Commit | Line | Data |
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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Author: Artem Bityutskiy (Битюцкий Артём), Joern Engel | |
19 | */ | |
20 | ||
21 | /* | |
2ba3d76a DP |
22 | * This is a small driver which implements fake MTD devices on top of UBI |
23 | * volumes. This sounds strange, but it is in fact quite useful to make | |
24 | * MTD-oriented software (including all the legacy software) work on top of | |
25 | * UBI. | |
801c135c AB |
26 | * |
27 | * Gluebi emulates MTD devices of "MTD_UBIVOLUME" type. Their minimal I/O unit | |
2ba3d76a | 28 | * size (@mtd->writesize) is equivalent to the UBI minimal I/O unit. The |
801c135c AB |
29 | * eraseblock size is equivalent to the logical eraseblock size of the volume. |
30 | */ | |
31 | ||
2ba3d76a DP |
32 | #include <linux/err.h> |
33 | #include <linux/list.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
2ba3d76a | 35 | #include <linux/sched.h> |
3013ee31 | 36 | #include <linux/math64.h> |
2ba3d76a DP |
37 | #include <linux/module.h> |
38 | #include <linux/mutex.h> | |
39 | #include <linux/mtd/ubi.h> | |
40 | #include <linux/mtd/mtd.h> | |
41 | #include "ubi-media.h" | |
42 | ||
43 | #define err_msg(fmt, ...) \ | |
e28453bb | 44 | pr_err("gluebi (pid %d): %s: " fmt "\n", \ |
2ba3d76a DP |
45 | current->pid, __func__, ##__VA_ARGS__) |
46 | ||
47 | /** | |
48 | * struct gluebi_device - a gluebi device description data structure. | |
49 | * @mtd: emulated MTD device description object | |
50 | * @refcnt: gluebi device reference count | |
51 | * @desc: UBI volume descriptor | |
52 | * @ubi_num: UBI device number this gluebi device works on | |
53 | * @vol_id: ID of UBI volume this gluebi device works on | |
54 | * @list: link in a list of gluebi devices | |
55 | */ | |
56 | struct gluebi_device { | |
57 | struct mtd_info mtd; | |
58 | int refcnt; | |
59 | struct ubi_volume_desc *desc; | |
60 | int ubi_num; | |
61 | int vol_id; | |
62 | struct list_head list; | |
63 | }; | |
64 | ||
65 | /* List of all gluebi devices */ | |
66 | static LIST_HEAD(gluebi_devices); | |
67 | static DEFINE_MUTEX(devices_mutex); | |
68 | ||
69 | /** | |
70 | * find_gluebi_nolock - find a gluebi device. | |
71 | * @ubi_num: UBI device number | |
72 | * @vol_id: volume ID | |
73 | * | |
74 | * This function seraches for gluebi device corresponding to UBI device | |
75 | * @ubi_num and UBI volume @vol_id. Returns the gluebi device description | |
76 | * object in case of success and %NULL in case of failure. The caller has to | |
77 | * have the &devices_mutex locked. | |
78 | */ | |
79 | static struct gluebi_device *find_gluebi_nolock(int ubi_num, int vol_id) | |
80 | { | |
81 | struct gluebi_device *gluebi; | |
82 | ||
83 | list_for_each_entry(gluebi, &gluebi_devices, list) | |
84 | if (gluebi->ubi_num == ubi_num && gluebi->vol_id == vol_id) | |
85 | return gluebi; | |
86 | return NULL; | |
87 | } | |
801c135c AB |
88 | |
89 | /** | |
90 | * gluebi_get_device - get MTD device reference. | |
91 | * @mtd: the MTD device description object | |
92 | * | |
93 | * This function is called every time the MTD device is being opened and | |
94 | * implements the MTD get_device() operation. Returns zero in case of success | |
95 | * and a negative error code in case of failure. | |
96 | */ | |
97 | static int gluebi_get_device(struct mtd_info *mtd) | |
