NOWAIT);
	fw_sysfs->fw = firmware;
	f_dev = &fw_sysfs->dev;

	device_initialize(f_dev);
	dev_set_name(f_dev, "%s", fw_name);
	f_dev->parent = device;
	f_dev->class = &firmware_class;
	f_dev->groups = fw_dev_attr_groups;
exit:
	return fw_sysfs;
}

/**
 * fw_load_sysfs_fallback() - load a firmware via the sysfs fallback mechanism
 * @fw_sysfs: firmware sysfs information for the firmware to load
 * @opt_flags: flags of options, FW_OPT_*
 * @timeout: timeout to wait for the load
 *
 * In charge of constructing a sysfs fallback interface for firmware loading.
 **/
static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs,
				  enum fw_opt opt_flags, long timeout)
{
	int retval = 0;
	struct device *f_dev = &fw_sysfs->dev;
	struct fw_priv *fw_priv = fw_sysfs->fw_priv;

	/* fall back on userspace loading */
	if (!fw_priv->data)
		fw_priv->is_paged_buf = true;

	dev_set_uevent_suppress(f_dev, true);

	retval = device_add(f_dev);
	if (retval) {
		dev_err(f_dev, "%s: device_register failed\n", __func__);
		goto err_put_dev;
	}

	mutex_lock(&fw_lock);
	list_add(&fw_priv->pending_list, &pending_fw_head);
	mutex_unlock(&fw_lock);

	if (opt_flags & FW_OPT_UEVENT) {
		fw_priv->need_uevent = true;
		dev_set_uevent_suppress(f_dev, false);
		dev_dbg(f_dev, "firmware: requesting %s\n", fw_priv->fw_name);
		kobject_uevent(&fw_sysfs->dev.kobj, KOBJ_ADD);
	} else {
		timeout = MAX_JIFFY_OFFSET;
	}

	retval = fw_sysfs_wait_timeout(fw_priv, timeout);
	if (retval < 0) {
		mutex_lock(&fw_lock);
		fw_load_abort(fw_sysfs);
		mutex_unlock(&fw_lock);
	}

	if (fw_state_is_aborted(fw_priv)) {
		if (retval == -ERESTARTSYS)
			retval = -EINTR;
		else
			retval = -EAGAIN;
	} else if (fw_priv->is_paged_buf && !fw_priv->data)
		retval = -ENOMEM;

	device_del(f_dev);
err_put_dev:
	put_device(f_dev);
	return retval;
}

static int fw_load_from_user_helper(struct firmware *firmware,
				    const char *name, struct device *device,
				    enum fw_opt opt_flags)
{
	struct fw_sysfs *fw_sysfs;
	long timeout;
	int ret;

	timeout = firmware_loading_timeout();
	if (opt_flags & FW_OPT_NOWAIT) {
		timeout = usermodehelper_read_lock_wait(timeout);
		if (!timeout) {
			dev_dbg(device, "firmware: %s loading timed out\n",
				name);
			return -EBUSY;
		}
	} else {
		ret = usermodehelper_read_trylock();
		if (WARN_ON(ret)) {
			dev_err(device, "firmware: %s will not be loaded\n",
				name);
			return ret;
		}
	}

	fw_sysfs = fw_create_instance(firmware, name, device, opt_flags);
	if (IS_ERR(fw_sysfs)) {
		ret = PTR_ERR(fw_sysfs);
		goto out_unlock;
	}

	fw_sysfs->fw_priv = firmware->priv;
	ret = fw_load_sysfs_fallback(fw_sysfs, opt_flags, timeout);

	if (!ret)
		ret = assign_fw(firmware, device, opt_flags);

out_unlock:
	usermodehelper_read_unlock();

	return ret;
}

static bool fw_force_sysfs_fallback(enum fw_opt opt_flags)
{
	if (fw_fallback_config.force_sysfs_fallback)
		return true;
	if (!(opt_flags & FW_OPT_USERHELPER))
		return false;
	return true;
}

static bool fw_run_sysfs_fallback(enum fw_opt opt_flags)
{
	if (fw_fallback_config.ignore_sysfs_fallback) {
		pr_info_once("Ignoring firmware sysfs fallback due to sysctl knob\n");
		return false;
	}

	if ((opt_flags & FW_OPT_NOFALLBACK))
		return false;

	return fw_force_sysfs_fallback(opt_flags);
}

/**
 * firmware_fallback_sysfs() - use the fallback mechanism to find firmware
 * @fw: pointer to firmware image
 * @name: name of firmware file to look for
 * @device: device for which firmware is being loaded
 * @opt_flags: options to control firmware loading behaviour
 * @ret: return value from direct lookup which triggered the fallback mechanism
 *
 * This function is called if direct lookup for the firmware failed, it enables
 * a fallback mechanism through userspace by exposing a sysfs loading
 * interface. Userspace is in charge of loading the firmware through the syfs
 * loading interface. This syfs fallback mechanism may be disabled completely
 * on a system by setting the proc sysctl value ignore_sysfs_fallback to true.
 * If this false we check if the internal API caller set the @FW_OPT_NOFALLBACK
 * flag, if so it would also disable the fallback mechanism. A system may want
 * to enfoce the sysfs fallback mechanism at all times, it can do this by
 * setting ignore_sysfs_fallback to false and force_sysfs_fallback to true.
 * Enabling force_sysfs_fallback is functionally equivalent to build a kernel
 * with CONFIG_FW_LOADER_USER_HELPER_FALLBACK.
 **/
int firmware_fallback_sysfs(struct firmware *fw, const char *name,
			    struct device *device,
			    enum fw_opt opt_flags,
			    int ret)
{
	if (!fw_run_sysfs_fallback(opt_flags))
		return ret;

	if (!(opt_flags & FW_OPT_NO_WARN))
		dev_warn(device, "Falling back to syfs fallback for: %s\n",
				 name);
	else
		dev_dbg(device, "Falling back to sysfs fallback for: %s\n",
				name);
	return fw_load_from_user_helper(fw, name, device, opt_flags);
}