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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * kobject.c - library routines for handling generic kernel objects | |
3 | * | |
4 | * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org> | |
f0e7e1bd GKH |
5 | * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com> |
6 | * Copyright (c) 2006-2007 Novell Inc. | |
1da177e4 LT |
7 | * |
8 | * This file is released under the GPLv2. | |
9 | * | |
10 | * | |
11 | * Please see the file Documentation/kobject.txt for critical information | |
12 | * about using the kobject interface. | |
13 | */ | |
14 | ||
15 | #include <linux/kobject.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/stat.h> | |
4e57b681 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | |
21 | /** | |
22 | * populate_dir - populate directory with attributes. | |
23 | * @kobj: object we're working on. | |
24 | * | |
25 | * Most subsystems have a set of default attributes that | |
26 | * are associated with an object that registers with them. | |
27 | * This is a helper called during object registration that | |
28 | * loops through the default attributes of the subsystem | |
29 | * and creates attributes files for them in sysfs. | |
30 | * | |
31 | */ | |
32 | ||
33 | static int populate_dir(struct kobject * kobj) | |
34 | { | |
35 | struct kobj_type * t = get_ktype(kobj); | |
36 | struct attribute * attr; | |
37 | int error = 0; | |
38 | int i; | |
39 | ||
40 | if (t && t->default_attrs) { | |
41 | for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { | |
42 | if ((error = sysfs_create_file(kobj,attr))) | |
43 | break; | |
44 | } | |
45 | } | |
46 | return error; | |
47 | } | |
48 | ||
90bc6135 | 49 | static int create_dir(struct kobject * kobj) |
1da177e4 LT |
50 | { |
51 | int error = 0; | |
52 | if (kobject_name(kobj)) { | |
90bc6135 | 53 | error = sysfs_create_dir(kobj); |
1da177e4 LT |
54 | if (!error) { |
55 | if ((error = populate_dir(kobj))) | |
56 | sysfs_remove_dir(kobj); | |
57 | } | |
58 | } | |
59 | return error; | |
60 | } | |
61 | ||
62 | static inline struct kobject * to_kobj(struct list_head * entry) | |
63 | { | |
64 | return container_of(entry,struct kobject,entry); | |
65 | } | |
66 | ||
67 | static int get_kobj_path_length(struct kobject *kobj) | |
68 | { | |
69 | int length = 1; | |
70 | struct kobject * parent = kobj; | |
71 | ||
72 | /* walk up the ancestors until we hit the one pointing to the | |
73 | * root. | |
74 | * Add 1 to strlen for leading '/' of each level. | |
75 | */ | |
76 | do { | |
b365b3da CE |
77 | if (kobject_name(parent) == NULL) |
78 | return 0; | |
1da177e4 LT |
79 | length += strlen(kobject_name(parent)) + 1; |
80 | parent = parent->parent; | |
81 | } while (parent); | |
82 | return length; | |
83 | } | |
84 | ||
85 | static void fill_kobj_path(struct kobject *kobj, char *path, int length) | |
86 | { | |
87 | struct kobject * parent; | |
88 | ||
89 | --length; | |
90 | for (parent = kobj; parent; parent = parent->parent) { | |
91 | int cur = strlen(kobject_name(parent)); | |
92 | /* back up enough to print this name with '/' */ | |
93 | length -= cur; | |
94 | strncpy (path + length, kobject_name(parent), cur); | |
95 | *(path + --length) = '/'; | |
96 | } | |
97 | ||
98 | pr_debug("%s: path = '%s'\n",__FUNCTION__,path); | |
99 | } | |
100 | ||
101 | /** | |
72fd4a35 | 102 | * kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
1da177e4 LT |
103 | * |
104 | * @kobj: kobject in question, with which to build the path | |
105 | * @gfp_mask: the allocation type used to allocate the path | |
72fd4a35 RD |
106 | * |