98 | { | |
2ba3d76a DP |
99 | struct gluebi_device *gluebi; |
100 | int ubi_mode = UBI_READONLY; | |
801c135c | 101 | |
2ba3d76a DP |
102 | if (!try_module_get(THIS_MODULE)) |
103 | return -ENODEV; | |
801c135c | 104 | |
2ba3d76a DP |
105 | if (mtd->flags & MTD_WRITEABLE) |
106 | ubi_mode = UBI_READWRITE; | |
107 | ||
108 | gluebi = container_of(mtd, struct gluebi_device, mtd); | |
109 | mutex_lock(&devices_mutex); | |
110 | if (gluebi->refcnt > 0) { | |
801c135c AB |
111 | /* |
112 | * The MTD device is already referenced and this is just one | |
113 | * more reference. MTD allows many users to open the same | |
114 | * volume simultaneously and do not distinguish between | |
115 | * readers/writers/exclusive openers as UBI does. So we do not | |
116 | * open the UBI volume again - just increase the reference | |
117 | * counter and return. | |
118 | */ | |
2ba3d76a DP |
119 | gluebi->refcnt += 1; |
120 | mutex_unlock(&devices_mutex); | |
801c135c AB |
121 | return 0; |
122 | } | |
123 | ||
124 | /* | |
125 | * This is the first reference to this UBI volume via the MTD device | |
126 | * interface. Open the corresponding volume in read-write mode. | |
127 | */ | |
2ba3d76a DP |
128 | gluebi->desc = ubi_open_volume(gluebi->ubi_num, gluebi->vol_id, |
129 | ubi_mode); | |
130 | if (IS_ERR(gluebi->desc)) { | |
131 | mutex_unlock(&devices_mutex); | |
132 | module_put(THIS_MODULE); | |
133 | return PTR_ERR(gluebi->desc); | |
134 | } | |
135 | gluebi->refcnt += 1; | |
136 | mutex_unlock(&devices_mutex); | |
801c135c AB |
137 | return 0; |
138 | } | |
139 | ||
140 | /** | |
141 | * gluebi_put_device - put MTD device reference. | |
142 | * @mtd: the MTD device description object | |
143 | * | |
144 | * This function is called every time the MTD device is being put. Returns | |
145 | * zero in case of success and a negative error code in case of failure. | |
146 | */ | |
147 | static void gluebi_put_device(struct mtd_info *mtd) | |
148 | { | |
2ba3d76a DP |
149 | struct gluebi_device *gluebi; |
150 | ||
151 | gluebi = container_of(mtd, struct gluebi_device, mtd); | |
152 | mutex_lock(&devices_mutex); | |
153 | gluebi->refcnt -= 1; | |
154 | if (gluebi->refcnt == 0) | |
155 | ubi_close_volume(gluebi->desc); | |
156 | module_put(THIS_MODULE); | |
157 | mutex_unlock(&devices_mutex); | |
801c135c AB |
158 | } |
159 | ||
160 | /** | |
161 | * gluebi_read - read operation of emulated MTD devices. | |
162 | * @mtd: MTD device description object | |
163 | * @from: absolute offset from where to read | |
164 | * @len: how many bytes to read | |
165 | * @retlen: count of read bytes is returned here | |
166 | * @buf: buffer to store the read data | |
167 | * | |
168 | * This function returns zero in case of success and a negative error code in | |
169 | * case of failure. | |
170 | */ | |
171 | static int gluebi_read(struct mtd_info *mtd, loff_t from, size_t len, | |
172 | size_t *retlen, unsigned char *buf) | |
173 | { | |
41c04384 | 174 | int err = 0, lnum, offs, bytes_left; |
2ba3d76a | 175 | struct gluebi_device *gluebi; |
801c135c | 176 | |
2ba3d76a | 177 | gluebi = container_of(mtd, struct gluebi_device, mtd); |
3013ee31 | 178 | lnum = div_u64_rem(from, mtd->erasesize, &offs); |
41c04384 EG |
179 | bytes_left = len; |
180 | while (bytes_left) { | |
801c135c AB |
181 | size_t to_read = mtd->erasesize - offs; |
