Commit | Line | Data |
---|---|---|
56d611a0 MS |
1 | /* |
2 | * RAM Oops/Panic logger | |
3 | * | |
4 | * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com> | |
9ba80d99 | 5 | * Copyright (C) 2011 Kees Cook <keescook@chromium.org> |
56d611a0 MS |
6 | * |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
19 | * 02110-1301 USA | |
20 | * | |
21 | */ | |
22 | ||
0169256e MS |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
56d611a0 | 25 | #include <linux/kernel.h> |
83c1b317 | 26 | #include <linux/err.h> |
56d611a0 | 27 | #include <linux/module.h> |
9ba80d99 | 28 | #include <linux/pstore.h> |
56d611a0 MS |
29 | #include <linux/time.h> |
30 | #include <linux/io.h> | |
31 | #include <linux/ioport.h> | |
c3b92ce9 | 32 | #include <linux/platform_device.h> |
13aefd72 | 33 | #include <linux/slab.h> |
1894a253 | 34 | #include <linux/pstore_ram.h> |
56d611a0 MS |
35 | |
36 | #define RAMOOPS_KERNMSG_HDR "====" | |
3e5c4fad | 37 | #define MIN_MEM_SIZE 4096UL |
56d611a0 | 38 | |
3e5c4fad SI |
39 | static ulong record_size = MIN_MEM_SIZE; |
40 | module_param(record_size, ulong, 0400); | |
41 | MODULE_PARM_DESC(record_size, | |
42 | "size of each dump done on oops/panic"); | |
56d611a0 | 43 | |
b5d38e9b AV |
44 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
45 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
46 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
47 | ||
56d611a0 MS |
48 | static ulong mem_address; |
49 | module_param(mem_address, ulong, 0400); | |
50 | MODULE_PARM_DESC(mem_address, | |
51 | "start of reserved RAM used to store oops/panic logs"); | |
52 | ||
53 | static ulong mem_size; | |
54 | module_param(mem_size, ulong, 0400); | |
55 | MODULE_PARM_DESC(mem_size, | |
56 | "size of reserved RAM used to store oops/panic logs"); | |
57 | ||
58 | static int dump_oops = 1; | |
59 | module_param(dump_oops, int, 0600); | |
60 | MODULE_PARM_DESC(dump_oops, | |
61 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
62 | ||
39eb7e97 AV |
63 | static int ramoops_ecc; |
64 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
65 | MODULE_PARM_DESC(ramoops_ecc, | |
5ca5d4e6 AV |
66 | "if non-zero, the option enables ECC support and specifies " |
67 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
68 | "bytes ECC)"); | |
39eb7e97 | 69 | |
9ba80d99 | 70 | struct ramoops_context { |
896fc1f0 | 71 | struct persistent_ram_zone **przs; |
b5d38e9b | 72 | struct persistent_ram_zone *cprz; |
56d611a0 MS |
73 | phys_addr_t phys_addr; |
74 | unsigned long size; | |
9ba80d99 | 75 | size_t record_size; |
b5d38e9b | 76 | size_t console_size; |
6b4d2a27 | 77 | int dump_oops; |
5ca5d4e6 | 78 | int ecc_size; |
cac2eb7b AV |
79 | unsigned int max_dump_cnt; |
80 | unsigned int dump_write_cnt; | |
81 | unsigned int dump_read_cnt; | |
b5d38e9b | 82 | unsigned int console_read_cnt; |
9ba80d99 KC |
83 | struct pstore_info pstore; |
84 | }; | |
56d611a0 | 85 | |
13aefd72 MS |
86 | static struct platform_device *dummy; |
87 | static struct ramoops_platform_data *dummy_data; | |
88 | ||
9ba80d99 KC |
89 | static int ramoops_pstore_open(struct pstore_info *psi) |
90 | { | |
91 | struct ramoops_context *cxt = psi->data; | |
92 | ||
cac2eb7b | 93 | cxt->dump_read_cnt = 0; |
b5d38e9b | 94 | cxt->console_read_cnt = 0; |
9ba80d99 KC |
95 | return 0; |
96 | } | |
97 | ||
755d66b4 AV |
98 | static struct persistent_ram_zone * |
99 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, | |
100 | u64 *id, | |
101 | enum pstore_type_id *typep, enum pstore_type_id type, | |
102 | bool update) | |
