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9ac7849e TH |
1 | /* |
2 | * drivers/base/devres.c - device resource management | |
3 | * | |
4 | * Copyright (c) 2006 SUSE Linux Products GmbH | |
5 | * Copyright (c) 2006 Tejun Heo <teheo@suse.de> | |
6 | * | |
7 | * This file is released under the GPLv2. | |
8 | */ | |
9 | ||
10 | #include <linux/device.h> | |
11 | #include <linux/module.h> | |
12 | ||
2a013455 AB |
13 | #include "base.h" |
14 | ||
9ac7849e TH |
15 | struct devres_node { |
16 | struct list_head entry; | |
17 | dr_release_t release; | |
18 | #ifdef CONFIG_DEBUG_DEVRES | |
19 | const char *name; | |
20 | size_t size; | |
21 | #endif | |
22 | }; | |
23 | ||
24 | struct devres { | |
25 | struct devres_node node; | |
26 | /* -- 3 pointers */ | |
27 | unsigned long long data[]; /* guarantee ull alignment */ | |
28 | }; | |
29 | ||
30 | struct devres_group { | |
31 | struct devres_node node[2]; | |
32 | void *id; | |
33 | int color; | |
34 | /* -- 8 pointers */ | |
35 | }; | |
36 | ||
37 | #ifdef CONFIG_DEBUG_DEVRES | |
38 | static int log_devres = 0; | |
39 | module_param_named(log, log_devres, int, S_IRUGO | S_IWUSR); | |
40 | ||
41 | static void set_node_dbginfo(struct devres_node *node, const char *name, | |
42 | size_t size) | |
43 | { | |
44 | node->name = name; | |
45 | node->size = size; | |
46 | } | |
47 | ||
48 | static void devres_log(struct device *dev, struct devres_node *node, | |
49 | const char *op) | |
50 | { | |
51 | if (unlikely(log_devres)) | |
52 | dev_printk(KERN_ERR, dev, "DEVRES %3s %p %s (%lu bytes)\n", | |
53 | op, node, node->name, (unsigned long)node->size); | |
54 | } | |
55 | #else /* CONFIG_DEBUG_DEVRES */ | |
56 | #define set_node_dbginfo(node, n, s) do {} while (0) | |
57 | #define devres_log(dev, node, op) do {} while (0) | |
58 | #endif /* CONFIG_DEBUG_DEVRES */ | |
59 | ||
60 | /* | |
61 | * Release functions for devres group. These callbacks are used only | |
62 | * for identification. | |
63 | */ | |
64 | static void group_open_release(struct device *dev, void *res) | |
65 | { | |
66 | /* noop */ | |
67 | } | |
68 | ||
69 | static void group_close_release(struct device *dev, void *res) | |
70 | { | |
71 | /* noop */ | |
72 | } | |
73 | ||
74 | static struct devres_group * node_to_group(struct devres_node *node) | |
75 | { | |
76 | if (node->release == &group_open_release) | |
77 | return container_of(node, struct devres_group, node[0]); | |
78 | if (node->release == &group_close_release) | |
79 | return container_of(node, struct devres_group, node[1]); | |
80 | return NULL; | |
81 | } | |
82 | ||
83 | static __always_inline struct devres * alloc_dr(dr_release_t release, | |
84 | size_t size, gfp_t gfp) | |
85 | { | |
86 | size_t tot_size = sizeof(struct devres) + size; | |
87 | struct devres *dr; | |
88 | ||
89 | dr = kmalloc_track_caller(tot_size, gfp); | |
90 | if (unlikely(!dr)) | |
91 | return NULL; | |
92 | ||
93 | memset(dr, 0, tot_size); | |
94 | INIT_LIST_HEAD(&dr->node.entry); | |
95 | dr->node.release = release; | |
96 | return dr; | |
97 | } | |
98 | ||
99 | static void add_dr(struct device *dev, struct devres_node *node) | |
100 | { | |
101 | devres_log(dev, node, "ADD"); | |
102 | BUG_ON(!list_empty(&node->entry)); | |
103 | list_add_tail(&node->entry, &dev->devres_head); | |
104 | } | |
105 | ||
9ac7849e TH |
106 | #ifdef CONFIG_DEBUG_DEVRES |
107 | void * __devres_alloc(dr_release_t release, size_t size, gfp_t gfp, | |
108 | const char *name) | |
109 | { | |
110 | struct devres *dr; | |
111 | ||
112 | dr = alloc_dr(release, size, gfp); | |
113 | if (unlikely(!dr)) | |
114 | return NULL; | |