182 | ||
41c04384 EG |
183 | if (to_read > bytes_left) |
184 | to_read = bytes_left; | |
801c135c | 185 | |
6fa3eb70 S |
186 | //err = ubi_read(gluebi->desc, lnum, buf, offs, to_read); |
187 | err = ubi_leb_read(gluebi->desc, lnum, buf, offs, to_read, 0); | |
801c135c AB |
188 | if (err) |
189 | break; | |
190 | ||
191 | lnum += 1; | |
192 | offs = 0; | |
41c04384 | 193 | bytes_left -= to_read; |
801c135c AB |
194 | buf += to_read; |
195 | } | |
196 | ||
41c04384 | 197 | *retlen = len - bytes_left; |
801c135c AB |
198 | return err; |
199 | } | |
200 | ||
201 | /** | |
202 | * gluebi_write - write operation of emulated MTD devices. | |
203 | * @mtd: MTD device description object | |
204 | * @to: absolute offset where to write | |
205 | * @len: how many bytes to write | |
206 | * @retlen: count of written bytes is returned here | |
207 | * @buf: buffer with data to write | |
208 | * | |
209 | * This function returns zero in case of success and a negative error code in | |
210 | * case of failure. | |
211 | */ | |
212 | static int gluebi_write(struct mtd_info *mtd, loff_t to, size_t len, | |
2ba3d76a | 213 | size_t *retlen, const u_char *buf) |
801c135c | 214 | { |
41c04384 | 215 | int err = 0, lnum, offs, bytes_left; |
2ba3d76a | 216 | struct gluebi_device *gluebi; |
801c135c | 217 | |
2ba3d76a | 218 | gluebi = container_of(mtd, struct gluebi_device, mtd); |
3013ee31 | 219 | lnum = div_u64_rem(to, mtd->erasesize, &offs); |
801c135c AB |
220 | |
221 | if (len % mtd->writesize || offs % mtd->writesize) | |
222 | return -EINVAL; | |
223 | ||
41c04384 EG |
224 | bytes_left = len; |
225 | while (bytes_left) { | |
801c135c AB |
226 | size_t to_write = mtd->erasesize - offs; |
227 | ||
41c04384 EG |
228 | if (to_write > bytes_left) |
229 | to_write = bytes_left; | |
801c135c | 230 | |
6fa3eb70 | 231 | //err = ubi_write(gluebi->desc, lnum, buf, offs, to_write); |
b36a261e | 232 | err = ubi_leb_write(gluebi->desc, lnum, buf, offs, to_write); |
801c135c AB |
233 | if (err) |
234 | break; | |
235 | ||
236 | lnum += 1; | |
237 | offs = 0; | |
41c04384 | 238 | bytes_left -= to_write; |
801c135c AB |
239 | buf += to_write; |
240 | } | |
241 | ||
41c04384 | 242 | *retlen = len - bytes_left; |
801c135c AB |
243 | return err; |
244 | } | |
245 | ||
246 | /** | |
247 | * gluebi_erase - erase operation of emulated MTD devices. | |
248 | * @mtd: the MTD device description object | |
249 | * @instr: the erase operation description | |
250 | * | |
251 | * This function calls the erase callback when finishes. Returns zero in case | |
252 | * of success and a negative error code in case of failure. | |
253 | */ | |
254 | static int gluebi_erase(struct mtd_info *mtd, struct erase_info *instr) | |
255 | { | |
256 | int err, i, lnum, count; | |
2ba3d76a | 257 | struct gluebi_device *gluebi; |
801c135c | 258 | |
69423d99 | 259 | if (mtd_mod_by_ws(instr->addr, mtd) || mtd_mod_by_ws(instr->len, mtd)) |
801c135c AB |
260 | return -EINVAL; |
261 | ||
69423d99 AH |
262 | lnum = mtd_div_by_eb(instr->addr, mtd); |
263 | count = mtd_div_by_eb(instr->len, mtd); | |
2ba3d76a | 264 | gluebi = container_of(mtd, struct gluebi_device, mtd); |
801c135c | 265 | |
6fa3eb70 S |
266 | #ifdef MTK_IPOH_SUPPORT |
267 | for (i = 0; i < count; i++) { | |
268 | err = ubi_leb_unmap(gluebi->desc, lnum + i); | |
269 | if (err) | |
270 | goto out_err; | |