103 | { | |
104 | struct persistent_ram_zone *prz; | |
105 | int i = (*c)++; | |
106 | ||
107 | if (i >= max) | |
108 | return NULL; | |
109 | ||
110 | prz = przs[i]; | |
111 | ||
112 | if (update) { | |
113 | /* Update old/shadowed buffer. */ | |
114 | persistent_ram_save_old(prz); | |
115 | if (!persistent_ram_old_size(prz)) | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | *typep = type; | |
120 | *id = i; | |
121 | ||
122 | return prz; | |
123 | } | |
124 | ||
9ba80d99 KC |
125 | static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, |
126 | struct timespec *time, | |
127 | char **buf, | |
128 | struct pstore_info *psi) | |
56d611a0 | 129 | { |
9ba80d99 | 130 | ssize_t size; |
9ba80d99 | 131 | struct ramoops_context *cxt = psi->data; |
896fc1f0 | 132 | struct persistent_ram_zone *prz; |
9ba80d99 | 133 | |
755d66b4 AV |
134 | prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, |
135 | cxt->max_dump_cnt, id, type, | |
136 | PSTORE_TYPE_DMESG, 1); | |
b5d38e9b AV |
137 | if (!prz) |
138 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, | |
139 | 1, id, type, PSTORE_TYPE_CONSOLE, 0); | |
755d66b4 AV |
140 | if (!prz) |
141 | return 0; | |
896fc1f0 | 142 | |
9ba80d99 KC |
143 | /* TODO(kees): Bogus time for the moment. */ |
144 | time->tv_sec = 0; | |
145 | time->tv_nsec = 0; | |
146 | ||
896fc1f0 | 147 | size = persistent_ram_old_size(prz); |
9ba80d99 KC |
148 | *buf = kmalloc(size, GFP_KERNEL); |
149 | if (*buf == NULL) | |
150 | return -ENOMEM; | |
896fc1f0 | 151 | memcpy(*buf, persistent_ram_old(prz), size); |
9ba80d99 KC |
152 | |
153 | return size; | |
154 | } | |
155 | ||
896fc1f0 AV |
156 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz) |
157 | { | |
158 | char *hdr; | |
159 | struct timeval timestamp; | |
160 | size_t len; | |
161 | ||
162 | do_gettimeofday(×tamp); | |
163 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu\n", | |
164 | (long)timestamp.tv_sec, (long)timestamp.tv_usec); | |
165 | WARN_ON_ONCE(!hdr); | |
166 | len = hdr ? strlen(hdr) : 0; | |
167 | persistent_ram_write(prz, hdr, len); | |
168 | kfree(hdr); | |
169 | ||
170 | return len; | |
171 | } | |
172 | ||
9ba80d99 KC |
173 | static int ramoops_pstore_write(enum pstore_type_id type, |
174 | enum kmsg_dump_reason reason, | |
175 | u64 *id, | |
176 | unsigned int part, | |
177 | size_t size, struct pstore_info *psi) | |
178 | { | |
9ba80d99 | 179 | struct ramoops_context *cxt = psi->data; |
cac2eb7b | 180 | struct persistent_ram_zone *prz = cxt->przs[cxt->dump_write_cnt]; |
896fc1f0 | 181 | size_t hlen; |
9ba80d99 | 182 | |
b5d38e9b AV |
183 | if (type == PSTORE_TYPE_CONSOLE) { |
184 | if (!cxt->cprz) | |
185 | return -ENOMEM; | |
186 | persistent_ram_write(cxt->cprz, cxt->pstore.buf, size); | |
187 | return 0; | |
188 | } | |
189 | ||
9ba80d99 KC |
190 | if (type != PSTORE_TYPE_DMESG) |
191 | return -EINVAL; | |
56d611a0 | 192 | |
9ba80d99 KC |
193 | /* Out of the various dmesg dump types, ramoops is currently designed |
194 | * to only store crash logs, rather than storing general kernel logs. | |
195 | */ | |
fc2d557c | 196 | if (reason != KMSG_DUMP_OOPS && |
a3dd3323 | 197 | reason != KMSG_DUMP_PANIC) |
9ba80d99 | 198 | return -EINVAL; |
fc2d557c | 199 | |
9ba80d99 | 200 | /* Skip Oopes when configured to do so. */ |
6b4d2a27 | 201 | if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
202 | return -EINVAL; |
203 | ||
204 | /* Explicitly only take the first part of any new crash. | |
205 | * If our buffer is larger than kmsg_bytes, this can never happen, | |
