Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
6d66f5cd TH |
2 | * fs/sysfs/file.c - sysfs regular (text) file implementation |
3 | * | |
4 | * Copyright (c) 2001-3 Patrick Mochel | |
5 | * Copyright (c) 2007 SUSE Linux Products GmbH | |
6 | * Copyright (c) 2007 Tejun Heo <teheo@suse.de> | |
7 | * | |
8 | * This file is released under the GPLv2. | |
9 | * | |
10 | * Please see Documentation/filesystems/sysfs.txt for more information. | |
1da177e4 LT |
11 | */ |
12 | ||
13 | #include <linux/module.h> | |
1da177e4 | 14 | #include <linux/kobject.h> |
815d2d50 | 15 | #include <linux/kallsyms.h> |
c6f87733 | 16 | #include <linux/slab.h> |
94bebf4d | 17 | #include <linux/list.h> |
52e8c209 | 18 | #include <linux/mutex.h> |
13c589d5 | 19 | #include <linux/seq_file.h> |
1da177e4 LT |
20 | |
21 | #include "sysfs.h" | |
414985ae | 22 | #include "../kernfs/kernfs-internal.h" |
f6acf8bb | 23 | |
375b611e TH |
24 | /* |
25 | * Determine ktype->sysfs_ops for the given sysfs_dirent. This function | |
26 | * must be called while holding an active reference. | |
27 | */ | |
28 | static const struct sysfs_ops *sysfs_file_ops(struct sysfs_dirent *sd) | |
29 | { | |
7c6e2d36 | 30 | struct kobject *kobj = sd->s_parent->priv; |
375b611e | 31 | |
517e64f5 | 32 | if (sd->s_flags & SYSFS_FLAG_LOCKDEP) |
785a162d | 33 | lockdep_assert_held(sd); |
375b611e TH |
34 | return kobj->ktype ? kobj->ktype->sysfs_ops : NULL; |
35 | } | |
36 | ||
13c589d5 TH |
37 | /* |
38 | * Reads on sysfs are handled through seq_file, which takes care of hairy | |
39 | * details like buffering and seeking. The following function pipes | |
40 | * sysfs_ops->show() result through seq_file. | |
1da177e4 | 41 | */ |
c2b19daf | 42 | static int sysfs_kf_seq_show(struct seq_file *sf, void *v) |
1da177e4 | 43 | { |
13c589d5 | 44 | struct sysfs_open_file *of = sf->private; |
7c6e2d36 | 45 | struct kobject *kobj = of->sd->s_parent->priv; |
c2b19daf | 46 | const struct sysfs_ops *ops = sysfs_file_ops(of->sd); |
1da177e4 | 47 | ssize_t count; |
c2b19daf | 48 | char *buf; |
1da177e4 | 49 | |
13c589d5 TH |
50 | /* acquire buffer and ensure that it's >= PAGE_SIZE */ |
51 | count = seq_get_buf(sf, &buf); | |
52 | if (count < PAGE_SIZE) { | |
53 | seq_commit(sf, -1); | |
54 | return 0; | |
55 | } | |
1da177e4 | 56 | |
13c589d5 | 57 | /* |
c2b19daf TH |
58 | * Invoke show(). Control may reach here via seq file lseek even |
59 | * if @ops->show() isn't implemented. | |
13c589d5 | 60 | */ |
c2b19daf | 61 | if (ops->show) { |
7c6e2d36 | 62 | count = ops->show(kobj, of->sd->priv, buf); |
c2b19daf TH |
63 | if (count < 0) |
64 | return count; | |
65 | } | |
0ab66088 | 66 | |
8118a859 MX |
67 | /* |
68 | * The code works fine with PAGE_SIZE return but it's likely to | |
69 | * indicate truncated result or overflow in normal use cases. | |
70 | */ | |
815d2d50 AM |
71 | if (count >= (ssize_t)PAGE_SIZE) { |
72 | print_symbol("fill_read_buffer: %s returned bad count\n", | |
73 | (unsigned long)ops->show); | |
74 | /* Try to struggle along */ | |
75 | count = PAGE_SIZE - 1; | |
76 | } | |
13c589d5 TH |
77 | seq_commit(sf, count); |
78 | return 0; | |
1da177e4 LT |
79 | } |
80 | ||
c2b19daf TH |
81 | static ssize_t sysfs_kf_bin_read(struct sysfs_open_file *of, char *buf, |