107 | * The result must be freed by the caller with kfree(). | |
1da177e4 | 108 | */ |
fd4f2df2 | 109 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
110 | { |
111 | char *path; | |
112 | int len; | |
113 | ||
114 | len = get_kobj_path_length(kobj); | |
b365b3da CE |
115 | if (len == 0) |
116 | return NULL; | |
4668edc3 | 117 | path = kzalloc(len, gfp_mask); |
1da177e4 LT |
118 | if (!path) |
119 | return NULL; | |
1da177e4 LT |
120 | fill_kobj_path(kobj, path, len); |
121 | ||
122 | return path; | |
123 | } | |
80fc9f53 | 124 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 LT |
125 | |
126 | /** | |
127 | * kobject_init - initialize object. | |
128 | * @kobj: object in question. | |
129 | */ | |
130 | void kobject_init(struct kobject * kobj) | |
131 | { | |
31b9025a GKH |
132 | if (!kobj) |
133 | return; | |
1da177e4 LT |
134 | kref_init(&kobj->kref); |
135 | INIT_LIST_HEAD(&kobj->entry); | |
136 | kobj->kset = kset_get(kobj->kset); | |
137 | } | |
138 | ||
139 | ||
140 | /** | |
141 | * unlink - remove kobject from kset list. | |
142 | * @kobj: kobject. | |
143 | * | |
144 | * Remove the kobject from the kset list and decrement | |
145 | * its parent's refcount. | |
146 | * This is separated out, so we can use it in both | |
147 | * kobject_del() and kobject_add() on error. | |
148 | */ | |
149 | ||
150 | static void unlink(struct kobject * kobj) | |
151 | { | |
152 | if (kobj->kset) { | |
153 | spin_lock(&kobj->kset->list_lock); | |
154 | list_del_init(&kobj->entry); | |
155 | spin_unlock(&kobj->kset->list_lock); | |
156 | } | |
157 | kobject_put(kobj); | |
158 | } | |
159 | ||
160 | /** | |
90bc6135 | 161 | * kobject_add - add an object to the hierarchy. |
1da177e4 LT |
162 | * @kobj: object. |
163 | */ | |
164 | ||
90bc6135 | 165 | int kobject_add(struct kobject * kobj) |
1da177e4 LT |
166 | { |
167 | int error = 0; | |
168 | struct kobject * parent; | |
169 | ||
170 | if (!(kobj = kobject_get(kobj))) | |
171 | return -ENOENT; | |
172 | if (!kobj->k_name) | |
ce2c9cb0 | 173 | kobject_set_name(kobj, "NO_NAME"); |
13507701 | 174 | if (!*kobj->k_name) { |
c171fef5 GKH |
175 | pr_debug("kobject attempted to be registered with no name!\n"); |
176 | WARN_ON(1); | |
88db4721 | 177 | kobject_put(kobj); |
c171fef5 GKH |
178 | return -EINVAL; |
179 | } | |
1da177e4 LT |
180 | parent = kobject_get(kobj->parent); |
181 | ||
182 | pr_debug("kobject %s: registering. parent: %s, set: %s\n", | |
183 | kobject_name(kobj), parent ? kobject_name(parent) : "<NULL>", | |
ce2c9cb0 | 184 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>" ); |
1da177e4 LT |
185 | |
186 | if (kobj->kset) { | |
187 | spin_lock(&kobj->kset->list_lock); | |
188 | ||
189 | if (!parent) | |
190 | parent = kobject_get(&kobj->kset->kobj); | |
191 | ||
192 | list_add_tail(&kobj->entry,&kobj->kset->list); | |
193 | spin_unlock(&kobj->kset->list_lock); | |
460f7e9a | 194 | kobj->parent = parent; |
1da177e4 | 195 | } |
1da177e4 | 196 | |
90bc6135 | 197 | error = create_dir(kobj); |
1da177e4 LT |
198 | if (error) { |
199 | /* unlink does the kobject_put() for us */ | |
200 | unlink(kobj); | |
b067db49 | 201 | kobject_put(parent); |
dcd0da00 GKH |
202 | |
203 | /* be noisy on error issues */ | |
204 | if (error == -EEXIST) | |
5c73a3fb GKH |
205 | printk(KERN_ERR "kobject_add failed for %s with " |
206 | "-EEXIST, don't try to register things with " | |
207 | "the same name in the same directory.\n", | |
dcd0da00 GKH |
208 | kobject_name(kobj)); |
209 | else | |
5c73a3fb | 210 | printk(KERN_ERR "kobject_add failed for %s (%d)\n", |
dcd0da00 | 211 | kobject_name(kobj), error); |
5c73a3fb | 212 | dump_stack(); |
1da177e4 LT |