206 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
207 | * report split across multiple records. | |
208 | */ | |
209 | if (part != 1) | |
210 | return -ENOSPC; | |
56d611a0 | 211 | |
896fc1f0 AV |
212 | hlen = ramoops_write_kmsg_hdr(prz); |
213 | if (size + hlen > prz->buffer_size) | |
214 | size = prz->buffer_size - hlen; | |
215 | persistent_ram_write(prz, cxt->pstore.buf, size); | |
56d611a0 | 216 | |
cac2eb7b | 217 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
218 | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, | |
223 | struct pstore_info *psi) | |
224 | { | |
9ba80d99 | 225 | struct ramoops_context *cxt = psi->data; |
b5d38e9b | 226 | struct persistent_ram_zone *prz; |
9ba80d99 | 227 | |
b5d38e9b AV |
228 | switch (type) { |
229 | case PSTORE_TYPE_DMESG: | |
230 | if (id >= cxt->max_dump_cnt) | |
231 | return -EINVAL; | |
232 | prz = cxt->przs[id]; | |
233 | break; | |
234 | case PSTORE_TYPE_CONSOLE: | |
235 | prz = cxt->cprz; | |
236 | break; | |
237 | default: | |
9ba80d99 | 238 | return -EINVAL; |
b5d38e9b | 239 | } |
9ba80d99 | 240 | |
b5d38e9b AV |
241 | persistent_ram_free_old(prz); |
242 | persistent_ram_zap(prz); | |
9ba80d99 KC |
243 | |
244 | return 0; | |
56d611a0 MS |
245 | } |
246 | ||
9ba80d99 KC |
247 | static struct ramoops_context oops_cxt = { |
248 | .pstore = { | |
249 | .owner = THIS_MODULE, | |
250 | .name = "ramoops", | |
251 | .open = ramoops_pstore_open, | |
252 | .read = ramoops_pstore_read, | |
253 | .write = ramoops_pstore_write, | |
254 | .erase = ramoops_pstore_erase, | |
255 | }, | |
256 | }; | |
257 | ||
f4c5d242 AV |
258 | static void ramoops_free_przs(struct ramoops_context *cxt) |
259 | { | |
260 | int i; | |
261 | ||
262 | if (!cxt->przs) | |
263 | return; | |
264 | ||
90b58d96 | 265 | for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++) |
f4c5d242 AV |
266 | persistent_ram_free(cxt->przs[i]); |
267 | kfree(cxt->przs); | |
268 | } | |
269 | ||
270 | static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, | |
271 | phys_addr_t *paddr, size_t dump_mem_sz) | |
272 | { | |
273 | int err = -ENOMEM; | |
274 | int i; | |
275 | ||
276 | if (!cxt->record_size) | |
277 | return 0; | |
278 | ||
279 | cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; | |
280 | if (!cxt->max_dump_cnt) | |
281 | return -ENOMEM; | |
282 | ||
283 | cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, | |
284 | GFP_KERNEL); | |
285 | if (!cxt->przs) { | |
286 | dev_err(dev, "failed to initialize a prz array for dumps\n"); | |
287 | return -ENOMEM; | |
288 | } | |
289 | ||
290 | for (i = 0; i < cxt->max_dump_cnt; i++) { | |
291 | size_t sz = cxt->record_size; | |
292 | ||
5ca5d4e6 | 293 | cxt->przs[i] = persistent_ram_new(*paddr, sz, cxt->ecc_size); |
f4c5d242 AV |
294 | if (IS_ERR(cxt->przs[i])) { |
295 | err = PTR_ERR(cxt->przs[i]); | |
296 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
297 | sz, (unsigned long long)*paddr, err); | |
298 | goto fail_prz; | |
299 | } | |
300 | *paddr += sz; | |
301 | } | |
302 | ||
303 | return 0; | |
304 | fail_prz: | |
305 | ramoops_free_przs(cxt); | |
306 | return err; | |
307 | } | |
308 | ||
b5d38e9b AV |
309 | static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, |
310 | struct persistent_ram_zone **prz, | |
311 | phys_addr_t *paddr, size_t sz) | |
312 | { | |
313 | if (!sz) | |
314 | return 0; | |
315 | ||
316 | if (*paddr + sz > *paddr + cxt->size) | |
317 | return -ENOMEM; | |
318 | ||
5ca5d4e6 | 319 | *prz = persistent_ram_new(*paddr, sz, cxt->ecc_size); |
b5d38e9b AV |