82 | size_t count, loff_t pos) | |
2f0c6b75 | 83 | { |
7c6e2d36 TH |
84 | struct bin_attribute *battr = of->sd->priv; |
85 | struct kobject *kobj = of->sd->s_parent->priv; | |
c2b19daf | 86 | loff_t size = file_inode(of->file)->i_size; |
2f0c6b75 | 87 | |
c2b19daf | 88 | if (!count) |
2f0c6b75 TH |
89 | return 0; |
90 | ||
91 | if (size) { | |
c2b19daf | 92 | if (pos > size) |
2f0c6b75 | 93 | return 0; |
c2b19daf TH |
94 | if (pos + count > size) |
95 | count = size - pos; | |
2f0c6b75 TH |
96 | } |
97 | ||
c2b19daf TH |
98 | if (!battr->read) |
99 | return -EIO; | |
100 | ||
101 | return battr->read(of->file, kobj, battr, buf, pos, count); | |
102 | } | |
103 | ||
50b38ca0 TH |
104 | /* kernfs write callback for regular sysfs files */ |
105 | static ssize_t sysfs_kf_write(struct sysfs_open_file *of, char *buf, | |
106 | size_t count, loff_t pos) | |
1da177e4 | 107 | { |
50b38ca0 | 108 | const struct sysfs_ops *ops = sysfs_file_ops(of->sd); |
7c6e2d36 | 109 | struct kobject *kobj = of->sd->s_parent->priv; |
0ab66088 | 110 | |
50b38ca0 TH |
111 | if (!count) |
112 | return 0; | |
0ab66088 | 113 | |
50b38ca0 TH |
114 | return ops->store(kobj, of->sd->priv, buf, count); |
115 | } | |
f9b9a621 | 116 | |
50b38ca0 TH |
117 | /* kernfs write callback for bin sysfs files */ |
118 | static ssize_t sysfs_kf_bin_write(struct sysfs_open_file *of, char *buf, | |
119 | size_t count, loff_t pos) | |
120 | { | |
121 | struct bin_attribute *battr = of->sd->priv; | |
122 | struct kobject *kobj = of->sd->s_parent->priv; | |
123 | loff_t size = file_inode(of->file)->i_size; | |
f9b9a621 | 124 | |
50b38ca0 TH |
125 | if (size) { |
126 | if (size <= pos) | |
127 | return 0; | |
128 | count = min_t(ssize_t, count, size - pos); | |
f9b9a621 | 129 | } |
50b38ca0 TH |
130 | if (!count) |
131 | return 0; | |
0ab66088 | 132 | |
50b38ca0 TH |
133 | if (!battr->write) |
134 | return -EIO; | |
1da177e4 | 135 | |
50b38ca0 | 136 | return battr->write(of->file, kobj, battr, buf, pos, count); |
1da177e4 LT |
137 | } |
138 | ||
fdbffaa4 TH |
139 | static int sysfs_kf_bin_mmap(struct sysfs_open_file *of, |
140 | struct vm_area_struct *vma) | |
141 | { | |
142 | struct bin_attribute *battr = of->sd->priv; | |
143 | struct kobject *kobj = of->sd->s_parent->priv; | |
144 | ||
145 | if (!battr->mmap) | |
146 | return -ENODEV; | |
147 | ||
148 | return battr->mmap(of->file, kobj, battr, vma); | |
149 | } | |
150 | ||
8c0e3998 | 151 | void sysfs_notify(struct kobject *k, const char *dir, const char *attr) |
4508a7a7 | 152 | { |
024f6471 | 153 | struct sysfs_dirent *sd = k->sd, *tmp; |
51225039 TH |
154 | |
155 | if (sd && dir) | |
ccf73cf3 | 156 | sd = kernfs_find_and_get(sd, dir); |
024f6471 | 157 | else |
ccf73cf3 | 158 | kernfs_get(sd); |
024f6471 TH |
159 | |
160 | if (sd && attr) { | |
ccf73cf3 TH |
161 | tmp = kernfs_find_and_get(sd, attr); |
162 | kernfs_put(sd); | |
024f6471 TH |
163 | sd = tmp; |
164 | } | |
51225039 | 165 | |
024f6471 TH |
166 | if (sd) { |
167 | kernfs_notify(sd); | |
ccf73cf3 | 168 | kernfs_put(sd); |
024f6471 | 169 | } |
4508a7a7 N |
170 | } |
171 | EXPORT_SYMBOL_GPL(sysfs_notify); | |
172 | ||
f6acf8bb TH |
173 | static const struct kernfs_ops sysfs_file_kfops_empty = { |
174 | }; | |
175 | ||
176 | static const struct kernfs_ops sysfs_file_kfops_ro = { | |