213 | } |
214 | ||
215 | return error; | |
216 | } | |
217 | ||
1da177e4 LT |
218 | /** |
219 | * kobject_register - initialize and add an object. | |
220 | * @kobj: object in question. | |
221 | */ | |
222 | ||
223 | int kobject_register(struct kobject * kobj) | |
224 | { | |
dcd0da00 | 225 | int error = -EINVAL; |
1da177e4 LT |
226 | if (kobj) { |
227 | kobject_init(kobj); | |
228 | error = kobject_add(kobj); | |
dcd0da00 | 229 | if (!error) |
312c004d | 230 | kobject_uevent(kobj, KOBJ_ADD); |
dcd0da00 | 231 | } |
1da177e4 LT |
232 | return error; |
233 | } | |
234 | ||
235 | ||
236 | /** | |
8c4606b1 GKH |
237 | * kobject_set_name - Set the name of a kobject |
238 | * @kobj: kobject to name | |
239 | * @fmt: format string used to build the name | |
1da177e4 | 240 | * |
8c4606b1 GKH |
241 | * This sets the name of the kobject. If you have already added the |
242 | * kobject to the system, you must call kobject_rename() in order to | |
243 | * change the name of the kobject. | |
1da177e4 | 244 | */ |
1da177e4 LT |
245 | int kobject_set_name(struct kobject * kobj, const char * fmt, ...) |
246 | { | |
247 | int error = 0; | |
ce2c9cb0 | 248 | int limit; |
1da177e4 LT |
249 | int need; |
250 | va_list args; | |
ce2c9cb0 | 251 | char *name; |
1da177e4 | 252 | |
ce2c9cb0 GKH |
253 | /* find out how big a buffer we need */ |
254 | name = kmalloc(1024, GFP_KERNEL); | |
255 | if (!name) { | |
256 | error = -ENOMEM; | |
257 | goto done; | |
258 | } | |
259 | va_start(args, fmt); | |
260 | need = vsnprintf(name, 1024, fmt, args); | |
1da177e4 | 261 | va_end(args); |
ce2c9cb0 GKH |
262 | kfree(name); |
263 | ||
264 | /* Allocate the new space and copy the string in */ | |
265 | limit = need + 1; | |
266 | name = kmalloc(limit, GFP_KERNEL); | |
267 | if (!name) { | |
268 | error = -ENOMEM; | |
269 | goto done; | |
270 | } | |
271 | va_start(args, fmt); | |
272 | need = vsnprintf(name, limit, fmt, args); | |
273 | va_end(args); | |
274 | ||
275 | /* something wrong with the string we copied? */ | |
276 | if (need >= limit) { | |
277 | kfree(name); | |
278 | error = -EFAULT; | |
279 | goto done; | |
1da177e4 LT |
280 | } |
281 | ||
282 | /* Free the old name, if necessary. */ | |
ce2c9cb0 | 283 | kfree(kobj->k_name); |
1da177e4 LT |
284 | |
285 | /* Now, set the new name */ | |
286 | kobj->k_name = name; | |
ce2c9cb0 | 287 | done: |
1da177e4 LT |
288 | return error; |
289 | } | |
1da177e4 LT |
290 | EXPORT_SYMBOL(kobject_set_name); |
291 | ||
1da177e4 LT |
292 | /** |
293 | * kobject_rename - change the name of an object | |
294 | * @kobj: object in question. | |
295 | * @new_name: object's new name | |
296 | */ | |
297 | ||
f3b4f3c6 | 298 | int kobject_rename(struct kobject * kobj, const char *new_name) |
1da177e4 LT |
299 | { |
300 | int error = 0; | |
ca2f37db JT |
301 | const char *devpath = NULL; |
302 | char *devpath_string = NULL; | |
303 | char *envp[2]; | |
1da177e4 LT |
304 | |
305 | kobj = kobject_get(kobj); | |
306 | if (!kobj) | |
307 | return -EINVAL; | |
b592fcfe EB |
308 | if (!kobj->parent) |
309 | return -EINVAL; | |
ca2f37db | 310 | |
34358c26 GKH |
311 | /* see if this name is already in use */ |
312 | if (kobj->kset) { | |
313 | struct kobject *temp_kobj; | |
314 | temp_kobj = kset_find_obj(kobj->kset, new_name); | |
315 | if (temp_kobj) { | |
71409a49 JB |
316 | printk(KERN_WARNING "kobject '%s' cannot be renamed " |
317 | "to '%s' as '%s' is already in existence.\n", | |
34358c26 GKH |
318 | kobject_name(kobj), new_name, new_name); |
319 | kobject_put(temp_kobj); | |
320 | return -EINVAL; | |
321 | } | |
322 | } | |
323 | ||
ca2f37db JT |
324 | devpath = kobject_get_path(kobj, GFP_KERNEL); |
325 | if (!devpath) { | |
326 | error = -ENOMEM; | |
327 | goto out; | |
328 | } | |
329 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
330 | if (!devpath_string) { | |
331 | error = -ENOMEM; | |
332 | goto out; | |
333 | } | |
334 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
335 | envp[0] = devpath_string; | |
336 | envp[1] = NULL; | |
ca2f37db | 337 | |
90bc6135 | 338 | error = sysfs_rename_dir(kobj, new_name); |
ca2f37db JT |
339 | |
340 | /* This function is mostly/only used for network interface. | |
341 | * Some hotplug package track interfaces by their name and | |
342 | * therefore want to know when the name is changed by the user. */ | |
343 | if (!error) | |
344 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
345 | ||
346 | out: | |
347 | kfree(devpath_string); | |
348 | kfree(devpath); | |
b592fcfe EB |
349 | kobject_put(kobj); |
350 | ||
351 | return error; | |
352 | } | |
353 | ||
8a82472f CH |
354 | /** |
355 | * kobject_move - move object to another parent | |
356 | * @kobj: object in question. | |
c744aeae | 357 | * @new_parent: object's new parent (can be NULL) |
8a82472f CH |
358 | */ |
359 | ||
360 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) | |
361 | { | |
362 | int error; | |
363 | struct kobject *old_parent; | |
364 | const char *devpath = NULL; | |
365 | char *devpath_string = NULL; | |
366 | char *envp[2]; | |
367 | ||
368 | kobj = kobject_get(kobj); | |
369 | if (!kobj) | |
370 | return -EINVAL; | |
371 | new_parent = kobject_get(new_parent); | |
372 | if (!new_parent) { | |
c744aeae CH |
373 | if (kobj->kset) |
374 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f CH |
375 | } |
376 | /* old object path */ | |
377 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
378 | if (!devpath) { | |
379 | error = -ENOMEM; | |
380 | goto out; | |
381 | } | |
382 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
383 | if (!devpath_string) { | |
384 | error = -ENOMEM; | |
385 | goto out; | |
386 | } | |
387 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
388 | envp[0] = devpath_string; | |
389 | envp[1] = NULL; | |
390 | error = sysfs_move_dir(kobj, new_parent); | |
391 | if (error) | |
392 | goto out; | |
393 | old_parent = kobj->parent; | |
394 | kobj->parent = new_parent; | |
9e993efb | 395 | new_parent = NULL; |
8a82472f CH |
396 | kobject_put(old_parent); |
397 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
398 | out: | |
9e993efb | 399 | kobject_put(new_parent); |
8a82472f CH |
400 | kobject_put(kobj); |
401 | kfree(devpath_string); | |
402 | kfree(devpath); | |
403 | return error; | |
404 | } | |
405 | ||
1da177e4 LT |
406 | /** |
407 | * kobject_del - unlink kobject from hierarchy. | |
408 | * @kobj: object. | |
409 | */ | |
410 | ||
411 | void kobject_del(struct kobject * kobj) | |
412 | { | |
31b9025a GKH |
413 | if (!kobj) |
414 | return; | |
1da177e4 LT |
415 | sysfs_remove_dir(kobj); |
416 | unlink(kobj); | |
417 | } | |
418 | ||
419 | /** | |
420 | * kobject_unregister - remove object from hierarchy and decrement refcount. | |
421 | * @kobj: object going away. | |
422 | */ | |
423 | ||
424 | void kobject_unregister(struct kobject * kobj) | |
425 | { | |
31b9025a GKH |
426 | if (!kobj) |
427 | return; | |
1da177e4 | 428 | pr_debug("kobject %s: unregistering\n",kobject_name(kobj)); |
312c004d | 429 | kobject_uevent(kobj, KOBJ_REMOVE); |
1da177e4 LT |
430 | kobject_del(kobj); |
431 | kobject_put(kobj); | |
432 | } | |
433 | ||
434 | /** | |
435 | * kobject_get - increment refcount for object. | |
436 | * @kobj: object. | |
437 | */ | |
438 | ||