271 | } | |
272 | #else | |
2ba3d76a DP |
273 | for (i = 0; i < count - 1; i++) { |
274 | err = ubi_leb_unmap(gluebi->desc, lnum + i); | |
801c135c AB |
275 | if (err) |
276 | goto out_err; | |
277 | } | |
801c135c AB |
278 | /* |
279 | * MTD erase operations are synchronous, so we have to make sure the | |
280 | * physical eraseblock is wiped out. | |
2ba3d76a DP |
281 | * |
282 | * Thus, perform leb_erase instead of leb_unmap operation - leb_erase | |
283 | * will wait for the end of operations | |
801c135c | 284 | */ |
2ba3d76a | 285 | err = ubi_leb_erase(gluebi->desc, lnum + i); |
801c135c AB |
286 | if (err) |
287 | goto out_err; | |
6fa3eb70 | 288 | #endif |
801c135c | 289 | |
9c9ec147 AB |
290 | instr->state = MTD_ERASE_DONE; |
291 | mtd_erase_callback(instr); | |
801c135c AB |
292 | return 0; |
293 | ||
294 | out_err: | |
295 | instr->state = MTD_ERASE_FAILED; | |
69423d99 | 296 | instr->fail_addr = (long long)lnum * mtd->erasesize; |
801c135c AB |
297 | return err; |
298 | } | |
299 | ||
300 | /** | |
2ba3d76a DP |
301 | * gluebi_create - create a gluebi device for an UBI volume. |
302 | * @di: UBI device description object | |
303 | * @vi: UBI volume description object | |
801c135c | 304 | * |
2ba3d76a | 305 | * This function is called when a new UBI volume is created in order to create |
801c135c AB |
306 | * corresponding fake MTD device. Returns zero in case of success and a |
307 | * negative error code in case of failure. | |
308 | */ | |
2ba3d76a DP |
309 | static int gluebi_create(struct ubi_device_info *di, |
310 | struct ubi_volume_info *vi) | |
801c135c | 311 | { |
2ba3d76a DP |
312 | struct gluebi_device *gluebi, *g; |
313 | struct mtd_info *mtd; | |
801c135c | 314 | |
2ba3d76a DP |
315 | gluebi = kzalloc(sizeof(struct gluebi_device), GFP_KERNEL); |
316 | if (!gluebi) | |
801c135c AB |
317 | return -ENOMEM; |
318 | ||
2ba3d76a DP |
319 | mtd = &gluebi->mtd; |
320 | mtd->name = kmemdup(vi->name, vi->name_len + 1, GFP_KERNEL); | |
321 | if (!mtd->name) { | |
322 | kfree(gluebi); | |
323 | return -ENOMEM; | |
324 | } | |
325 | ||
326 | gluebi->vol_id = vi->vol_id; | |
c8cc4525 | 327 | gluebi->ubi_num = vi->ubi_num; |
801c135c | 328 | mtd->type = MTD_UBIVOLUME; |
2ba3d76a | 329 | if (!di->ro_mode) |
801c135c | 330 | mtd->flags = MTD_WRITEABLE; |
801c135c | 331 | mtd->owner = THIS_MODULE; |
2ba3d76a DP |
332 | mtd->writesize = di->min_io_size; |
333 | mtd->erasesize = vi->usable_leb_size; | |
3c3c10bb AB |
334 | mtd->_read = gluebi_read; |
335 | mtd->_write = gluebi_write; | |
336 | mtd->_erase = gluebi_erase; | |
337 | mtd->_get_device = gluebi_get_device; | |
338 | mtd->_put_device = gluebi_put_device; | |
801c135c | 339 | |
941dfb07 | 340 | /* |
2ba3d76a | 341 | * In case of dynamic a volume, MTD device size is just volume size. In |
941dfb07 | 342 | * case of a static volume the size is equivalent to the amount of data |
cbd8a9d2 | 343 | * bytes. |
941dfb07 | 344 | */ |
2ba3d76a DP |
345 | if (vi->vol_type == UBI_DYNAMIC_VOLUME) |
346 | mtd->size = (unsigned long long)vi->usable_leb_size * vi->size; | |
cbd8a9d2 | 347 | else |
2ba3d76a DP |
348 | mtd->size = vi->used_bytes; |
349 | ||
350 | /* Just a sanity check - make sure this gluebi device does not exist */ | |
351 | mutex_lock(&devices_mutex); | |
352 | g = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
353 | if (g) | |
049333ce AB |