177 | .seq_show = sysfs_kf_seq_show, | |
178 | }; | |
179 | ||
180 | static const struct kernfs_ops sysfs_file_kfops_wo = { | |
181 | .write = sysfs_kf_write, | |
182 | }; | |
183 | ||
184 | static const struct kernfs_ops sysfs_file_kfops_rw = { | |
185 | .seq_show = sysfs_kf_seq_show, | |
186 | .write = sysfs_kf_write, | |
187 | }; | |
188 | ||
189 | static const struct kernfs_ops sysfs_bin_kfops_ro = { | |
190 | .read = sysfs_kf_bin_read, | |
191 | }; | |
192 | ||
193 | static const struct kernfs_ops sysfs_bin_kfops_wo = { | |
194 | .write = sysfs_kf_bin_write, | |
195 | }; | |
196 | ||
197 | static const struct kernfs_ops sysfs_bin_kfops_rw = { | |
198 | .read = sysfs_kf_bin_read, | |
199 | .write = sysfs_kf_bin_write, | |
200 | .mmap = sysfs_kf_bin_mmap, | |
201 | }; | |
202 | ||
58292cbe | 203 | int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd, |
a7dc66df | 204 | const struct attribute *attr, bool is_bin, |
496f7394 | 205 | umode_t mode, const void *ns) |
1da177e4 | 206 | { |
517e64f5 | 207 | struct lock_class_key *key = NULL; |
f6acf8bb | 208 | const struct kernfs_ops *ops; |
a26cd722 | 209 | struct sysfs_dirent *sd; |
471bd7b7 | 210 | loff_t size; |
1da177e4 | 211 | |
a7dc66df | 212 | if (!is_bin) { |
f6acf8bb TH |
213 | struct kobject *kobj = dir_sd->priv; |
214 | const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops; | |
215 | ||
216 | /* every kobject with an attribute needs a ktype assigned */ | |
217 | if (WARN(!sysfs_ops, KERN_ERR | |
218 | "missing sysfs attribute operations for kobject: %s\n", | |
219 | kobject_name(kobj))) | |
220 | return -EINVAL; | |
221 | ||
222 | if (sysfs_ops->show && sysfs_ops->store) | |
223 | ops = &sysfs_file_kfops_rw; | |
224 | else if (sysfs_ops->show) | |
225 | ops = &sysfs_file_kfops_ro; | |
226 | else if (sysfs_ops->store) | |
227 | ops = &sysfs_file_kfops_wo; | |
228 | else | |
229 | ops = &sysfs_file_kfops_empty; | |
471bd7b7 TH |
230 | |
231 | size = PAGE_SIZE; | |
f6acf8bb TH |
232 | } else { |
233 | struct bin_attribute *battr = (void *)attr; | |
234 | ||
235 | if ((battr->read && battr->write) || battr->mmap) | |
236 | ops = &sysfs_bin_kfops_rw; | |
237 | else if (battr->read) | |
238 | ops = &sysfs_bin_kfops_ro; | |
239 | else if (battr->write) | |
240 | ops = &sysfs_bin_kfops_wo; | |
241 | else | |
242 | ops = &sysfs_file_kfops_empty; | |
471bd7b7 TH |
243 | |
244 | size = battr->size; | |
f6acf8bb TH |
245 | } |
246 | ||
517e64f5 TH |
247 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
248 | if (!attr->ignore_lockdep) | |
249 | key = attr->key ?: (struct lock_class_key *)&attr->skey; | |
250 | #endif | |
251 | sd = kernfs_create_file_ns_key(dir_sd, attr->name, mode, size, | |
252 | ops, (void *)attr, ns, key); | |
496f7394 TH |
253 | if (IS_ERR(sd)) { |
254 | if (PTR_ERR(sd) == -EEXIST) | |
255 | sysfs_warn_dup(dir_sd, attr->name); | |
256 | return PTR_ERR(sd); | |
257 | } | |
258 | return 0; | |
259 | } | |
260 | ||
0f423895 | 261 | int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr, |
a7dc66df | 262 | bool is_bin) |
0f423895 | 263 | { |
a7dc66df | 264 | return sysfs_add_file_mode_ns(dir_sd, attr, is_bin, attr->mode, NULL); |
0f423895 JB |
265 | } |
266 | ||
1da177e4 | 267 | /** |
58292cbe TH |