439 | struct kobject * kobject_get(struct kobject * kobj) | |
440 | { | |
441 | if (kobj) | |
442 | kref_get(&kobj->kref); | |
443 | return kobj; | |
444 | } | |
445 | ||
446 | /** | |
447 | * kobject_cleanup - free kobject resources. | |
448 | * @kobj: object. | |
449 | */ | |
450 | ||
451 | void kobject_cleanup(struct kobject * kobj) | |
452 | { | |
453 | struct kobj_type * t = get_ktype(kobj); | |
454 | struct kset * s = kobj->kset; | |
455 | struct kobject * parent = kobj->parent; | |
ce2c9cb0 | 456 | const char *name = kobj->k_name; |
1da177e4 LT |
457 | |
458 | pr_debug("kobject %s: cleaning up\n",kobject_name(kobj)); | |
ce2c9cb0 | 459 | if (t && t->release) { |
1da177e4 | 460 | t->release(kobj); |
ce2c9cb0 GKH |
461 | /* If we have a release function, we can guess that this was |
462 | * not a statically allocated kobject, so we should be safe to | |
463 | * free the name */ | |
464 | kfree(name); | |
465 | } | |
1da177e4 LT |
466 | if (s) |
467 | kset_put(s); | |
b067db49 | 468 | kobject_put(parent); |
1da177e4 LT |
469 | } |
470 | ||
471 | static void kobject_release(struct kref *kref) | |
472 | { | |
473 | kobject_cleanup(container_of(kref, struct kobject, kref)); | |
474 | } | |
475 | ||
476 | /** | |
477 | * kobject_put - decrement refcount for object. | |
478 | * @kobj: object. | |
479 | * | |
480 | * Decrement the refcount, and if 0, call kobject_cleanup(). | |
481 | */ | |
482 | void kobject_put(struct kobject * kobj) | |
483 | { | |
484 | if (kobj) | |
485 | kref_put(&kobj->kref, kobject_release); | |
486 | } | |
487 | ||
488 | ||
7423172a JN |
489 | static void dir_release(struct kobject *kobj) |
490 | { | |
491 | kfree(kobj); | |
492 | } | |
493 | ||
494 | static struct kobj_type dir_ktype = { | |
495 | .release = dir_release, | |
496 | .sysfs_ops = NULL, | |
497 | .default_attrs = NULL, | |
498 | }; | |
499 | ||
500 | /** | |
2753133e | 501 | * kobject_kset_add_dir - add sub directory of object. |
86406245 | 502 | * @kset: kset the directory is belongs to. |
7423172a JN |
503 | * @parent: object in which a directory is created. |
504 | * @name: directory name. | |
505 | * | |
506 | * Add a plain directory object as child of given object. | |
507 | */ | |
86406245 KS |
508 | struct kobject *kobject_kset_add_dir(struct kset *kset, |
509 | struct kobject *parent, const char *name) | |
7423172a JN |
510 | { |
511 | struct kobject *k; | |
10188012 | 512 | int ret; |
7423172a JN |
513 | |
514 | if (!parent) | |
515 | return NULL; | |
516 | ||
517 | k = kzalloc(sizeof(*k), GFP_KERNEL); | |
518 | if (!k) | |
519 | return NULL; | |
520 | ||
86406245 | 521 | k->kset = kset; |
7423172a JN |
522 | k->parent = parent; |
523 | k->ktype = &dir_ktype; | |
524 | kobject_set_name(k, name); | |
10188012 RD |
525 | ret = kobject_register(k); |
526 | if (ret < 0) { | |
2753133e EB |
527 | printk(KERN_WARNING "%s: kobject_register error: %d\n", |
528 | __func__, ret); | |
10188012 RD |
529 | kobject_del(k); |
530 | return NULL; | |
531 | } | |
7423172a JN |
532 | |
533 | return k; | |
534 | } | |
7423172a | 535 | |
2753133e EB |
536 | /** |
537 | * kobject_add_dir - add sub directory of object. | |
538 | * @parent: object in which a directory is created. | |
539 | * @name: directory name. | |
540 | * | |
541 | * Add a plain directory object as child of given object. | |
542 | */ | |
86406245 KS |
543 | struct kobject *kobject_add_dir(struct kobject *parent, const char *name) |
544 | { | |
545 | return kobject_kset_add_dir(NULL, parent, name); | |
546 | } | |
547 | ||
1da177e4 LT |
548 | /** |
549 | * kset_init - initialize a kset for use | |
550 | * @k: kset | |
551 | */ | |
552 | ||