320 | if (IS_ERR(*prz)) { |
321 | int err = PTR_ERR(*prz); | |
322 | ||
323 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
324 | sz, (unsigned long long)*paddr, err); | |
325 | return err; | |
326 | } | |
327 | ||
328 | persistent_ram_zap(*prz); | |
329 | ||
330 | *paddr += sz; | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
924d3711 | 335 | static int __devinit ramoops_probe(struct platform_device *pdev) |
56d611a0 | 336 | { |
896fc1f0 | 337 | struct device *dev = &pdev->dev; |
c3b92ce9 | 338 | struct ramoops_platform_data *pdata = pdev->dev.platform_data; |
56d611a0 | 339 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
340 | size_t dump_mem_sz; |
341 | phys_addr_t paddr; | |
56d611a0 MS |
342 | int err = -EINVAL; |
343 | ||
9ba80d99 KC |
344 | /* Only a single ramoops area allowed at a time, so fail extra |
345 | * probes. | |
346 | */ | |
cac2eb7b | 347 | if (cxt->max_dump_cnt) |
9ba80d99 KC |
348 | goto fail_out; |
349 | ||
b5d38e9b AV |
350 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size)) { |
351 | pr_err("The memory size and the record/console size must be " | |
3e5c4fad | 352 | "non-zero\n"); |
9ba80d99 | 353 | goto fail_out; |
56d611a0 MS |
354 | } |
355 | ||
fdb59507 MS |
356 | pdata->mem_size = rounddown_pow_of_two(pdata->mem_size); |
357 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); | |
b5d38e9b | 358 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
56d611a0 | 359 | |
cac2eb7b | 360 | cxt->dump_read_cnt = 0; |
13aefd72 MS |
361 | cxt->size = pdata->mem_size; |
362 | cxt->phys_addr = pdata->mem_address; | |
3e5c4fad | 363 | cxt->record_size = pdata->record_size; |
b5d38e9b | 364 | cxt->console_size = pdata->console_size; |
6b4d2a27 | 365 | cxt->dump_oops = pdata->dump_oops; |
5ca5d4e6 | 366 | cxt->ecc_size = pdata->ecc_size; |
56d611a0 | 367 | |
f4c5d242 | 368 | paddr = cxt->phys_addr; |
896fc1f0 | 369 | |
b5d38e9b | 370 | dump_mem_sz = cxt->size - cxt->console_size; |
f4c5d242 | 371 | err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); |
b5d38e9b AV |
372 | if (err) |
373 | goto fail_out; | |
374 | ||
375 | err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, cxt->console_size); | |
376 | if (err) | |
377 | goto fail_init_cprz; | |
378 | ||
379 | if (!cxt->przs && !cxt->cprz) { | |
f4c5d242 | 380 | pr_err("memory size too small, minimum is %lu\n", |
b5d38e9b AV |
381 | cxt->console_size + cxt->record_size); |
382 | goto fail_cnt; | |
896fc1f0 AV |
383 | } |
384 | ||
9ba80d99 | 385 | cxt->pstore.data = cxt; |
b5d38e9b AV |
386 | /* |
387 | * Console can handle any buffer size, so prefer dumps buffer | |
388 | * size since usually it is smaller. | |
389 | */ | |
390 | if (cxt->przs) | |
391 | cxt->pstore.bufsize = cxt->przs[0]->buffer_size; | |
392 | else | |
393 | cxt->pstore.bufsize = cxt->cprz->buffer_size; | |
9ba80d99 KC |
394 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); |
395 | spin_lock_init(&cxt->pstore.buf_lock); | |
396 | if (!cxt->pstore.buf) { | |
397 | pr_err("cannot allocate pstore buffer\n"); | |
398 | goto fail_clear; | |
399 | } | |
400 | ||
9ba80d99 | 401 | err = pstore_register(&cxt->pstore); |
56d611a0 | 402 | if (err) { |
9ba80d99 | 403 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 404 | goto fail_buf; |
56d611a0 MS |
405 | } |
406 | ||
c755201e KC |
407 | /* |
408 | * Update the module parameter variables as well so they are visible | |
409 | * through /sys/module/ramoops/parameters/ | |
410 | */ | |
411 | mem_size = pdata->mem_size; | |
412 | mem_address = pdata->mem_address; | |