115 | set_node_dbginfo(&dr->node, name, size); | |
116 | return dr->data; | |
117 | } | |
118 | EXPORT_SYMBOL_GPL(__devres_alloc); | |
119 | #else | |
d3e6975e RD |
120 | /** |
121 | * devres_alloc - Allocate device resource data | |
122 | * @release: Release function devres will be associated with | |
123 | * @size: Allocation size | |
124 | * @gfp: Allocation flags | |
125 | * | |
126 | * Allocate devres of @size bytes. The allocated area is zeroed, then | |
127 | * associated with @release. The returned pointer can be passed to | |
128 | * other devres_*() functions. | |
129 | * | |
130 | * RETURNS: | |
131 | * Pointer to allocated devres on success, NULL on failure. | |
132 | */ | |
9ac7849e TH |
133 | void * devres_alloc(dr_release_t release, size_t size, gfp_t gfp) |
134 | { | |
135 | struct devres *dr; | |
136 | ||
137 | dr = alloc_dr(release, size, gfp); | |
138 | if (unlikely(!dr)) | |
139 | return NULL; | |
140 | return dr->data; | |
141 | } | |
142 | EXPORT_SYMBOL_GPL(devres_alloc); | |
143 | #endif | |
144 | ||
145 | /** | |
146 | * devres_free - Free device resource data | |
147 | * @res: Pointer to devres data to free | |
148 | * | |
149 | * Free devres created with devres_alloc(). | |
150 | */ | |
151 | void devres_free(void *res) | |
152 | { | |
153 | if (res) { | |
154 | struct devres *dr = container_of(res, struct devres, data); | |
155 | ||
156 | BUG_ON(!list_empty(&dr->node.entry)); | |
157 | kfree(dr); | |
158 | } | |
159 | } | |
160 | EXPORT_SYMBOL_GPL(devres_free); | |
161 | ||
162 | /** | |
163 | * devres_add - Register device resource | |
164 | * @dev: Device to add resource to | |
165 | * @res: Resource to register | |
166 | * | |
167 | * Register devres @res to @dev. @res should have been allocated | |
168 | * using devres_alloc(). On driver detach, the associated release | |
169 | * function will be invoked and devres will be freed automatically. | |
170 | */ | |
171 | void devres_add(struct device *dev, void *res) | |
172 | { | |
173 | struct devres *dr = container_of(res, struct devres, data); | |
174 | unsigned long flags; | |
175 | ||
176 | spin_lock_irqsave(&dev->devres_lock, flags); | |
177 | add_dr(dev, &dr->node); | |
178 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
179 | } | |
180 | EXPORT_SYMBOL_GPL(devres_add); | |
181 | ||
182 | static struct devres *find_dr(struct device *dev, dr_release_t release, | |
183 | dr_match_t match, void *match_data) | |
184 | { | |
185 | struct devres_node *node; | |
186 | ||
187 | list_for_each_entry_reverse(node, &dev->devres_head, entry) { | |
188 | struct devres *dr = container_of(node, struct devres, node); | |
189 | ||
190 | if (node->release != release) | |
191 | continue; | |
192 | if (match && !match(dev, dr->data, match_data)) | |
193 | continue; | |
194 | return dr; | |
195 | } | |
196 | ||
197 | return NULL; | |
198 | } | |
199 | ||
200 | /** | |
201 | * devres_find - Find device resource | |
202 | * @dev: Device to lookup resource from | |
203 | * @release: Look for resources associated with this release function | |
204 | * @match: Match function (optional) | |
205 | * @match_data: Data for the match function | |
206 | * | |
207 | * Find the latest devres of @dev which is associated with @release | |
208 | * and for which @match returns 1. If @match is NULL, it's considered | |
209 | * to match all. | |
210 | * | |
211 | * RETURNS: | |
212 | * Pointer to found devres, NULL if not found. | |
213 | */ | |
214 | void * devres_find(struct device *dev, dr_release_t release, | |
215 | dr_match_t match, void *match_data) | |
216 | { | |
217 | struct devres *dr; | |
218 | unsigned long flags; | |
219 | ||
220 | spin_lock_irqsave(&dev->devres_lock, flags); | |
221 | dr = find_dr(dev, release, match, match_data); | |
222 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
223 | ||
224 | if (dr) | |
225 | return dr->data; | |
226 | return NULL; | |
227 | } | |
228 | EXPORT_SYMBOL_GPL(devres_find); | |
229 | ||
230 | /** | |
231 | * devres_get - Find devres, if non-existent, add one atomically | |
232 | * @dev: Device to lookup or add devres for | |
233 | * @new_res: Pointer to new initialized devres to add if not found | |
234 | * @match: Match function (optional) | |
235 | * @match_data: Data for the match function | |
236 | * | |
237 | * Find the latest devres of @dev which has the same release function | |
238 | * as @new_res and for which @match return 1. If found, @new_res is | |
239 | * freed; otherwise, @new_res is added atomically. | |
240 | * | |
241 | * RETURNS: | |
242 | * Pointer to found or added devres. | |
243 | */ | |
244 | void * devres_get(struct device *dev, void *new_res, | |
245 | dr_match_t match, void *match_data) | |
246 | { | |
247 | struct devres *new_dr = container_of(new_res, struct devres, data); | |
248 | struct devres *dr; | |
249 | unsigned long flags; | |
250 | ||
251 | spin_lock_irqsave(&dev->devres_lock, flags); | |
252 | dr = find_dr(dev, new_dr->node.release, match, match_data); | |
253 | if (!dr) { | |
254 | add_dr(dev, &new_dr->node); | |
255 | dr = new_dr; | |
256 | new_dr = NULL; | |
257 | } | |
258 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
259 | devres_free(new_dr); | |
260 | ||
261 | return dr->data; | |
262 | } | |
263 | EXPORT_SYMBOL_GPL(devres_get); | |
264 | ||
265 | /** | |
266 | * devres_remove - Find a device resource and remove it | |
267 | * @dev: Device to find resource from | |
268 | * @release: Look for resources associated with this release function | |
269 | * @match: Match function (optional) | |
270 | * @match_data: Data for the match function | |
271 | * | |
272 | * Find the latest devres of @dev associated with @release and for | |
273 | * which @match returns 1. If @match is NULL, it's considered to | |
274 | * match all. If found, the resource is removed atomically and | |
275 | * returned. | |
276 | * | |
277 | * RETURNS: | |
278 | * Pointer to removed devres on success, NULL if not found. | |
279 | */ | |
280 | void * devres_remove(struct device *dev, dr_release_t release, | |
281 | dr_match_t match, void *match_data) | |
282 | { | |
283 | struct devres *dr; | |
284 | unsigned long flags; | |
285 | ||
286 | spin_lock_irqsave(&dev->devres_lock, flags); | |
287 | dr = find_dr(dev, release, match, match_data); | |
288 | if (dr) { | |
289 | list_del_init(&dr->node.entry); | |
290 | devres_log(dev, &dr->node, "REM"); | |
291 | } | |
292 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
293 | ||
294 | if (dr) | |
295 | return dr->data; | |
296 | return NULL; | |
297 | } | |
298 | EXPORT_SYMBOL_GPL(devres_remove); | |
299 | ||
300 | /** | |
301 | * devres_destroy - Find a device resource and destroy it | |
302 | * @dev: Device to find resource from | |
303 | * @release: Look for resources associated with this release function | |
304 | * @match: Match function (optional) | |
305 | * @match_data: Data for the match function | |
306 | * | |
307 | * Find the latest devres of @dev associated with @release and for | |
308 | * which @match returns 1. If @match is NULL, it's considered to | |
309 | * match all. If found, the resource is removed atomically and freed. | |
310 | * | |
311 | * RETURNS: | |
312 | * 0 if devres is found and freed, -ENOENT if not found. | |
313 | */ | |
314 | int devres_destroy(struct device *dev, dr_release_t release, | |