553 | void kset_init(struct kset * k) | |
554 | { | |
555 | kobject_init(&k->kobj); | |
556 | INIT_LIST_HEAD(&k->list); | |
557 | spin_lock_init(&k->list_lock); | |
558 | } | |
559 | ||
560 | ||
561 | /** | |
562 | * kset_add - add a kset object to the hierarchy. | |
563 | * @k: kset. | |
1da177e4 LT |
564 | */ |
565 | ||
566 | int kset_add(struct kset * k) | |
567 | { | |
1da177e4 LT |
568 | return kobject_add(&k->kobj); |
569 | } | |
570 | ||
571 | ||
572 | /** | |
573 | * kset_register - initialize and add a kset. | |
574 | * @k: kset. | |
575 | */ | |
576 | ||
577 | int kset_register(struct kset * k) | |
578 | { | |
80f03e34 KS |
579 | int err; |
580 | ||
31b9025a GKH |
581 | if (!k) |
582 | return -EINVAL; | |
80f03e34 | 583 | |
1da177e4 | 584 | kset_init(k); |
80f03e34 KS |
585 | err = kset_add(k); |
586 | if (err) | |
587 | return err; | |
588 | kobject_uevent(&k->kobj, KOBJ_ADD); | |
589 | return 0; | |
1da177e4 LT |
590 | } |
591 | ||
592 | ||
593 | /** | |
594 | * kset_unregister - remove a kset. | |
595 | * @k: kset. | |
596 | */ | |
597 | ||
598 | void kset_unregister(struct kset * k) | |
599 | { | |
31b9025a GKH |
600 | if (!k) |
601 | return; | |
1da177e4 LT |
602 | kobject_unregister(&k->kobj); |
603 | } | |
604 | ||
605 | ||
606 | /** | |
607 | * kset_find_obj - search for object in kset. | |
608 | * @kset: kset we're looking in. | |
609 | * @name: object's name. | |
610 | * | |
611 | * Lock kset via @kset->subsys, and iterate over @kset->list, | |
612 | * looking for a matching kobject. If matching object is found | |
613 | * take a reference and return the object. | |
614 | */ | |
615 | ||
616 | struct kobject * kset_find_obj(struct kset * kset, const char * name) | |
617 | { | |
618 | struct list_head * entry; | |
619 | struct kobject * ret = NULL; | |
620 | ||
621 | spin_lock(&kset->list_lock); | |
622 | list_for_each(entry,&kset->list) { | |
623 | struct kobject * k = to_kobj(entry); | |
624 | if (kobject_name(k) && !strcmp(kobject_name(k),name)) { | |
625 | ret = kobject_get(k); | |
626 | break; | |
627 | } | |
628 | } | |
629 | spin_unlock(&kset->list_lock); | |
630 | return ret; | |
631 | } | |
632 | ||
823bccfc | 633 | int subsystem_register(struct kset *s) |
1da177e4 | 634 | { |
823bccfc | 635 | return kset_register(s); |
1da177e4 LT |
636 | } |
637 | ||
823bccfc | 638 | void subsystem_unregister(struct kset *s) |
1da177e4 | 639 | { |
823bccfc | 640 | kset_unregister(s); |
1da177e4 LT |
641 | } |
642 | ||
1da177e4 LT |
643 | /** |
644 | * subsystem_create_file - export sysfs attribute file. | |
645 | * @s: subsystem. | |
646 | * @a: subsystem attribute descriptor. | |
647 | */ | |
648 | ||
823bccfc | 649 | int subsys_create_file(struct kset *s, struct subsys_attribute *a) |
1da177e4 LT |
650 | { |
651 | int error = 0; | |
31b9025a GKH |
652 | |
653 | if (!s || !a) | |
654 | return -EINVAL; | |
655 | ||
1ef4cfac | 656 | if (kset_get(s)) { |
823bccfc | 657 | error = sysfs_create_file(&s->kobj, &a->attr); |
6e9d930d | 658 | kset_put(s); |
1da177e4 LT |
659 | } |
660 | return error; | |
661 | } | |
662 | ||
1da177e4 LT |
663 | EXPORT_SYMBOL(kobject_init); |
664 | EXPORT_SYMBOL(kobject_register); | |
665 | EXPORT_SYMBOL(kobject_unregister); | |
666 | EXPORT_SYMBOL(kobject_get); | |
667 | EXPORT_SYMBOL(kobject_put); | |
668 | EXPORT_SYMBOL(kobject_add); | |
669 | EXPORT_SYMBOL(kobject_del); | |
670 | ||
671 | EXPORT_SYMBOL(kset_register); | |
672 | EXPORT_SYMBOL(kset_unregister); | |
1da177e4 | 673 | |
1da177e4 LT |
674 | EXPORT_SYMBOL(subsystem_register); |
675 | EXPORT_SYMBOL(subsystem_unregister); | |
676 | EXPORT_SYMBOL(subsys_create_file); |