268 | * sysfs_create_file_ns - create an attribute file for an object with custom ns |
269 | * @kobj: object we're creating for | |
270 | * @attr: attribute descriptor | |
271 | * @ns: namespace the new file should belong to | |
1da177e4 | 272 | */ |
58292cbe TH |
273 | int sysfs_create_file_ns(struct kobject *kobj, const struct attribute *attr, |
274 | const void *ns) | |
1da177e4 | 275 | { |
608e266a | 276 | BUG_ON(!kobj || !kobj->sd || !attr); |
1da177e4 | 277 | |
a7dc66df | 278 | return sysfs_add_file_mode_ns(kobj->sd, attr, false, attr->mode, ns); |
1da177e4 LT |
279 | |
280 | } | |
58292cbe | 281 | EXPORT_SYMBOL_GPL(sysfs_create_file_ns); |
1da177e4 | 282 | |
1c205ae1 AK |
283 | int sysfs_create_files(struct kobject *kobj, const struct attribute **ptr) |
284 | { | |
285 | int err = 0; | |
286 | int i; | |
287 | ||
288 | for (i = 0; ptr[i] && !err; i++) | |
289 | err = sysfs_create_file(kobj, ptr[i]); | |
290 | if (err) | |
291 | while (--i >= 0) | |
292 | sysfs_remove_file(kobj, ptr[i]); | |
293 | return err; | |
294 | } | |
1b866757 | 295 | EXPORT_SYMBOL_GPL(sysfs_create_files); |
1da177e4 | 296 | |
dfa87c82 AS |
297 | /** |
298 | * sysfs_add_file_to_group - add an attribute file to a pre-existing group. | |
299 | * @kobj: object we're acting for. | |
300 | * @attr: attribute descriptor. | |
301 | * @group: group name. | |
302 | */ | |
303 | int sysfs_add_file_to_group(struct kobject *kobj, | |
304 | const struct attribute *attr, const char *group) | |
305 | { | |
608e266a | 306 | struct sysfs_dirent *dir_sd; |
dfa87c82 AS |
307 | int error; |
308 | ||
ccf73cf3 TH |
309 | if (group) { |
310 | dir_sd = kernfs_find_and_get(kobj->sd, group); | |
311 | } else { | |
312 | dir_sd = kobj->sd; | |
313 | kernfs_get(dir_sd); | |
314 | } | |
11f24fbd | 315 | |
608e266a TH |
316 | if (!dir_sd) |
317 | return -ENOENT; | |
318 | ||
a7dc66df | 319 | error = sysfs_add_file(dir_sd, attr, false); |
ccf73cf3 | 320 | kernfs_put(dir_sd); |
608e266a | 321 | |
dfa87c82 AS |
322 | return error; |
323 | } | |
324 | EXPORT_SYMBOL_GPL(sysfs_add_file_to_group); | |
325 | ||
31e5abe9 KS |
326 | /** |
327 | * sysfs_chmod_file - update the modified mode value on an object attribute. | |
328 | * @kobj: object we're acting for. | |
329 | * @attr: attribute descriptor. | |
330 | * @mode: file permissions. | |
331 | * | |
332 | */ | |
49c19400 | 333 | int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr, |
48176a97 | 334 | umode_t mode) |
31e5abe9 | 335 | { |
06fc0d66 | 336 | struct sysfs_dirent *sd; |
bc062b1b | 337 | struct iattr newattrs; |
51225039 TH |
338 | int rc; |
339 | ||
ccf73cf3 | 340 | sd = kernfs_find_and_get(kobj->sd, attr->name); |
06fc0d66 | 341 | if (!sd) |
5d60418e | 342 | return -ENOENT; |
f88123ea | 343 | |
06fc0d66 | 344 | newattrs.ia_mode = (mode & S_IALLUGO) | (sd->s_mode & ~S_IALLUGO); |
4c6974f5 | 345 | newattrs.ia_valid = ATTR_MODE; |
f88123ea | 346 | |
5d60418e TH |
347 | rc = kernfs_setattr(sd, &newattrs); |
348 | ||
ccf73cf3 | 349 | kernfs_put(sd); |
51225039 | 350 | return rc; |
31e5abe9 KS |
351 | } |
352 | EXPORT_SYMBOL_GPL(sysfs_chmod_file); | |
353 | ||
1da177e4 | 354 | /** |
58292cbe TH |
355 | * sysfs_remove_file_ns - remove an object attribute with a custom ns tag |
356 | * @kobj: object we're acting for | |