354 | err_msg("gluebi MTD device %d form UBI device %d volume %d already exists", |
355 | g->mtd.index, vi->ubi_num, vi->vol_id); | |
2ba3d76a | 356 | mutex_unlock(&devices_mutex); |
941dfb07 | 357 | |
ee0e87b1 | 358 | if (mtd_device_register(mtd, NULL, 0)) { |
2ba3d76a | 359 | err_msg("cannot add MTD device"); |
801c135c | 360 | kfree(mtd->name); |
2ba3d76a | 361 | kfree(gluebi); |
801c135c AB |
362 | return -ENFILE; |
363 | } | |
364 | ||
2ba3d76a DP |
365 | mutex_lock(&devices_mutex); |
366 | list_add_tail(&gluebi->list, &gluebi_devices); | |
367 | mutex_unlock(&devices_mutex); | |
801c135c AB |
368 | return 0; |
369 | } | |
370 | ||
371 | /** | |
2ba3d76a DP |
372 | * gluebi_remove - remove a gluebi device. |
373 | * @vi: UBI volume description object | |
801c135c | 374 | * |
2ba3d76a | 375 | * This function is called when an UBI volume is removed and it removes |
801c135c AB |
376 | * corresponding fake MTD device. Returns zero in case of success and a |
377 | * negative error code in case of failure. | |
378 | */ | |
2ba3d76a | 379 | static int gluebi_remove(struct ubi_volume_info *vi) |
801c135c | 380 | { |
2ba3d76a DP |
381 | int err = 0; |
382 | struct mtd_info *mtd; | |
383 | struct gluebi_device *gluebi; | |
384 | ||
385 | mutex_lock(&devices_mutex); | |
386 | gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
387 | if (!gluebi) { | |
049333ce AB |
388 | err_msg("got remove notification for unknown UBI device %d volume %d", |
389 | vi->ubi_num, vi->vol_id); | |
2ba3d76a DP |
390 | err = -ENOENT; |
391 | } else if (gluebi->refcnt) | |
392 | err = -EBUSY; | |
393 | else | |
394 | list_del(&gluebi->list); | |
395 | mutex_unlock(&devices_mutex); | |
396 | if (err) | |
397 | return err; | |
801c135c | 398 | |
2ba3d76a | 399 | mtd = &gluebi->mtd; |
ee0e87b1 | 400 | err = mtd_device_unregister(mtd); |
2ba3d76a | 401 | if (err) { |
049333ce AB |
402 | err_msg("cannot remove fake MTD device %d, UBI device %d, volume %d, error %d", |
403 | mtd->index, gluebi->ubi_num, gluebi->vol_id, err); | |
2ba3d76a DP |
404 | mutex_lock(&devices_mutex); |
405 | list_add_tail(&gluebi->list, &gluebi_devices); | |
406 | mutex_unlock(&devices_mutex); | |
801c135c | 407 | return err; |
2ba3d76a DP |
408 | } |
409 | ||
801c135c | 410 | kfree(mtd->name); |
2ba3d76a | 411 | kfree(gluebi); |
801c135c AB |
412 | return 0; |
413 | } | |
941dfb07 AB |
414 | |
415 | /** | |
2ba3d76a DP |
416 | * gluebi_updated - UBI volume was updated notifier. |
417 | * @vi: volume info structure | |
941dfb07 | 418 | * |
2ba3d76a DP |
419 | * This function is called every time an UBI volume is updated. It does nothing |
420 | * if te volume @vol is dynamic, and changes MTD device size if the | |
941dfb07 | 421 | * volume is static. This is needed because static volumes cannot be read past |
2ba3d76a DP |
422 | * data they contain. This function returns zero in case of success and a |
423 | * negative error code in case of error. | |
424 | */ | |
425 | static int gluebi_updated(struct ubi_volume_info *vi) | |
426 | { | |
427 | struct gluebi_device *gluebi; | |
428 | ||
429 | mutex_lock(&devices_mutex); | |
430 | gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
431 | if (!gluebi) { | |
432 | mutex_unlock(&devices_mutex); | |
049333ce AB |
433 | err_msg("got update notification for unknown UBI device %d volume %d", |
434 | vi->ubi_num, vi->vol_id); | |
