Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * kobject.c - library routines for handling generic kernel objects | |
3 | * | |
4 | * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org> | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | * | |
8 | * | |
9 | * Please see the file Documentation/kobject.txt for critical information | |
10 | * about using the kobject interface. | |
11 | */ | |
12 | ||
13 | #include <linux/kobject.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/stat.h> | |
4e57b681 | 17 | #include <linux/slab.h> |
1da177e4 LT |
18 | |
19 | /** | |
20 | * populate_dir - populate directory with attributes. | |
21 | * @kobj: object we're working on. | |
22 | * | |
23 | * Most subsystems have a set of default attributes that | |
24 | * are associated with an object that registers with them. | |
25 | * This is a helper called during object registration that | |
26 | * loops through the default attributes of the subsystem | |
27 | * and creates attributes files for them in sysfs. | |
28 | * | |
29 | */ | |
30 | ||
31 | static int populate_dir(struct kobject * kobj) | |
32 | { | |
33 | struct kobj_type * t = get_ktype(kobj); | |
34 | struct attribute * attr; | |
35 | int error = 0; | |
36 | int i; | |
37 | ||
38 | if (t && t->default_attrs) { | |
39 | for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { | |
40 | if ((error = sysfs_create_file(kobj,attr))) | |
41 | break; | |
42 | } | |
43 | } | |
44 | return error; | |
45 | } | |
46 | ||
90bc6135 | 47 | static int create_dir(struct kobject * kobj) |
1da177e4 LT |
48 | { |
49 | int error = 0; | |
50 | if (kobject_name(kobj)) { | |
90bc6135 | 51 | error = sysfs_create_dir(kobj); |
1da177e4 LT |
52 | if (!error) { |
53 | if ((error = populate_dir(kobj))) | |
54 | sysfs_remove_dir(kobj); | |
55 | } | |
56 | } | |
57 | return error; | |
58 | } | |
59 | ||
60 | static inline struct kobject * to_kobj(struct list_head * entry) | |
61 | { | |
62 | return container_of(entry,struct kobject,entry); | |
63 | } | |
64 | ||
65 | static int get_kobj_path_length(struct kobject *kobj) | |
66 | { | |
67 | int length = 1; | |
68 | struct kobject * parent = kobj; | |
69 | ||
70 | /* walk up the ancestors until we hit the one pointing to the | |
71 | * root. | |
72 | * Add 1 to strlen for leading '/' of each level. | |
73 | */ | |
74 | do { | |
b365b3da CE |
75 | if (kobject_name(parent) == NULL) |
76 | return 0; | |
1da177e4 LT |
77 | length += strlen(kobject_name(parent)) + 1; |
78 | parent = parent->parent; | |
79 | } while (parent); | |
80 | return length; | |
81 | } | |
82 | ||
83 | static void fill_kobj_path(struct kobject *kobj, char *path, int length) | |
84 | { | |
85 | struct kobject * parent; | |
86 | ||
87 | --length; | |
88 | for (parent = kobj; parent; parent = parent->parent) { | |
89 | int cur = strlen(kobject_name(parent)); | |
90 | /* back up enough to print this name with '/' */ | |
91 | length -= cur; | |
92 | strncpy (path + length, kobject_name(parent), cur); | |
93 | *(path + --length) = '/'; | |
94 | } | |
95 | ||
96 | pr_debug("%s: path = '%s'\n",__FUNCTION__,path); | |
97 | } | |
98 | ||
99 | /** | |
72fd4a35 | 100 | * kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
1da177e4 LT |
101 | * |
102 | * @kobj: kobject in question, with which to build the path | |
103 | * @gfp_mask: the allocation type used to allocate the path | |
72fd4a35 RD |
104 | * |
105 | * The result must be freed by the caller with kfree(). | |
1da177e4 | 106 | */ |
fd4f2df2 | 107 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