413 | record_size = pdata->record_size; | |
414 | dump_oops = pdata->dump_oops; | |
415 | ||
5ca5d4e6 | 416 | pr_info("attached 0x%lx@0x%llx, ecc: %d\n", |
d109a674 | 417 | cxt->size, (unsigned long long)cxt->phys_addr, |
5ca5d4e6 | 418 | cxt->ecc_size); |
9ba80d99 | 419 | |
56d611a0 MS |
420 | return 0; |
421 | ||
9ba80d99 KC |
422 | fail_buf: |
423 | kfree(cxt->pstore.buf); | |
424 | fail_clear: | |
425 | cxt->pstore.bufsize = 0; | |
cac2eb7b | 426 | cxt->max_dump_cnt = 0; |
b5d38e9b AV |
427 | fail_cnt: |
428 | kfree(cxt->cprz); | |
429 | fail_init_cprz: | |
f4c5d242 | 430 | ramoops_free_przs(cxt); |
9ba80d99 | 431 | fail_out: |
56d611a0 MS |
432 | return err; |
433 | } | |
434 | ||
c3b92ce9 | 435 | static int __exit ramoops_remove(struct platform_device *pdev) |
56d611a0 | 436 | { |
9ba80d99 KC |
437 | #if 0 |
438 | /* TODO(kees): We cannot unload ramoops since pstore doesn't support | |
439 | * unregistering yet. | |
440 | */ | |
56d611a0 MS |
441 | struct ramoops_context *cxt = &oops_cxt; |
442 | ||
56d611a0 MS |
443 | iounmap(cxt->virt_addr); |
444 | release_mem_region(cxt->phys_addr, cxt->size); | |
cac2eb7b | 445 | cxt->max_dump_cnt = 0; |
9ba80d99 KC |
446 | |
447 | /* TODO(kees): When pstore supports unregistering, call it here. */ | |
448 | kfree(cxt->pstore.buf); | |
449 | cxt->pstore.bufsize = 0; | |
450 | ||
c3b92ce9 | 451 | return 0; |
9ba80d99 KC |
452 | #endif |
453 | return -EBUSY; | |
56d611a0 MS |
454 | } |
455 | ||
c3b92ce9 | 456 | static struct platform_driver ramoops_driver = { |
924d3711 | 457 | .probe = ramoops_probe, |
c3b92ce9 KP |
458 | .remove = __exit_p(ramoops_remove), |
459 | .driver = { | |
460 | .name = "ramoops", | |
461 | .owner = THIS_MODULE, | |
462 | }, | |
463 | }; | |
464 | ||
924d3711 | 465 | static void ramoops_register_dummy(void) |
c3b92ce9 | 466 | { |
924d3711 AV |
467 | if (!mem_size) |
468 | return; | |
469 | ||
470 | pr_info("using module parameters\n"); | |
471 | ||
472 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
473 | if (!dummy_data) { | |
474 | pr_info("could not allocate pdata\n"); | |
475 | return; | |
13aefd72 MS |
476 | } |
477 | ||
924d3711 AV |
478 | dummy_data->mem_size = mem_size; |
479 | dummy_data->mem_address = mem_address; | |
480 | dummy_data->record_size = record_size; | |
481 | dummy_data->console_size = ramoops_console_size; | |
482 | dummy_data->dump_oops = dump_oops; | |
5ca5d4e6 AV |
483 | /* |
484 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
485 | * (using 1 byte for ECC isn't much of use anyway). | |
486 | */ | |
487 | dummy_data->ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; | |
924d3711 AV |
488 | |
489 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
490 | dummy_data, sizeof(struct ramoops_platform_data)); | |
491 | if (IS_ERR(dummy)) { | |
492 | pr_info("could not create platform device: %ld\n", | |
493 | PTR_ERR(dummy)); | |
494 | } | |
495 | } | |
496 | ||
497 | static int __init ramoops_init(void) | |
498 | { | |
499 | ramoops_register_dummy(); | |
500 | return platform_driver_register(&ramoops_driver); | |
c3b92ce9 | 501 | } |
924d3711 | 502 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
503 | |
504 | static void __exit ramoops_exit(void) | |
505 | { | |
506 | platform_driver_unregister(&ramoops_driver); | |
13aefd72 | 507 | kfree(dummy_data); |
c3b92ce9 | 508 | } |
56d611a0 MS |
509 | module_exit(ramoops_exit); |
510 | ||
511 | MODULE_LICENSE("GPL"); | |
512 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
513 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |