Commit | Line | Data |
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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> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
9ac7849e | 13 | |
2a013455 AB |
14 | #include "base.h" |
15 | ||
9ac7849e TH |
16 | struct devres_node { |
17 | struct list_head entry; | |
18 | dr_release_t release; | |
19 | #ifdef CONFIG_DEBUG_DEVRES | |
20 | const char *name; | |
21 | size_t size; | |
22 | #endif | |
23 | }; | |
24 | ||
25 | struct devres { | |
26 | struct devres_node node; | |
27 | /* -- 3 pointers */ | |
28 | unsigned long long data[]; /* guarantee ull alignment */ | |
29 | }; | |
30 | ||
31 | struct devres_group { | |
32 | struct devres_node node[2]; | |
33 | void *id; | |
34 | int color; | |
35 | /* -- 8 pointers */ | |
36 | }; | |
37 | ||
38 | #ifdef CONFIG_DEBUG_DEVRES | |
39 | static int log_devres = 0; | |
40 | module_param_named(log, log_devres, int, S_IRUGO | S_IWUSR); | |
41 | ||
42 | static void set_node_dbginfo(struct devres_node *node, const char *name, | |
43 | size_t size) | |
44 | { | |
45 | node->name = name; | |
46 | node->size = size; | |
47 | } | |
48 | ||
49 | static void devres_log(struct device *dev, struct devres_node *node, | |
50 | const char *op) | |
51 | { | |
52 | if (unlikely(log_devres)) | |
53 | dev_printk(KERN_ERR, dev, "DEVRES %3s %p %s (%lu bytes)\n", | |
54 | op, node, node->name, (unsigned long)node->size); | |
55 | } | |
56 | #else /* CONFIG_DEBUG_DEVRES */ | |
57 | #define set_node_dbginfo(node, n, s) do {} while (0) | |
58 | #define devres_log(dev, node, op) do {} while (0) | |
59 | #endif /* CONFIG_DEBUG_DEVRES */ | |
60 | ||
61 | /* | |
62 | * Release functions for devres group. These callbacks are used only | |
63 | * for identification. | |
64 | */ | |
65 | static void group_open_release(struct device *dev, void *res) | |
66 | { | |
67 | /* noop */ | |
68 | } | |
69 | ||
70 | static void group_close_release(struct device *dev, void *res) | |
71 | { | |
72 | /* noop */ | |
73 | } | |
74 | ||
75 | static struct devres_group * node_to_group(struct devres_node *node) | |
76 | { | |
77 | if (node->release == &group_open_release) | |
78 | return container_of(node, struct devres_group, node[0]); | |
79 | if (node->release == &group_close_release) | |
80 | return container_of(node, struct devres_group, node[1]); | |
81 | return NULL; | |
82 | } | |
83 | ||
84 | static __always_inline struct devres * alloc_dr(dr_release_t release, | |
85 | size_t size, gfp_t gfp) | |
86 | { | |
87 | size_t tot_size = sizeof(struct devres) + size; | |
88 | struct devres *dr; | |
89 | ||
90 | dr = kmalloc_track_caller(tot_size, gfp); | |
91 | if (unlikely(!dr)) | |
92 | return NULL; | |
93 | ||
94 | memset(dr, 0, tot_size); | |
95 | INIT_LIST_HEAD(&dr->node.entry); | |
96 | dr->node.release = release; | |
97 | return dr; | |
98 | } | |
99 | ||
100 | static void add_dr(struct device *dev, struct devres_node *node) | |
101 | { | |
102 | devres_log(dev, node, "ADD"); | |
103 | BUG_ON(!list_empty(&node->entry)); | |
104 | list_add_tail(&node->entry, &dev->devres_head); | |
105 | } | |
106 | ||
9ac7849e TH |
107 | #ifdef CONFIG_DEBUG_DEVRES |
108 | void * __devres_alloc(dr_release_t release, size_t size, gfp_t gfp, | |
109 | const char *name) | |
110 | { | |
111 | struct devres *dr; | |
112 | ||
113 | dr = alloc_dr(release, size, gfp); | |
114 | if (unlikely(!dr)) | |
115 | return NULL; | |
116 | set_node_dbginfo(&dr->node, name, size); | |
117 | return dr->data; | |
118 | } | |
119 | EXPORT_SYMBOL_GPL(__devres_alloc); | |
120 | #else | |
d3e6975e RD |
121 | /** |
122 | * devres_alloc - Allocate device resource data | |
123 | * @release: Release function devres will be associated with | |
124 | * @size: Allocation size | |
125 | * @gfp: Allocation flags | |
126 | * | |
127 | * Allocate devres of @size bytes. The allocated area is zeroed, then | |
128 | * associated with @release. The returned pointer can be passed to | |
129 | * other devres_*() functions. | |
130 | * | |
131 | * RETURNS: | |
132 | * Pointer to allocated devres on success, NULL on failure. | |
133 | */ | |
9ac7849e TH |
134 | void * devres_alloc(dr_release_t release, size_t size, gfp_t gfp) |
135 | { | |
136 | struct devres *dr; | |
137 | ||
138 | dr = alloc_dr(release, size, gfp); | |
139 | if (unlikely(!dr)) | |
140 | return NULL; | |
141 | return dr->data; | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(devres_alloc); | |
144 | #endif | |
145 | ||
146 | /** | |
147 | * devres_free - Free device resource data | |
148 | * @res: Pointer to devres data to free | |
149 | * | |
150 | * Free devres created with devres_alloc(). | |
151 | */ | |
152 | void devres_free(void *res) | |
153 | { | |
154 | if (res) { | |
155 | struct devres *dr = container_of(res, struct devres, data); | |
156 | ||
157 | BUG_ON(!list_empty(&dr->node.entry)); | |
158 | kfree(dr); | |
159 | } | |
160 | } | |
161 | EXPORT_SYMBOL_GPL(devres_free); | |
162 | ||
163 | /** | |
164 | * devres_add - Register device resource | |
165 | * @dev: Device to add resource to | |
166 | * @res: Resource to register | |
167 | * | |
168 | * Register devres @res to @dev. @res should have been allocated | |
169 | * using devres_alloc(). On driver detach, the associated release | |
170 | * function will be invoked and devres will be freed automatically. | |
171 | */ | |
172 | void devres_add(struct device *dev, void *res) | |
173 | { | |
174 | struct devres *dr = container_of(res, struct devres, data); | |
175 | unsigned long flags; | |
176 | ||
177 | spin_lock_irqsave(&dev->devres_lock, flags); | |
178 | add_dr(dev, &dr->node); | |
179 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
180 | } | |
181 | EXPORT_SYMBOL_GPL(devres_add); | |
182 | ||
183 | static struct devres *find_dr(struct device *dev, dr_release_t release, | |
184 | dr_match_t match, void *match_data) | |
185 | { | |
186 | struct devres_node *node; | |
187 | ||
188 | list_for_each_entry_reverse(node, &dev->devres_head, entry) { | |
189 | struct devres *dr = container_of(node, struct devres, node); | |
190 | ||
191 | if (node->release != release) | |
192 | continue; | |
193 | if (match && !match(dev, dr->data, match_data)) | |
194 | continue; | |
195 | return dr; | |
196 | } | |
197 | ||
198 | return NULL; | |
199 | } | |
200 | ||
201 | /** | |
202 | * devres_find - Find device resource | |
203 | * @dev: Device to lookup resource from | |
204 | * @release: Look for resources associated with this release function | |
205 | * @match: Match function (optional) | |
206 | * @match_data: Data for the match function | |
207 | * | |
208 | * Find the latest devres of @dev which is associated with @release | |
209 | * and for which @match returns 1. If @match is NULL, it's considered | |
210 | * to match all. | |
211 | * | |
212 | * RETURNS: | |
213 | * Pointer to found devres, NULL if not found. | |
214 | */ | |
215 | void * devres_find(struct device *dev, dr_release_t release, | |
216 | dr_match_t match, void *match_data) | |
217 | { | |
218 | struct devres *dr; | |
219 | unsigned long flags; | |
220 | ||
221 | spin_lock_irqsave(&dev->devres_lock, flags); | |
222 | dr = find_dr(dev, release, match, match_data); | |
223 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
224 | ||
225 | if (dr) | |
226 | return dr->data; | |
227 | return NULL; | |
228 | } | |
229 | EXPORT_SYMBOL_GPL(devres_find); | |
230 | ||
231 | /** | |
232 | * devres_get - Find devres, if non-existent, add one atomically | |
233 | * @dev: Device to lookup or add devres for | |
234 | * @new_res: Pointer to new initialized devres to add if not found | |
235 | * @match: Match function (optional) | |
236 | * @match_data: Data for the match function | |
237 | * | |
238 | * Find the latest devres of @dev which has the same release function | |
239 | * as @new_res and for which @match return 1. If found, @new_res is | |
240 | * freed; otherwise, @new_res is added atomically. | |
241 | * | |
242 | * RETURNS: | |
243 | * Pointer to found or added devres. | |
244 | */ | |
245 | void * devres_get(struct device *dev, void *new_res, | |
246 | dr_match_t match, void *match_data) | |
247 | { | |
248 | struct devres *new_dr = container_of(new_res, struct devres, data); | |
249 | struct devres *dr; | |
250 | unsigned long flags; | |
251 | ||
252 | spin_lock_irqsave(&dev->devres_lock, flags); | |
253 | dr = find_dr(dev, new_dr->node.release, match, match_data); | |
254 | if (!dr) { | |
255 | add_dr(dev, &new_dr->node); | |
256 | dr = new_dr; | |
257 | new_dr = NULL; | |
258 | } | |
259 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
260 | devres_free(new_dr); | |
261 | ||
262 | return dr->data; | |
263 | } | |
264 | EXPORT_SYMBOL_GPL(devres_get); | |
265 | ||
266 | /** | |
267 | * devres_remove - Find a device resource and remove it | |
268 | * @dev: Device to find resource from | |
269 | * @release: Look for resources associated with this release function | |
270 | * @match: Match function (optional) | |
271 | * @match_data: Data for the match function | |
272 | * | |
273 | * Find the latest devres of @dev associated with @release and for | |
274 | * which @match returns 1. If @match is NULL, it's considered to | |
275 | * match all. If found, the resource is removed atomically and | |
276 | * returned. | |
277 | * | |
278 | * RETURNS: | |
279 | * Pointer to removed devres on success, NULL if not found. | |
280 | */ | |
281 | void * devres_remove(struct device *dev, dr_release_t release, | |
282 | dr_match_t match, void *match_data) | |
283 | { | |
284 | struct devres *dr; | |
285 | unsigned long flags; | |
286 | ||
287 | spin_lock_irqsave(&dev->devres_lock, flags); | |
288 | dr = find_dr(dev, release, match, match_data); | |
289 | if (dr) { | |
290 | list_del_init(&dr->node.entry); | |
291 | devres_log(dev, &dr->node, "REM"); | |
292 | } | |
293 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
294 | ||
295 | if (dr) | |
296 | return dr->data; | |
297 | return NULL; | |
298 | } | |
299 | EXPORT_SYMBOL_GPL(devres_remove); | |
300 | ||
301 | /** | |
302 | * devres_destroy - Find a device resource and destroy it | |
303 | * @dev: Device to find resource from | |
304 | * @release: Look for resources associated with this release function | |
305 | * @match: Match function (optional) | |
306 | * @match_data: Data for the match function | |
307 | * | |
308 | * Find the latest devres of @dev associated with @release and for | |
309 | * which @match returns 1. If @match is NULL, it's considered to | |
310 | * match all. If found, the resource is removed atomically and freed. | |
311 | * | |
698cd2dd MB |
312 | * Note that the release function for the resource will not be called, |
313 | * only the devres-allocated data will be freed. The caller becomes | |
314 | * responsible for freeing any other data. | |
315 | * | |
9ac7849e TH |
316 | * RETURNS: |
317 | * 0 if devres is found and freed, -ENOENT if not found. | |
318 | */ | |
319 | int devres_destroy(struct device *dev, dr_release_t release, | |
320 | dr_match_t match, void *match_data) | |
321 | { | |
322 | void *res; | |
323 | ||
324 | res = devres_remove(dev, release, match, match_data); | |
325 | if (unlikely(!res)) | |
326 | return -ENOENT; | |
327 | ||
328 | devres_free(res); | |
329 | return 0; | |
330 | } | |
331 | EXPORT_SYMBOL_GPL(devres_destroy); | |
332 | ||
d926d0e4 MB |
333 | |
334 | /** | |
335 | * devres_release - Find a device resource and destroy it, calling release | |
336 | * @dev: Device to find resource from | |
337 | * @release: Look for resources associated with this release function | |
338 | * @match: Match function (optional) | |
339 | * @match_data: Data for the match function | |
340 | * | |
341 | * Find the latest devres of @dev associated with @release and for | |
342 | * which @match returns 1. If @match is NULL, it's considered to | |
343 | * match all. If found, the resource is removed atomically, the | |
344 | * release function called and the resource freed. | |
345 | * | |
346 | * RETURNS: | |
347 | * 0 if devres is found and freed, -ENOENT if not found. | |
348 | */ | |
349 | int devres_release(struct device *dev, dr_release_t release, | |
350 | dr_match_t match, void *match_data) | |
351 | { | |
352 | void *res; | |
353 | ||
354 | res = devres_remove(dev, release, match, match_data); | |
355 | if (unlikely(!res)) | |
356 | return -ENOENT; | |
357 | ||
358 | (*release)(dev, res); | |
359 | devres_free(res); | |
360 | return 0; | |
361 | } | |
362 | EXPORT_SYMBOL_GPL(devres_release); | |
363 | ||
9ac7849e TH |
364 | static int remove_nodes(struct device *dev, |
365 | struct list_head *first, struct list_head *end, | |
366 | struct list_head *todo) | |
367 | { | |
368 | int cnt = 0, nr_groups = 0; | |
369 | struct list_head *cur; | |
370 | ||
371 | /* First pass - move normal devres entries to @todo and clear | |
372 | * devres_group colors. | |
373 | */ | |
374 | cur = first; | |
375 | while (cur != end) { | |
376 | struct devres_node *node; | |
377 | struct devres_group *grp; | |
378 | ||
379 | node = list_entry(cur, struct devres_node, entry); | |
380 | cur = cur->next; | |
381 | ||
382 | grp = node_to_group(node); | |
383 | if (grp) { | |
384 | /* clear color of group markers in the first pass */ | |
385 | grp->color = 0; | |
386 | nr_groups++; | |
387 | } else { | |
388 | /* regular devres entry */ | |
389 | if (&node->entry == first) | |
390 | first = first->next; | |
391 | list_move_tail(&node->entry, todo); | |
392 | cnt++; | |
393 | } | |
394 | } | |
395 | ||
396 | if (!nr_groups) | |
397 | return cnt; | |
398 | ||
399 | /* Second pass - Scan groups and color them. A group gets | |
400 | * color value of two iff the group is wholly contained in | |
401 | * [cur, end). That is, for a closed group, both opening and | |
402 | * closing markers should be in the range, while just the | |
403 | * opening marker is enough for an open group. | |
404 | */ | |
405 | cur = first; | |
406 | while (cur != end) { | |
407 | struct devres_node *node; | |
408 | struct devres_group *grp; | |
409 | ||
410 | node = list_entry(cur, struct devres_node, entry); | |
411 | cur = cur->next; | |
412 | ||
413 | grp = node_to_group(node); | |
414 | BUG_ON(!grp || list_empty(&grp->node[0].entry)); | |
415 | ||
416 | grp->color++; | |
417 | if (list_empty(&grp->node[1].entry)) | |
418 | grp->color++; | |
419 | ||
420 | BUG_ON(grp->color <= 0 || grp->color > 2); | |
421 | if (grp->color == 2) { | |
422 | /* No need to update cur or end. The removed | |
423 | * nodes are always before both. | |
424 | */ | |
425 | list_move_tail(&grp->node[0].entry, todo); | |
426 | list_del_init(&grp->node[1].entry); | |
427 | } | |
428 | } | |
429 | ||
430 | return cnt; | |
431 | } | |
432 | ||
433 | static int release_nodes(struct device *dev, struct list_head *first, | |
434 | struct list_head *end, unsigned long flags) | |
86ec67fd | 435 | __releases(&dev->devres_lock) |
9ac7849e TH |
436 | { |
437 | LIST_HEAD(todo); | |
438 | int cnt; | |
439 | struct devres *dr, *tmp; | |
440 | ||
441 | cnt = remove_nodes(dev, first, end, &todo); | |
442 | ||
443 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
444 | ||
445 | /* Release. Note that both devres and devres_group are | |
446 | * handled as devres in the following loop. This is safe. | |
447 | */ | |
448 | list_for_each_entry_safe_reverse(dr, tmp, &todo, node.entry) { | |
449 | devres_log(dev, &dr->node, "REL"); | |
450 | dr->node.release(dev, dr->data); | |
451 | kfree(dr); | |
452 | } | |
453 | ||
454 | return cnt; | |
455 | } | |
456 | ||
457 | /** | |
d3e6975e | 458 | * devres_release_all - Release all managed resources |
9ac7849e TH |
459 | * @dev: Device to release resources for |
460 | * | |
461 | * Release all resources associated with @dev. This function is | |
462 | * called on driver detach. | |
463 | */ | |
464 | int devres_release_all(struct device *dev) | |
465 | { | |
466 | unsigned long flags; | |
467 | ||
eb8d3c60 BH |
468 | /* Looks like an uninitialized device structure */ |
469 | if (WARN_ON(dev->devres_head.next == NULL)) | |
470 | return -ENODEV; | |
9ac7849e TH |
471 | spin_lock_irqsave(&dev->devres_lock, flags); |
472 | return release_nodes(dev, dev->devres_head.next, &dev->devres_head, | |
473 | flags); | |
474 | } | |
475 | ||
476 | /** | |
477 | * devres_open_group - Open a new devres group | |
478 | * @dev: Device to open devres group for | |
479 | * @id: Separator ID | |
480 | * @gfp: Allocation flags | |
481 | * | |
482 | * Open a new devres group for @dev with @id. For @id, using a | |
483 | * pointer to an object which won't be used for another group is | |
484 | * recommended. If @id is NULL, address-wise unique ID is created. | |
485 | * | |
486 | * RETURNS: | |
487 | * ID of the new group, NULL on failure. | |
488 | */ | |
489 | void * devres_open_group(struct device *dev, void *id, gfp_t gfp) | |
490 | { | |
491 | struct devres_group *grp; | |
492 | unsigned long flags; | |
493 | ||
494 | grp = kmalloc(sizeof(*grp), gfp); | |
495 | if (unlikely(!grp)) | |
496 | return NULL; | |
497 | ||
498 | grp->node[0].release = &group_open_release; | |
499 | grp->node[1].release = &group_close_release; | |
500 | INIT_LIST_HEAD(&grp->node[0].entry); | |
501 | INIT_LIST_HEAD(&grp->node[1].entry); | |
502 | set_node_dbginfo(&grp->node[0], "grp<", 0); | |
503 | set_node_dbginfo(&grp->node[1], "grp>", 0); | |
504 | grp->id = grp; | |
505 | if (id) | |
506 | grp->id = id; | |
507 | ||
508 | spin_lock_irqsave(&dev->devres_lock, flags); | |
509 | add_dr(dev, &grp->node[0]); | |
510 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
511 | return grp->id; | |
512 | } | |
513 | EXPORT_SYMBOL_GPL(devres_open_group); | |
514 | ||
515 | /* Find devres group with ID @id. If @id is NULL, look for the latest. */ | |
516 | static struct devres_group * find_group(struct device *dev, void *id) | |
517 | { | |
518 | struct devres_node *node; | |
519 | ||
520 | list_for_each_entry_reverse(node, &dev->devres_head, entry) { | |
521 | struct devres_group *grp; | |
522 | ||
523 | if (node->release != &group_open_release) | |
524 | continue; | |
525 | ||
526 | grp = container_of(node, struct devres_group, node[0]); | |
527 | ||
528 | if (id) { | |
529 | if (grp->id == id) | |
530 | return grp; | |
531 | } else if (list_empty(&grp->node[1].entry)) | |
532 | return grp; | |
533 | } | |
534 | ||
535 | return NULL; | |
536 | } | |
537 | ||
538 | /** | |
539 | * devres_close_group - Close a devres group | |
540 | * @dev: Device to close devres group for | |
541 | * @id: ID of target group, can be NULL | |
542 | * | |
543 | * Close the group identified by @id. If @id is NULL, the latest open | |
544 | * group is selected. | |
545 | */ | |
546 | void devres_close_group(struct device *dev, void *id) | |
547 | { | |
548 | struct devres_group *grp; | |
549 | unsigned long flags; | |
550 | ||
551 | spin_lock_irqsave(&dev->devres_lock, flags); | |
552 | ||
553 | grp = find_group(dev, id); | |
554 | if (grp) | |
555 | add_dr(dev, &grp->node[1]); | |
556 | else | |
557 | WARN_ON(1); | |
558 | ||
559 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
560 | } | |
561 | EXPORT_SYMBOL_GPL(devres_close_group); | |
562 | ||
563 | /** | |
564 | * devres_remove_group - Remove a devres group | |
565 | * @dev: Device to remove group for | |
566 | * @id: ID of target group, can be NULL | |
567 | * | |
568 | * Remove the group identified by @id. If @id is NULL, the latest | |
569 | * open group is selected. Note that removing a group doesn't affect | |
570 | * any other resources. | |
571 | */ | |
572 | void devres_remove_group(struct device *dev, void *id) | |
573 | { | |
574 | struct devres_group *grp; | |
575 | unsigned long flags; | |
576 | ||
577 | spin_lock_irqsave(&dev->devres_lock, flags); | |
578 | ||
579 | grp = find_group(dev, id); | |
580 | if (grp) { | |
581 | list_del_init(&grp->node[0].entry); | |
582 | list_del_init(&grp->node[1].entry); | |
583 | devres_log(dev, &grp->node[0], "REM"); | |
584 | } else | |
585 | WARN_ON(1); | |
586 | ||
587 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
588 | ||
589 | kfree(grp); | |
590 | } | |
591 | EXPORT_SYMBOL_GPL(devres_remove_group); | |
592 | ||
593 | /** | |
594 | * devres_release_group - Release resources in a devres group | |
595 | * @dev: Device to release group for | |
596 | * @id: ID of target group, can be NULL | |
597 | * | |
598 | * Release all resources in the group identified by @id. If @id is | |
599 | * NULL, the latest open group is selected. The selected group and | |
600 | * groups properly nested inside the selected group are removed. | |
601 | * | |
602 | * RETURNS: | |
603 | * The number of released non-group resources. | |
604 | */ | |
605 | int devres_release_group(struct device *dev, void *id) | |
606 | { | |
607 | struct devres_group *grp; | |
608 | unsigned long flags; | |
609 | int cnt = 0; | |
610 | ||
611 | spin_lock_irqsave(&dev->devres_lock, flags); | |
612 | ||
613 | grp = find_group(dev, id); | |
614 | if (grp) { | |
615 | struct list_head *first = &grp->node[0].entry; | |
616 | struct list_head *end = &dev->devres_head; | |
617 | ||
618 | if (!list_empty(&grp->node[1].entry)) | |
619 | end = grp->node[1].entry.next; | |
620 | ||
621 | cnt = release_nodes(dev, first, end, flags); | |
622 | } else { | |
623 | WARN_ON(1); | |
624 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
625 | } | |
626 | ||
627 | return cnt; | |
628 | } | |
629 | EXPORT_SYMBOL_GPL(devres_release_group); | |
630 | ||
631 | /* | |
632 | * Managed kzalloc/kfree | |
633 | */ | |
634 | static void devm_kzalloc_release(struct device *dev, void *res) | |
635 | { | |
636 | /* noop */ | |
637 | } | |
638 | ||
639 | static int devm_kzalloc_match(struct device *dev, void *res, void *data) | |
640 | { | |
641 | return res == data; | |
642 | } | |
643 | ||
644 | /** | |
d3e6975e | 645 | * devm_kzalloc - Resource-managed kzalloc |
9ac7849e TH |
646 | * @dev: Device to allocate memory for |
647 | * @size: Allocation size | |
648 | * @gfp: Allocation gfp flags | |
649 | * | |
650 | * Managed kzalloc. Memory allocated with this function is | |
651 | * automatically freed on driver detach. Like all other devres | |
652 | * resources, guaranteed alignment is unsigned long long. | |
653 | * | |
654 | * RETURNS: | |
655 | * Pointer to allocated memory on success, NULL on failure. | |
656 | */ | |
657 | void * devm_kzalloc(struct device *dev, size_t size, gfp_t gfp) | |
658 | { | |
659 | struct devres *dr; | |
660 | ||
661 | /* use raw alloc_dr for kmalloc caller tracing */ | |
662 | dr = alloc_dr(devm_kzalloc_release, size, gfp); | |
663 | if (unlikely(!dr)) | |
664 | return NULL; | |
665 | ||
666 | set_node_dbginfo(&dr->node, "devm_kzalloc_release", size); | |
667 | devres_add(dev, dr->data); | |
668 | return dr->data; | |
669 | } | |
670 | EXPORT_SYMBOL_GPL(devm_kzalloc); | |
671 | ||
672 | /** | |
d3e6975e | 673 | * devm_kfree - Resource-managed kfree |
9ac7849e TH |
674 | * @dev: Device this memory belongs to |
675 | * @p: Memory to free | |
676 | * | |
92f1b851 | 677 | * Free memory allocated with devm_kzalloc(). |
9ac7849e TH |
678 | */ |
679 | void devm_kfree(struct device *dev, void *p) | |
680 | { | |
681 | int rc; | |
682 | ||
683 | rc = devres_destroy(dev, devm_kzalloc_release, devm_kzalloc_match, p); | |
684 | WARN_ON(rc); | |
685 | } | |
686 | EXPORT_SYMBOL_GPL(devm_kfree); |