2ba3d76a DP |
435 | return -ENOENT; |
436 | } | |
437 | ||
438 | if (vi->vol_type == UBI_STATIC_VOLUME) | |
439 | gluebi->mtd.size = vi->used_bytes; | |
440 | mutex_unlock(&devices_mutex); | |
441 | return 0; | |
442 | } | |
443 | ||
444 | /** | |
445 | * gluebi_resized - UBI volume was re-sized notifier. | |
446 | * @vi: volume info structure | |
447 | * | |
448 | * This function is called every time an UBI volume is re-size. It changes the | |
449 | * corresponding fake MTD device size. This function returns zero in case of | |
450 | * success and a negative error code in case of error. | |
451 | */ | |
452 | static int gluebi_resized(struct ubi_volume_info *vi) | |
453 | { | |
454 | struct gluebi_device *gluebi; | |
455 | ||
456 | mutex_lock(&devices_mutex); | |
457 | gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
458 | if (!gluebi) { | |
459 | mutex_unlock(&devices_mutex); | |
049333ce AB |
460 | err_msg("got update notification for unknown UBI device %d volume %d", |
461 | vi->ubi_num, vi->vol_id); | |
2ba3d76a DP |
462 | return -ENOENT; |
463 | } | |
464 | gluebi->mtd.size = vi->used_bytes; | |
465 | mutex_unlock(&devices_mutex); | |
466 | return 0; | |
467 | } | |
468 | ||
469 | /** | |
470 | * gluebi_notify - UBI notification handler. | |
471 | * @nb: registered notifier block | |
472 | * @l: notification type | |
473 | * @ptr: pointer to the &struct ubi_notification object | |
941dfb07 | 474 | */ |
2ba3d76a DP |
475 | static int gluebi_notify(struct notifier_block *nb, unsigned long l, |
476 | void *ns_ptr) | |
941dfb07 | 477 | { |
2ba3d76a DP |
478 | struct ubi_notification *nt = ns_ptr; |
479 | ||
480 | switch (l) { | |
481 | case UBI_VOLUME_ADDED: | |
482 | gluebi_create(&nt->di, &nt->vi); | |
483 | break; | |
484 | case UBI_VOLUME_REMOVED: | |
485 | gluebi_remove(&nt->vi); | |
486 | break; | |
487 | case UBI_VOLUME_RESIZED: | |
488 | gluebi_resized(&nt->vi); | |
489 | break; | |
490 | case UBI_VOLUME_UPDATED: | |
491 | gluebi_updated(&nt->vi); | |
492 | break; | |
493 | default: | |
494 | break; | |
495 | } | |
496 | return NOTIFY_OK; | |
497 | } | |
941dfb07 | 498 | |
2ba3d76a DP |
499 | static struct notifier_block gluebi_notifier = { |
500 | .notifier_call = gluebi_notify, | |
501 | }; | |
502 | ||
503 | static int __init ubi_gluebi_init(void) | |
504 | { | |
505 | return ubi_register_volume_notifier(&gluebi_notifier, 0); | |
941dfb07 | 506 | } |
2ba3d76a DP |
507 | |
508 | static void __exit ubi_gluebi_exit(void) | |
509 | { | |
510 | struct gluebi_device *gluebi, *g; | |
511 | ||
512 | list_for_each_entry_safe(gluebi, g, &gluebi_devices, list) { | |
513 | int err; | |
514 | struct mtd_info *mtd = &gluebi->mtd; | |
515 | ||
ee0e87b1 | 516 | err = mtd_device_unregister(mtd); |
2ba3d76a | 517 | if (err) |
049333ce AB |
518 | err_msg("error %d while removing gluebi MTD device %d, UBI device %d, volume %d - ignoring", |
519 | err, mtd->index, gluebi->ubi_num, | |
520 | gluebi->vol_id); | |
2ba3d76a DP |
521 | kfree(mtd->name); |
522 | kfree(gluebi); | |
523 | } | |
524 | ubi_unregister_volume_notifier(&gluebi_notifier); | |
525 | } | |
526 | ||
527 | module_init(ubi_gluebi_init); | |
528 | module_exit(ubi_gluebi_exit); | |
529 | MODULE_DESCRIPTION("MTD emulation layer over UBI volumes"); | |
530 | MODULE_AUTHOR("Artem Bityutskiy, Joern Engel"); | |
531 | MODULE_LICENSE("GPL"); |