108 | { |
109 | char *path; | |
110 | int len; | |
111 | ||
112 | len = get_kobj_path_length(kobj); | |
b365b3da CE |
113 | if (len == 0) |
114 | return NULL; | |
4668edc3 | 115 | path = kzalloc(len, gfp_mask); |
1da177e4 LT |
116 | if (!path) |
117 | return NULL; | |
1da177e4 LT |
118 | fill_kobj_path(kobj, path, len); |
119 | ||
120 | return path; | |
121 | } | |
80fc9f53 | 122 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 LT |
123 | |
124 | /** | |
125 | * kobject_init - initialize object. | |
126 | * @kobj: object in question. | |
127 | */ | |
128 | void kobject_init(struct kobject * kobj) | |
129 | { | |
31b9025a GKH |
130 | if (!kobj) |
131 | return; | |
1da177e4 LT |
132 | kref_init(&kobj->kref); |
133 | INIT_LIST_HEAD(&kobj->entry); | |
134 | kobj->kset = kset_get(kobj->kset); | |
135 | } | |
136 | ||
137 | ||
138 | /** | |
139 | * unlink - remove kobject from kset list. | |
140 | * @kobj: kobject. | |
141 | * | |
142 | * Remove the kobject from the kset list and decrement | |
143 | * its parent's refcount. | |
144 | * This is separated out, so we can use it in both | |
145 | * kobject_del() and kobject_add() on error. | |
146 | */ | |
147 | ||
148 | static void unlink(struct kobject * kobj) | |
149 | { | |
150 | if (kobj->kset) { | |
151 | spin_lock(&kobj->kset->list_lock); | |
152 | list_del_init(&kobj->entry); | |
153 | spin_unlock(&kobj->kset->list_lock); | |
154 | } | |
155 | kobject_put(kobj); | |
156 | } | |
157 | ||
158 | /** | |
90bc6135 | 159 | * kobject_add - add an object to the hierarchy. |
1da177e4 LT |
160 | * @kobj: object. |
161 | */ | |
162 | ||
90bc6135 | 163 | int kobject_add(struct kobject * kobj) |
1da177e4 LT |
164 | { |
165 | int error = 0; | |
166 | struct kobject * parent; | |
167 | ||
168 | if (!(kobj = kobject_get(kobj))) | |
169 | return -ENOENT; | |
170 | if (!kobj->k_name) | |
ce2c9cb0 | 171 | kobject_set_name(kobj, "NO_NAME"); |
13507701 | 172 | if (!*kobj->k_name) { |
c171fef5 GKH |
173 | pr_debug("kobject attempted to be registered with no name!\n"); |
174 | WARN_ON(1); | |
88db4721 | 175 | kobject_put(kobj); |
c171fef5 GKH |
176 | return -EINVAL; |
177 | } | |
1da177e4 LT |
178 | parent = kobject_get(kobj->parent); |
179 | ||
180 | pr_debug("kobject %s: registering. parent: %s, set: %s\n", | |
181 | kobject_name(kobj), parent ? kobject_name(parent) : "<NULL>", | |
ce2c9cb0 | 182 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>" ); |
1da177e4 LT |
183 | |
184 | if (kobj->kset) { | |
185 | spin_lock(&kobj->kset->list_lock); | |
186 | ||
187 | if (!parent) | |
188 | parent = kobject_get(&kobj->kset->kobj); | |
189 | ||
190 | list_add_tail(&kobj->entry,&kobj->kset->list); | |
191 | spin_unlock(&kobj->kset->list_lock); | |
460f7e9a | 192 | kobj->parent = parent; |
1da177e4 | 193 | } |
1da177e4 | 194 | |
90bc6135 | 195 | error = create_dir(kobj); |
1da177e4 LT |
196 | if (error) { |
197 | /* unlink does the kobject_put() for us */ | |
198 | unlink(kobj); | |
b067db49 | 199 | kobject_put(parent); |
dcd0da00 GKH |
200 | |
201 | /* be noisy on error issues */ | |
202 | if (error == -EEXIST) | |
5c73a3fb GKH |
203 | printk(KERN_ERR "kobject_add failed for %s with " |
204 | "-EEXIST, don't try to register things with " | |
205 | "the same name in the same directory.\n", | |
dcd0da00 GKH |
206 | kobject_name(kobj)); |
207 | else | |
5c73a3fb | 208 | printk(KERN_ERR "kobject_add failed for %s (%d)\n", |
dcd0da00 | 209 | kobject_name(kobj), error); |
5c73a3fb | 210 | dump_stack(); |
1da177e4 LT |
211 | } |
212 | ||
213 | return error; | |
214 | } | |
215 | ||
1da177e4 LT |
216 | /** |
217 | * kobject_register - initialize and add an object. | |
218 | * @kobj: object in question. | |
219 | */ | |
220 | ||
221 | int kobject_register(struct kobject * kobj) | |
222 | { | |
dcd0da00 | 223 | int error = -EINVAL; |
1da177e4 LT |
224 | if (kobj) { |
225 | kobject_init(kobj); | |
226 | error = kobject_add(kobj); | |
dcd0da00 | 227 | if (!error) |
312c004d | 228 | kobject_uevent(kobj, KOBJ_ADD); |
dcd0da00 | 229 | } |
1da177e4 LT |
230 | return error; |
231 | } | |
232 | ||
233 | ||
234 | /** | |
235 | * kobject_set_name - Set the name of an object | |
236 | * @kobj: object. | |
67be2dd1 | 237 | * @fmt: format string used to build the name |
1da177e4 LT |
238 | * |
239 | * If strlen(name) >= KOBJ_NAME_LEN, then use a dynamically allocated | |
240 | * string that @kobj->k_name points to. Otherwise, use the static | |
241 | * @kobj->name array. | |
242 | */ | |
1da177e4 LT |
243 | int kobject_set_name(struct kobject * kobj, const char * fmt, ...) |
244 | { | |
245 | int error = 0; | |
ce2c9cb0 | 246 | int limit; |
1da177e4 LT |
247 | int need; |
248 | va_list args; | |
ce2c9cb0 | 249 | char *name; |
1da177e4 | 250 | |
ce2c9cb0 GKH |
251 | /* find out how big a buffer we need */ |
252 | name = kmalloc(1024, GFP_KERNEL); | |
253 | if (!name) { | |
254 | error = -ENOMEM; | |
255 | goto done; | |
256 | } | |
257 | va_start(args, fmt); | |
258 | need = vsnprintf(name, 1024, fmt, args); | |
1da177e4 | 259 | va_end(args); |
ce2c9cb0 GKH |
260 | kfree(name); |
261 | ||
262 | /* Allocate the new space and copy the string in */ | |
263 | limit = need + 1; | |
264 | name = kmalloc(limit, GFP_KERNEL); | |
265 | if (!name) { | |
266 | error = -ENOMEM; | |
267 | goto done; | |
268 | } | |
269 | va_start(args, fmt); | |
270 | need = vsnprintf(name, limit, fmt, args); | |
271 | va_end(args); | |
272 | ||
273 | /* something wrong with the string we copied? */ | |
274 | if (need >= limit) { | |
275 | kfree(name); | |
276 | error = -EFAULT; | |
277 | goto done; | |
1da177e4 LT |
278 | } |
279 | ||
280 | /* Free the old name, if necessary. */ | |
ce2c9cb0 | 281 | kfree(kobj->k_name); |
1da177e4 LT |
282 | |
283 | /* Now, set the new name */ | |
284 | kobj->k_name = name; | |
ce2c9cb0 | 285 | done: |
1da177e4 LT |
286 | return error; |
287 | } | |
1da177e4 LT |
288 | EXPORT_SYMBOL(kobject_set_name); |
289 | ||
1da177e4 LT |
290 | /** |
291 | * kobject_rename - change the name of an object | |
292 | * @kobj: object in question. | |
293 | * @new_name: object's new name | |
294 | */ | |
295 | ||
f3b4f3c6 | 296 | int kobject_rename(struct kobject * kobj, const char *new_name) |
1da177e4 LT |
297 | { |
298 | int error = 0; | |
ca2f37db JT |
299 | const char *devpath = NULL; |
300 | char *devpath_string = NULL; | |
301 | char *envp[2]; | |
1da177e4 LT |
302 | |
303 | kobj = kobject_get(kobj); | |
304 | if (!kobj) | |
305 | return -EINVAL; | |
b592fcfe EB |
306 | if (!kobj->parent) |
307 | return -EINVAL; | |
ca2f37db JT |
308 | |
309 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
310 | if (!devpath) { | |
311 | error = -ENOMEM; | |
312 | goto out; | |
313 | } | |
314 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
315 | if (!devpath_string) { | |
316 | error = -ENOMEM; | |
317 | goto out; | |
318 | } | |
319 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
320 | envp[0] = devpath_string; | |
321 | envp[1] = NULL; | |
322 | /* Note : if we want to send the new name alone, not the full path, | |
323 | * we could probably use kobject_name(kobj); */ | |
324 | ||
90bc6135 | 325 | error = sysfs_rename_dir(kobj, new_name); |
ca2f37db JT |
326 | |
327 | /* This function is mostly/only used for network interface. | |
328 | * Some hotplug package track interfaces by their name and | |
329 | * therefore want to know when the name is changed by the user. */ | |
330 | if (!error) | |
331 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
332 | ||
333 | out: | |
334 | kfree(devpath_string); | |
335 | kfree(devpath); | |
b592fcfe EB |
336 | kobject_put(kobj); |
337 | ||
338 | return error; | |
339 | } | |
340 | ||
8a82472f CH |
341 | /** |
342 | * kobject_move - move object to another parent | |
343 | * @kobj: object in question. | |
c744aeae | 344 | * @new_parent: object's new parent (can be NULL) |
8a82472f CH |
345 | */ |
346 | ||
347 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) | |
348 | { | |
349 | int error; | |
350 | struct kobject *old_parent; | |
351 | const char *devpath = NULL; | |
352 | char *devpath_string = NULL; | |
353 | char *envp[2]; | |
354 | ||
355 | kobj = kobject_get(kobj); | |
356 | if (!kobj) | |
357 | return -EINVAL; | |
358 | new_parent = kobject_get(new_parent); | |
359 | if (!new_parent) { | |
c744aeae CH |
360 | if (kobj->kset) |
361 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f CH |
362 | } |
363 | /* old object path */ | |
364 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
365 | if (!devpath) { | |
366 | error = -ENOMEM; | |
367 | goto out; | |
368 | } | |
369 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
370 | if (!devpath_string) { | |
371 | error = -ENOMEM; | |
372 | goto out; | |
373 | } | |
374 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
375 | envp[0] = devpath_string; | |
376 | envp[1] = NULL; | |
377 | error = sysfs_move_dir(kobj, new_parent); | |
378 | if (error) | |
379 | goto out; | |
380 | old_parent = kobj->parent; | |
381 | kobj->parent = new_parent; | |
9e993efb | 382 | new_parent = NULL; |
8a82472f CH |
383 | kobject_put(old_parent); |
384 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
385 | out: | |
9e993efb | 386 | kobject_put(new_parent); |
8a82472f CH |
387 | kobject_put(kobj); |
388 | kfree(devpath_string); | |
389 | kfree(devpath); | |
390 | return error; | |
391 | } | |
392 | ||
1da177e4 LT |
393 | /** |
394 | * kobject_del - unlink kobject from hierarchy. | |
395 | * @kobj: object. | |
396 | */ | |
397 | ||
398 | void kobject_del(struct kobject * kobj) | |
399 | { | |
31b9025a GKH |
400 | if (!kobj) |
401 | return; | |
1da177e4 LT |
402 | sysfs_remove_dir(kobj); |
403 | unlink(kobj); | |
404 | } | |
405 | ||
406 | /** | |
407 | * kobject_unregister - remove object from hierarchy and decrement refcount. | |
408 | * @kobj: object going away. | |
409 | */ | |
410 | ||
411 | void kobject_unregister(struct kobject * kobj) | |
412 | { | |
31b9025a GKH |
413 | if (!kobj) |
414 | return; | |
1da177e4 | 415 | pr_debug("kobject %s: unregistering\n",kobject_name(kobj)); |
312c004d | 416 | kobject_uevent(kobj, KOBJ_REMOVE); |
1da177e4 LT |
417 | kobject_del(kobj); |
418 | kobject_put(kobj); | |
419 | } | |
420 | ||
421 | /** | |
422 | * kobject_get - increment refcount for object. | |
423 | * @kobj: object. | |
424 | */ | |
425 | ||
426 | struct kobject * kobject_get(struct kobject * kobj) | |
427 | { | |
428 | if (kobj) | |
429 | kref_get(&kobj->kref); | |
430 | return kobj; | |
431 | } | |
432 | ||
433 | /** | |
434 | * kobject_cleanup - free kobject resources. | |
435 | * @kobj: object. | |
436 | */ | |
437 | ||
438 | void kobject_cleanup(struct kobject * kobj) | |
439 | { | |
440 | struct kobj_type * t = get_ktype(kobj); | |
441 | struct kset * s = kobj->kset; | |
442 | struct kobject * parent = kobj->parent; | |
ce2c9cb0 | 443 | const char *name = kobj->k_name; |
1da177e4 LT |
444 | |
445 | pr_debug("kobject %s: cleaning up\n",kobject_name(kobj)); | |
ce2c9cb0 | 446 | if (t && t->release) { |
1da177e4 | 447 | t->release(kobj); |
ce2c9cb0 GKH |
448 | /* If we have a release function, we can guess that this was |
449 | * not a statically allocated kobject, so we should be safe to | |
450 | * free the name */ | |
451 | kfree(name); | |
452 | } | |
1da177e4 LT |
453 | if (s) |
454 | kset_put(s); | |
b067db49 | 455 | kobject_put(parent); |
1da177e4 LT |
456 | } |
457 | ||
458 | static void kobject_release(struct kref *kref) | |
459 | { | |
460 | kobject_cleanup(container_of(kref, struct kobject, kref)); | |
461 | } | |
462 | ||
463 | /** | |
464 | * kobject_put - decrement refcount for object. | |
465 | * @kobj: object. | |
466 | * | |
467 | * Decrement the refcount, and if 0, call kobject_cleanup(). | |
468 | */ | |
469 | void kobject_put(struct kobject * kobj) | |
470 | { | |
471 | if (kobj) | |
472 | kref_put(&kobj->kref, kobject_release); | |
473 | } | |
474 | ||
475 | ||
7423172a JN |
476 | static void dir_release(struct kobject *kobj) |
477 | { | |
478 | kfree(kobj); | |
479 | } | |
480 | ||
481 | static struct kobj_type dir_ktype = { | |
482 | .release = dir_release, | |
483 | .sysfs_ops = NULL, | |
484 | .default_attrs = NULL, | |
485 | }; | |
486 | ||
487 | /** | |
2753133e | 488 | * kobject_kset_add_dir - add sub directory of object. |
86406245 | 489 | * @kset: kset the directory is belongs to. |
7423172a JN |
490 | * @parent: object in which a directory is created. |
491 | * @name: directory name. | |
492 | * | |
493 | * Add a plain directory object as child of given object. | |
494 | */ | |
86406245 KS |
495 | struct kobject *kobject_kset_add_dir(struct kset *kset, |
496 | struct kobject *parent, const char *name) | |
7423172a JN |
497 | { |
498 | struct kobject *k; | |
10188012 | 499 | int ret; |
7423172a JN |
500 | |
501 | if (!parent) | |
502 | return NULL; | |
503 | ||
504 | k = kzalloc(sizeof(*k), GFP_KERNEL); | |
505 | if (!k) | |
506 | return NULL; | |
507 | ||
86406245 | 508 | k->kset = kset; |
7423172a JN |
509 | k->parent = parent; |
510 | k->ktype = &dir_ktype; | |
511 | kobject_set_name(k, name); | |
10188012 RD |
512 | ret = kobject_register(k); |
513 | if (ret < 0) { | |
2753133e EB |
514 | printk(KERN_WARNING "%s: kobject_register error: %d\n", |
515 | __func__, ret); | |
10188012 RD |
516 | kobject_del(k); |
517 | return NULL; | |
518 | } | |
7423172a JN |
519 | |
520 | return k; | |
521 | } | |
7423172a | 522 | |
2753133e EB |
523 | /** |
524 | * kobject_add_dir - add sub directory of object. | |
525 | * @parent: object in which a directory is created. | |
526 | * @name: directory name. | |
527 | * | |
528 | * Add a plain directory object as child of given object. | |
529 | */ | |
86406245 KS |
530 | struct kobject *kobject_add_dir(struct kobject *parent, const char *name) |
531 | { | |
532 | return kobject_kset_add_dir(NULL, parent, name); | |
533 | } | |
534 | ||
1da177e4 LT |
535 | /** |
536 | * kset_init - initialize a kset for use | |
537 | * @k: kset | |
538 | */ | |
539 | ||
540 | void kset_init(struct kset * k) | |
541 | { | |
542 | kobject_init(&k->kobj); | |
543 | INIT_LIST_HEAD(&k->list); | |
544 | spin_lock_init(&k->list_lock); | |
545 | } | |
546 | ||
547 | ||
548 | /** | |
549 | * kset_add - add a kset object to the hierarchy. | |
550 | * @k: kset. | |
1da177e4 LT |
551 | */ |
552 | ||
553 | int kset_add(struct kset * k) | |
554 | { | |
1da177e4 LT |
555 | return kobject_add(&k->kobj); |
556 | } | |
557 | ||
558 | ||
559 | /** | |
560 | * kset_register - initialize and add a kset. | |
561 | * @k: kset. | |
562 | */ | |
563 | ||
564 | int kset_register(struct kset * k) | |
565 | { | |
80f03e34 KS |
566 | int err; |
567 | ||
31b9025a GKH |
568 | if (!k) |
569 | return -EINVAL; | |
80f03e34 | 570 | |
1da177e4 | 571 | kset_init(k); |
80f03e34 KS |
572 | err = kset_add(k); |
573 | if (err) | |
574 | return err; | |
575 | kobject_uevent(&k->kobj, KOBJ_ADD); | |
576 | return 0; | |
1da177e4 LT |
577 | } |
578 | ||
579 | ||
580 | /** | |
581 | * kset_unregister - remove a kset. | |
582 | * @k: kset. | |
583 | */ | |
584 | ||
585 | void kset_unregister(struct kset * k) | |
586 | { | |
31b9025a GKH |
587 | if (!k) |
588 | return; | |
1da177e4 LT |
589 | kobject_unregister(&k->kobj); |
590 | } | |
591 | ||
592 | ||
593 | /** | |
594 | * kset_find_obj - search for object in kset. | |
595 | * @kset: kset we're looking in. | |
596 | * @name: object's name. | |
597 | * | |
598 | * Lock kset via @kset->subsys, and iterate over @kset->list, | |
599 | * looking for a matching kobject. If matching object is found | |
600 | * take a reference and return the object. | |
601 | */ | |
602 | ||
603 | struct kobject * kset_find_obj(struct kset * kset, const char * name) | |
604 | { | |
605 | struct list_head * entry; | |
606 | struct kobject * ret = NULL; | |
607 | ||
608 | spin_lock(&kset->list_lock); | |
609 | list_for_each(entry,&kset->list) { | |
610 | struct kobject * k = to_kobj(entry); | |
611 | if (kobject_name(k) && !strcmp(kobject_name(k),name)) { | |
612 | ret = kobject_get(k); | |
613 | break; | |
614 | } | |
615 | } | |
616 | spin_unlock(&kset->list_lock); | |
617 | return ret; | |
618 | } | |
619 | ||
823bccfc | 620 | int subsystem_register(struct kset *s) |
1da177e4 | 621 | { |
823bccfc | 622 | return kset_register(s); |
1da177e4 LT |
623 | } |
624 | ||
823bccfc | 625 | void subsystem_unregister(struct kset *s) |
1da177e4 | 626 | { |
823bccfc | 627 | kset_unregister(s); |
1da177e4 LT |
628 | } |
629 | ||
1da177e4 LT |
630 | /** |
631 | * subsystem_create_file - export sysfs attribute file. | |
632 | * @s: subsystem. | |
633 | * @a: subsystem attribute descriptor. | |
634 | */ | |
635 | ||
823bccfc | 636 | int subsys_create_file(struct kset *s, struct subsys_attribute *a) |
1da177e4 LT |
637 | { |
638 | int error = 0; | |
31b9025a GKH |
639 | |
640 | if (!s || !a) | |
641 | return -EINVAL; | |
642 | ||
1ef4cfac | 643 | if (kset_get(s)) { |
823bccfc | 644 | error = sysfs_create_file(&s->kobj, &a->attr); |
6e9d930d | 645 | kset_put(s); |
1da177e4 LT |
646 | } |
647 | return error; | |
648 | } | |
649 | ||
1da177e4 LT |
650 | EXPORT_SYMBOL(kobject_init); |
651 | EXPORT_SYMBOL(kobject_register); | |
652 | EXPORT_SYMBOL(kobject_unregister); | |
653 | EXPORT_SYMBOL(kobject_get); | |
654 | EXPORT_SYMBOL(kobject_put); | |
655 | EXPORT_SYMBOL(kobject_add); | |
656 | EXPORT_SYMBOL(kobject_del); | |
657 | ||
658 | EXPORT_SYMBOL(kset_register); | |
659 | EXPORT_SYMBOL(kset_unregister); | |
1da177e4 | 660 | |
1da177e4 LT |
661 | EXPORT_SYMBOL(subsystem_register); |
662 | EXPORT_SYMBOL(subsystem_unregister); | |
663 | EXPORT_SYMBOL(subsys_create_file); |