357 | * @attr: attribute descriptor | |
358 | * @ns: namespace tag of the file to remove | |
1da177e4 | 359 | * |
58292cbe | 360 | * Hash the attribute name and namespace tag and kill the victim. |
1da177e4 | 361 | */ |
58292cbe TH |
362 | void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr, |
363 | const void *ns) | |
1da177e4 | 364 | { |
58292cbe | 365 | struct sysfs_dirent *dir_sd = kobj->sd; |
487505c2 | 366 | |
879f40d1 | 367 | kernfs_remove_by_name_ns(dir_sd, attr->name, ns); |
1da177e4 | 368 | } |
58292cbe | 369 | EXPORT_SYMBOL_GPL(sysfs_remove_file_ns); |
1da177e4 | 370 | |
1b18dc2b | 371 | void sysfs_remove_files(struct kobject *kobj, const struct attribute **ptr) |
1c205ae1 AK |
372 | { |
373 | int i; | |
374 | for (i = 0; ptr[i]; i++) | |
375 | sysfs_remove_file(kobj, ptr[i]); | |
376 | } | |
1b866757 | 377 | EXPORT_SYMBOL_GPL(sysfs_remove_files); |
1da177e4 | 378 | |
dfa87c82 AS |
379 | /** |
380 | * sysfs_remove_file_from_group - remove an attribute file from a group. | |
381 | * @kobj: object we're acting for. | |
382 | * @attr: attribute descriptor. | |
383 | * @group: group name. | |
384 | */ | |
385 | void sysfs_remove_file_from_group(struct kobject *kobj, | |
386 | const struct attribute *attr, const char *group) | |
387 | { | |
608e266a | 388 | struct sysfs_dirent *dir_sd; |
dfa87c82 | 389 | |
ccf73cf3 TH |
390 | if (group) { |
391 | dir_sd = kernfs_find_and_get(kobj->sd, group); | |
392 | } else { | |
393 | dir_sd = kobj->sd; | |
394 | kernfs_get(dir_sd); | |
395 | } | |
396 | ||
608e266a | 397 | if (dir_sd) { |
879f40d1 | 398 | kernfs_remove_by_name(dir_sd, attr->name); |
ccf73cf3 | 399 | kernfs_put(dir_sd); |
dfa87c82 AS |
400 | } |
401 | } | |
402 | EXPORT_SYMBOL_GPL(sysfs_remove_file_from_group); | |
403 | ||
3124eb16 TH |
404 | /** |
405 | * sysfs_create_bin_file - create binary file for object. | |
406 | * @kobj: object. | |
407 | * @attr: attribute descriptor. | |
408 | */ | |
409 | int sysfs_create_bin_file(struct kobject *kobj, | |
410 | const struct bin_attribute *attr) | |
411 | { | |
412 | BUG_ON(!kobj || !kobj->sd || !attr); | |
413 | ||
a7dc66df | 414 | return sysfs_add_file(kobj->sd, &attr->attr, true); |
3124eb16 TH |
415 | } |
416 | EXPORT_SYMBOL_GPL(sysfs_create_bin_file); | |
417 | ||
418 | /** | |
419 | * sysfs_remove_bin_file - remove binary file for object. | |
420 | * @kobj: object. | |
421 | * @attr: attribute descriptor. | |
422 | */ | |
423 | void sysfs_remove_bin_file(struct kobject *kobj, | |
424 | const struct bin_attribute *attr) | |
425 | { | |
879f40d1 | 426 | kernfs_remove_by_name(kobj->sd, attr->attr.name); |
3124eb16 TH |
427 | } |
428 | EXPORT_SYMBOL_GPL(sysfs_remove_bin_file); | |
429 | ||
d9a9cdfb | 430 | struct sysfs_schedule_callback_struct { |
66942064 AC |
431 | struct list_head workq_list; |
432 | struct kobject *kobj; | |
d9a9cdfb AS |
433 | void (*func)(void *); |
434 | void *data; | |
523ded71 | 435 | struct module *owner; |
d9a9cdfb AS |
436 | struct work_struct work; |
437 | }; | |
438 | ||
d110271e | 439 | static struct workqueue_struct *sysfs_workqueue; |
66942064 AC |
440 | static DEFINE_MUTEX(sysfs_workq_mutex); |
441 | static LIST_HEAD(sysfs_workq); | |
d9a9cdfb AS |
442 | static void sysfs_schedule_callback_work(struct work_struct *work) |
443 | { | |
444 | struct sysfs_schedule_callback_struct *ss = container_of(work, | |
445 | struct sysfs_schedule_callback_struct, work); | |
446 | ||
447 | (ss->func)(ss->data); | |
448 | kobject_put(ss->kobj); | |
523ded71 | 449 | module_put(ss->owner); |
66942064 AC |
450 | mutex_lock(&sysfs_workq_mutex); |
451 | list_del(&ss->workq_list); | |
452 | mutex_unlock(&sysfs_workq_mutex); | |
d9a9cdfb AS |
453 | kfree(ss); |
454 | } | |
455 | ||
456 | /** | |
457 | * sysfs_schedule_callback - helper to schedule a callback for a kobject | |
458 | * @kobj: object we're acting for. | |
459 | * @func: callback function to invoke later. | |
460 | * @data: argument to pass to @func. | |
523ded71 | 461 | * @owner: module owning the callback code |
d9a9cdfb AS |
462 | * |
463 | * sysfs attribute methods must not unregister themselves or their parent | |
464 | * kobject (which would amount to the same thing). Attempts to do so will | |
465 | * deadlock, since unregistration is mutually exclusive with driver | |
466 | * callbacks. | |
467 | * | |
468 | * Instead methods can call this routine, which will attempt to allocate | |
469 | * and schedule a workqueue request to call back @func with @data as its | |
470 | * argument in the workqueue's process context. @kobj will be pinned | |
471 | * until @func returns. | |
472 | * | |
473 | * Returns 0 if the request was submitted, -ENOMEM if storage could not | |
66942064 AC |
474 | * be allocated, -ENODEV if a reference to @owner isn't available, |
475 | * -EAGAIN if a callback has already been scheduled for @kobj. | |
d9a9cdfb AS |
476 | */ |
477 | int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *), | |
523ded71 | 478 | void *data, struct module *owner) |
d9a9cdfb | 479 | { |
66942064 | 480 | struct sysfs_schedule_callback_struct *ss, *tmp; |
d9a9cdfb | 481 | |
523ded71 AS |
482 | if (!try_module_get(owner)) |
483 | return -ENODEV; | |
66942064 AC |
484 | |
485 | mutex_lock(&sysfs_workq_mutex); | |
486 | list_for_each_entry_safe(ss, tmp, &sysfs_workq, workq_list) | |
487 | if (ss->kobj == kobj) { | |
d110271e | 488 | module_put(owner); |
66942064 AC |
489 | mutex_unlock(&sysfs_workq_mutex); |
490 | return -EAGAIN; | |
491 | } | |
492 | mutex_unlock(&sysfs_workq_mutex); | |
493 | ||
d110271e | 494 | if (sysfs_workqueue == NULL) { |
086a377e | 495 | sysfs_workqueue = create_singlethread_workqueue("sysfsd"); |
d110271e AC |
496 | if (sysfs_workqueue == NULL) { |
497 | module_put(owner); | |
498 | return -ENOMEM; | |
499 | } | |
500 | } | |
501 | ||
d9a9cdfb | 502 | ss = kmalloc(sizeof(*ss), GFP_KERNEL); |
523ded71 AS |
503 | if (!ss) { |
504 | module_put(owner); | |
d9a9cdfb | 505 | return -ENOMEM; |
523ded71 | 506 | } |
d9a9cdfb AS |
507 | kobject_get(kobj); |
508 | ss->kobj = kobj; | |
509 | ss->func = func; | |
510 | ss->data = data; | |
523ded71 | 511 | ss->owner = owner; |
d9a9cdfb | 512 | INIT_WORK(&ss->work, sysfs_schedule_callback_work); |
66942064 AC |
513 | INIT_LIST_HEAD(&ss->workq_list); |
514 | mutex_lock(&sysfs_workq_mutex); | |
515 | list_add_tail(&ss->workq_list, &sysfs_workq); | |
516 | mutex_unlock(&sysfs_workq_mutex); | |
d110271e | 517 | queue_work(sysfs_workqueue, &ss->work); |
d9a9cdfb AS |
518 | return 0; |
519 | } | |
520 | EXPORT_SYMBOL_GPL(sysfs_schedule_callback); |