315 | dr_match_t match, void *match_data) | |
316 | { | |
317 | void *res; | |
318 | ||
319 | res = devres_remove(dev, release, match, match_data); | |
320 | if (unlikely(!res)) | |
321 | return -ENOENT; | |
322 | ||
323 | devres_free(res); | |
324 | return 0; | |
325 | } | |
326 | EXPORT_SYMBOL_GPL(devres_destroy); | |
327 | ||
328 | static int remove_nodes(struct device *dev, | |
329 | struct list_head *first, struct list_head *end, | |
330 | struct list_head *todo) | |
331 | { | |
332 | int cnt = 0, nr_groups = 0; | |
333 | struct list_head *cur; | |
334 | ||
335 | /* First pass - move normal devres entries to @todo and clear | |
336 | * devres_group colors. | |
337 | */ | |
338 | cur = first; | |
339 | while (cur != end) { | |
340 | struct devres_node *node; | |
341 | struct devres_group *grp; | |
342 | ||
343 | node = list_entry(cur, struct devres_node, entry); | |
344 | cur = cur->next; | |
345 | ||
346 | grp = node_to_group(node); | |
347 | if (grp) { | |
348 | /* clear color of group markers in the first pass */ | |
349 | grp->color = 0; | |
350 | nr_groups++; | |
351 | } else { | |
352 | /* regular devres entry */ | |
353 | if (&node->entry == first) | |
354 | first = first->next; | |
355 | list_move_tail(&node->entry, todo); | |
356 | cnt++; | |
357 | } | |
358 | } | |
359 | ||
360 | if (!nr_groups) | |
361 | return cnt; | |
362 | ||
363 | /* Second pass - Scan groups and color them. A group gets | |
364 | * color value of two iff the group is wholly contained in | |
365 | * [cur, end). That is, for a closed group, both opening and | |
366 | * closing markers should be in the range, while just the | |
367 | * opening marker is enough for an open group. | |
368 | */ | |
369 | cur = first; | |
370 | while (cur != end) { | |
371 | struct devres_node *node; | |
372 | struct devres_group *grp; | |
373 | ||
374 | node = list_entry(cur, struct devres_node, entry); | |
375 | cur = cur->next; | |
376 | ||
377 | grp = node_to_group(node); | |
378 | BUG_ON(!grp || list_empty(&grp->node[0].entry)); | |
379 | ||
380 | grp->color++; | |
381 | if (list_empty(&grp->node[1].entry)) | |
382 | grp->color++; | |
383 | ||
384 | BUG_ON(grp->color <= 0 || grp->color > 2); | |
385 | if (grp->color == 2) { | |
386 | /* No need to update cur or end. The removed | |
387 | * nodes are always before both. | |
388 | */ | |
389 | list_move_tail(&grp->node[0].entry, todo); | |
390 | list_del_init(&grp->node[1].entry); | |
391 | } | |
392 | } | |
393 | ||
394 | return cnt; | |
395 | } | |
396 | ||
397 | static int release_nodes(struct device *dev, struct list_head *first, | |
398 | struct list_head *end, unsigned long flags) | |
399 | { | |
400 | LIST_HEAD(todo); | |
401 | int cnt; | |
402 | struct devres *dr, *tmp; | |
403 | ||
404 | cnt = remove_nodes(dev, first, end, &todo); | |
405 | ||
406 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
407 | ||
408 | /* Release. Note that both devres and devres_group are | |
409 | * handled as devres in the following loop. This is safe. | |
410 | */ | |
411 | list_for_each_entry_safe_reverse(dr, tmp, &todo, node.entry) { | |
412 | devres_log(dev, &dr->node, "REL"); | |
413 | dr->node.release(dev, dr->data); | |
414 | kfree(dr); | |
415 | } | |
416 | ||
417 | return cnt; | |
418 | } | |
419 | ||
420 | /** | |
d3e6975e | 421 | * devres_release_all - Release all managed resources |
9ac7849e TH |
422 | * @dev: Device to release resources for |
423 | * | |
424 | * Release all resources associated with @dev. This function is | |
425 | * called on driver detach. | |
426 | */ | |
427 | int devres_release_all(struct device *dev) | |
428 | { | |
429 | unsigned long flags; | |
430 | ||
431 | spin_lock_irqsave(&dev->devres_lock, flags); | |
432 | return release_nodes(dev, dev->devres_head.next, &dev->devres_head, | |
433 | flags); | |
434 | } | |
435 | ||
436 | /** | |
437 | * devres_open_group - Open a new devres group | |
438 | * @dev: Device to open devres group for | |
439 | * @id: Separator ID | |
440 | * @gfp: Allocation flags | |
441 | * | |
442 | * Open a new devres group for @dev with @id. For @id, using a | |
443 | * pointer to an object which won't be used for another group is | |
444 | * recommended. If @id is NULL, address-wise unique ID is created. | |
445 | * | |
446 | * RETURNS: | |
447 | * ID of the new group, NULL on failure. | |
448 | */ | |
449 | void * devres_open_group(struct device *dev, void *id, gfp_t gfp) | |
450 | { | |
451 | struct devres_group *grp; | |
452 | unsigned long flags; | |
453 | ||
454 | grp = kmalloc(sizeof(*grp), gfp); | |
455 | if (unlikely(!grp)) | |
456 | return NULL; | |
457 | ||
458 | grp->node[0].release = &group_open_release; | |
459 | grp->node[1].release = &group_close_release; | |
460 | INIT_LIST_HEAD(&grp->node[0].entry); | |
461 | INIT_LIST_HEAD(&grp->node[1].entry); | |
462 | set_node_dbginfo(&grp->node[0], "grp<", 0); | |
463 | set_node_dbginfo(&grp->node[1], "grp>", 0); | |
464 | grp->id = grp; | |
465 | if (id) | |
466 | grp->id = id; | |
467 | ||
468 | spin_lock_irqsave(&dev->devres_lock, flags); | |
469 | add_dr(dev, &grp->node[0]); | |
470 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
471 | return grp->id; | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(devres_open_group); | |
474 | ||
475 | /* Find devres group with ID @id. If @id is NULL, look for the latest. */ | |
476 | static struct devres_group * find_group(struct device *dev, void *id) | |
477 | { | |
478 | struct devres_node *node; | |
479 | ||
480 | list_for_each_entry_reverse(node, &dev->devres_head, entry) { | |
481 | struct devres_group *grp; | |
482 | ||
483 | if (node->release != &group_open_release) | |
484 | continue; | |
485 | ||
486 | grp = container_of(node, struct devres_group, node[0]); | |
487 | ||
488 | if (id) { | |
489 | if (grp->id == id) | |
490 | return grp; | |
491 | } else if (list_empty(&grp->node[1].entry)) | |
492 | return grp; | |
493 | } | |
494 | ||
495 | return NULL; | |
496 | } | |
497 | ||
498 | /** | |
499 | * devres_close_group - Close a devres group | |
500 | * @dev: Device to close devres group for | |
501 | * @id: ID of target group, can be NULL | |
502 | * | |
503 | * Close the group identified by @id. If @id is NULL, the latest open | |
504 | * group is selected. | |
505 | */ | |
506 | void devres_close_group(struct device *dev, void *id) | |
507 | { | |
508 | struct devres_group *grp; | |
509 | unsigned long flags; | |
510 | ||
511 | spin_lock_irqsave(&dev->devres_lock, flags); | |
512 | ||
513 | grp = find_group(dev, id); | |
514 | if (grp) | |
515 | add_dr(dev, &grp->node[1]); | |
516 | else | |
517 | WARN_ON(1); | |
518 | ||
519 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
520 | } | |
521 | EXPORT_SYMBOL_GPL(devres_close_group); | |
522 | ||
523 | /** | |
524 | * devres_remove_group - Remove a devres group | |
525 | * @dev: Device to remove group for | |
526 | * @id: ID of target group, can be NULL | |
527 | * | |
528 | * Remove the group identified by @id. If @id is NULL, the latest | |
529 | * open group is selected. Note that removing a group doesn't affect | |
530 | * any other resources. | |
531 | */ | |
532 | void devres_remove_group(struct device *dev, void *id) | |
533 | { | |
534 | struct devres_group *grp; | |
535 | unsigned long flags; | |
536 | ||
537 | spin_lock_irqsave(&dev->devres_lock, flags); | |
538 | ||
539 | grp = find_group(dev, id); | |
540 | if (grp) { | |
541 | list_del_init(&grp->node[0].entry); | |
542 | list_del_init(&grp->node[1].entry); | |
543 | devres_log(dev, &grp->node[0], "REM"); | |
544 | } else | |
545 | WARN_ON(1); | |
546 | ||
547 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
548 | ||
549 | kfree(grp); | |
550 | } | |
551 | EXPORT_SYMBOL_GPL(devres_remove_group); | |
552 | ||
553 | /** | |
554 | * devres_release_group - Release resources in a devres group | |
555 | * @dev: Device to release group for | |
556 | * @id: ID of target group, can be NULL | |
557 | * | |
558 | * Release all resources in the group identified by @id. If @id is | |
559 | * NULL, the latest open group is selected. The selected group and | |
560 | * groups properly nested inside the selected group are removed. | |
561 | * | |
562 | * RETURNS: | |
563 | * The number of released non-group resources. | |
564 | */ | |
565 | int devres_release_group(struct device *dev, void *id) | |
566 | { | |
567 | struct devres_group *grp; | |
568 | unsigned long flags; | |
569 | int cnt = 0; | |
570 | ||
571 | spin_lock_irqsave(&dev->devres_lock, flags); | |
572 | ||
573 | grp = find_group(dev, id); | |
574 | if (grp) { | |
575 | struct list_head *first = &grp->node[0].entry; | |
576 | struct list_head *end = &dev->devres_head; | |
577 | ||
578 | if (!list_empty(&grp->node[1].entry)) | |
579 | end = grp->node[1].entry.next; | |
580 | ||
581 | cnt = release_nodes(dev, first, end, flags); | |
582 | } else { | |
583 | WARN_ON(1); | |
584 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
585 | } | |
586 | ||
587 | return cnt; | |
588 | } | |
589 | EXPORT_SYMBOL_GPL(devres_release_group); | |
590 | ||
591 | /* | |
592 | * Managed kzalloc/kfree | |
593 | */ | |
594 | static void devm_kzalloc_release(struct device *dev, void *res) | |
595 | { | |
596 | /* noop */ | |
597 | } | |
598 | ||
599 | static int devm_kzalloc_match(struct device *dev, void *res, void *data) | |
600 | { | |
601 | return res == data; | |
602 | } | |
603 | ||
604 | /** | |
d3e6975e | 605 | * devm_kzalloc - Resource-managed kzalloc |
9ac7849e TH |
606 | * @dev: Device to allocate memory for |
607 | * @size: Allocation size | |
608 | * @gfp: Allocation gfp flags | |
609 | * | |
610 | * Managed kzalloc. Memory allocated with this function is | |
611 | * automatically freed on driver detach. Like all other devres | |
612 | * resources, guaranteed alignment is unsigned long long. | |
613 | * | |
614 | * RETURNS: | |
615 | * Pointer to allocated memory on success, NULL on failure. | |
616 | */ | |
617 | void * devm_kzalloc(struct device *dev, size_t size, gfp_t gfp) | |
618 | { | |
619 | struct devres *dr; | |
620 | ||
621 | /* use raw alloc_dr for kmalloc caller tracing */ | |
622 | dr = alloc_dr(devm_kzalloc_release, size, gfp); | |
623 | if (unlikely(!dr)) | |
624 | return NULL; | |
625 | ||
626 | set_node_dbginfo(&dr->node, "devm_kzalloc_release", size); | |
627 | devres_add(dev, dr->data); | |
628 | return dr->data; | |
629 | } | |
630 | EXPORT_SYMBOL_GPL(devm_kzalloc); | |
631 | ||
632 | /** | |
d3e6975e | 633 | * devm_kfree - Resource-managed kfree |
9ac7849e TH |
634 | * @dev: Device this memory belongs to |
635 | * @p: Memory to free | |
636 | * | |
637 | * Free memory allocated with dev_kzalloc(). | |
638 | */ | |
639 | void devm_kfree(struct device *dev, void *p) | |
640 | { | |
641 | int rc; | |
642 | ||
643 | rc = devres_destroy(dev, devm_kzalloc_release, devm_kzalloc_match, p); | |
644 | WARN_ON(rc); | |
645 | } | |
646 | EXPORT_SYMBOL_GPL(devm_kfree); |