1 /*
2 * Copyright (C) 2006-2008 Nokia Corporation
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published by
6 * the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; see the file COPYING. If not, write to the Free Software
15 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
16 *
17 * Test OOB read and write on MTD device.
18 *
19 * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
20 */
21
22 #include <asm/div64.h>
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/err.h>
27 #include <linux/mtd/mtd.h>
28 #include <linux/slab.h>
29 #include <linux/sched.h>
30
31 #define PRINT_PREF KERN_INFO "mtd_oobtest: "
32
33 static int dev = -EINVAL;
34 module_param(dev, int, S_IRUGO);
35 MODULE_PARM_DESC(dev, "MTD device number to use");
36
37 static struct mtd_info *mtd;
38 static unsigned char *readbuf;
39 static unsigned char *writebuf;
40 static unsigned char *bbt;
41
42 static int ebcnt;
43 static int pgcnt;
44 static int errcnt;
45 static int use_offset;
46 static int use_len;
47 static int use_len_max;
48 static int vary_offset;
49 static unsigned long next = 1;
50
simple_rand(void)51 static inline unsigned int simple_rand(void)
52 {
53 next = next * 1103515245 + 12345;
54 return (unsigned int)((next / 65536) % 32768);
55 }
56
simple_srand(unsigned long seed)57 static inline void simple_srand(unsigned long seed)
58 {
59 next = seed;
60 }
61
set_random_data(unsigned char * buf,size_t len)62 static void set_random_data(unsigned char *buf, size_t len)
63 {
64 size_t i;
65
66 for (i = 0; i < len; ++i)
67 buf[i] = simple_rand();
68 }
69
erase_eraseblock(int ebnum)70 static int erase_eraseblock(int ebnum)
71 {
72 int err;
73 struct erase_info ei;
74 loff_t addr = ebnum * mtd->erasesize;
75
76 memset(&ei, 0, sizeof(struct erase_info));
77 ei.mtd = mtd;
78 ei.addr = addr;
79 ei.len = mtd->erasesize;
80
81 err = mtd_erase(mtd, &ei);
82 if (err) {
83 printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
84 return err;
85 }
86
87 if (ei.state == MTD_ERASE_FAILED) {
88 printk(PRINT_PREF "some erase error occurred at EB %d\n",
89 ebnum);
90 return -EIO;
91 }
92
93 return 0;
94 }
95
erase_whole_device(void)96 static int erase_whole_device(void)
97 {
98 int err;
99 unsigned int i;
100
101 printk(PRINT_PREF "erasing whole device\n");
102 for (i = 0; i < ebcnt; ++i) {
103 if (bbt[i])
104 continue;
105 err = erase_eraseblock(i);
106 if (err)
107 return err;
108 cond_resched();
109 }
110 printk(PRINT_PREF "erased %u eraseblocks\n", i);
111 return 0;
112 }
113
do_vary_offset(void)114 static void do_vary_offset(void)
115 {
116 use_len -= 1;
117 if (use_len < 1) {
118 use_offset += 1;
119 if (use_offset >= use_len_max)
120 use_offset = 0;
121 use_len = use_len_max - use_offset;
122 }
123 }
124
write_eraseblock(int ebnum)125 static int write_eraseblock(int ebnum)
126 {
127 int i;
128 struct mtd_oob_ops ops;
129 int err = 0;
130 loff_t addr = ebnum * mtd->erasesize;
131
132 for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
133 set_random_data(writebuf, use_len);
134 ops.mode = MTD_OPS_AUTO_OOB;
135 ops.len = 0;
136 ops.retlen = 0;
137 ops.ooblen = use_len;
138 ops.oobretlen = 0;
139 ops.ooboffs = use_offset;
140 ops.datbuf = NULL;
141 ops.oobbuf = writebuf;
142 err = mtd_write_oob(mtd, addr, &ops);
143 if (err || ops.oobretlen != use_len) {
144 printk(PRINT_PREF "error: writeoob failed at %#llx\n",
145 (long long)addr);
146 printk(PRINT_PREF "error: use_len %d, use_offset %d\n",
147 use_len, use_offset);
148 errcnt += 1;
149 return err ? err : -1;
150 }
151 if (vary_offset)
152 do_vary_offset();
153 }
154
155 return err;
156 }
157
write_whole_device(void)158 static int write_whole_device(void)
159 {
160 int err;
161 unsigned int i;
162
163 printk(PRINT_PREF "writing OOBs of whole device\n");
164 for (i = 0; i < ebcnt; ++i) {
165 if (bbt[i])
166 continue;
167 err = write_eraseblock(i);
168 if (err)
169 return err;
170 if (i % 256 == 0)
171 printk(PRINT_PREF "written up to eraseblock %u\n", i);
172 cond_resched();
173 }
174 printk(PRINT_PREF "written %u eraseblocks\n", i);
175 return 0;
176 }
177
verify_eraseblock(int ebnum)178 static int verify_eraseblock(int ebnum)
179 {
180 int i;
181 struct mtd_oob_ops ops;
182 int err = 0;
183 loff_t addr = ebnum * mtd->erasesize;
184
185 for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
186 set_random_data(writebuf, use_len);
187 ops.mode = MTD_OPS_AUTO_OOB;
188 ops.len = 0;
189 ops.retlen = 0;
190 ops.ooblen = use_len;
191 ops.oobretlen = 0;
192 ops.ooboffs = use_offset;
193 ops.datbuf = NULL;
194 ops.oobbuf = readbuf;
195 err = mtd_read_oob(mtd, addr, &ops);
196 if (err || ops.oobretlen != use_len) {
197 printk(PRINT_PREF "error: readoob failed at %#llx\n",
198 (long long)addr);
199 errcnt += 1;
200 return err ? err : -1;
201 }
202 if (memcmp(readbuf, writebuf, use_len)) {
203 printk(PRINT_PREF "error: verify failed at %#llx\n",
204 (long long)addr);
205 errcnt += 1;
206 if (errcnt > 1000) {
207 printk(PRINT_PREF "error: too many errors\n");
208 return -1;
209 }
210 }
211 if (use_offset != 0 || use_len < mtd->ecclayout->oobavail) {
212 int k;
213
214 ops.mode = MTD_OPS_AUTO_OOB;
215 ops.len = 0;
216 ops.retlen = 0;
217 ops.ooblen = mtd->ecclayout->oobavail;
218 ops.oobretlen = 0;
219 ops.ooboffs = 0;
220 ops.datbuf = NULL;
221 ops.oobbuf = readbuf;
222 err = mtd_read_oob(mtd, addr, &ops);
223 if (err || ops.oobretlen != mtd->ecclayout->oobavail) {
224 printk(PRINT_PREF "error: readoob failed at "
225 "%#llx\n", (long long)addr);
226 errcnt += 1;
227 return err ? err : -1;
228 }
229 if (memcmp(readbuf + use_offset, writebuf, use_len)) {
230 printk(PRINT_PREF "error: verify failed at "
231 "%#llx\n", (long long)addr);
232 errcnt += 1;
233 if (errcnt > 1000) {
234 printk(PRINT_PREF "error: too many "
235 "errors\n");
236 return -1;
237 }
238 }
239 for (k = 0; k < use_offset; ++k)
240 if (readbuf[k] != 0xff) {
241 printk(PRINT_PREF "error: verify 0xff "
242 "failed at %#llx\n",
243 (long long)addr);
244 errcnt += 1;
245 if (errcnt > 1000) {
246 printk(PRINT_PREF "error: too "
247 "many errors\n");
248 return -1;
249 }
250 }
251 for (k = use_offset + use_len;
252 k < mtd->ecclayout->oobavail; ++k)
253 if (readbuf[k] != 0xff) {
254 printk(PRINT_PREF "error: verify 0xff "
255 "failed at %#llx\n",
256 (long long)addr);
257 errcnt += 1;
258 if (errcnt > 1000) {
259 printk(PRINT_PREF "error: too "
260 "many errors\n");
261 return -1;
262 }
263 }
264 }
265 if (vary_offset)
266 do_vary_offset();
267 }
268 return err;
269 }
270
verify_eraseblock_in_one_go(int ebnum)271 static int verify_eraseblock_in_one_go(int ebnum)
272 {
273 struct mtd_oob_ops ops;
274 int err = 0;
275 loff_t addr = ebnum * mtd->erasesize;
276 size_t len = mtd->ecclayout->oobavail * pgcnt;
277
278 set_random_data(writebuf, len);
279 ops.mode = MTD_OPS_AUTO_OOB;
280 ops.len = 0;
281 ops.retlen = 0;
282 ops.ooblen = len;
283 ops.oobretlen = 0;
284 ops.ooboffs = 0;
285 ops.datbuf = NULL;
286 ops.oobbuf = readbuf;
287 err = mtd_read_oob(mtd, addr, &ops);
288 if (err || ops.oobretlen != len) {
289 printk(PRINT_PREF "error: readoob failed at %#llx\n",
290 (long long)addr);
291 errcnt += 1;
292 return err ? err : -1;
293 }
294 if (memcmp(readbuf, writebuf, len)) {
295 printk(PRINT_PREF "error: verify failed at %#llx\n",
296 (long long)addr);
297 errcnt += 1;
298 if (errcnt > 1000) {
299 printk(PRINT_PREF "error: too many errors\n");
300 return -1;
301 }
302 }
303
304 return err;
305 }
306
verify_all_eraseblocks(void)307 static int verify_all_eraseblocks(void)
308 {
309 int err;
310 unsigned int i;
311
312 printk(PRINT_PREF "verifying all eraseblocks\n");
313 for (i = 0; i < ebcnt; ++i) {
314 if (bbt[i])
315 continue;
316 err = verify_eraseblock(i);
317 if (err)
318 return err;
319 if (i % 256 == 0)
320 printk(PRINT_PREF "verified up to eraseblock %u\n", i);
321 cond_resched();
322 }
323 printk(PRINT_PREF "verified %u eraseblocks\n", i);
324 return 0;
325 }
326
is_block_bad(int ebnum)327 static int is_block_bad(int ebnum)
328 {
329 int ret;
330 loff_t addr = ebnum * mtd->erasesize;
331
332 ret = mtd_block_isbad(mtd, addr);
333 if (ret)
334 printk(PRINT_PREF "block %d is bad\n", ebnum);
335 return ret;
336 }
337
scan_for_bad_eraseblocks(void)338 static int scan_for_bad_eraseblocks(void)
339 {
340 int i, bad = 0;
341
342 bbt = kmalloc(ebcnt, GFP_KERNEL);
343 if (!bbt) {
344 printk(PRINT_PREF "error: cannot allocate memory\n");
345 return -ENOMEM;
346 }
347
348 printk(PRINT_PREF "scanning for bad eraseblocks\n");
349 for (i = 0; i < ebcnt; ++i) {
350 bbt[i] = is_block_bad(i) ? 1 : 0;
351 if (bbt[i])
352 bad += 1;
353 cond_resched();
354 }
355 printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
356 return 0;
357 }
358
mtd_oobtest_init(void)359 static int __init mtd_oobtest_init(void)
360 {
361 int err = 0;
362 unsigned int i;
363 uint64_t tmp;
364 struct mtd_oob_ops ops;
365 loff_t addr = 0, addr0;
366
367 printk(KERN_INFO "\n");
368 printk(KERN_INFO "=================================================\n");
369
370 if (dev < 0) {
371 printk(PRINT_PREF "Please specify a valid mtd-device via module paramter\n");
372 printk(KERN_CRIT "CAREFUL: This test wipes all data on the specified MTD device!\n");
373 return -EINVAL;
374 }
375
376 printk(PRINT_PREF "MTD device: %d\n", dev);
377
378 mtd = get_mtd_device(NULL, dev);
379 if (IS_ERR(mtd)) {
380 err = PTR_ERR(mtd);
381 printk(PRINT_PREF "error: cannot get MTD device\n");
382 return err;
383 }
384
385 if (mtd->type != MTD_NANDFLASH) {
386 printk(PRINT_PREF "this test requires NAND flash\n");
387 goto out;
388 }
389
390 tmp = mtd->size;
391 do_div(tmp, mtd->erasesize);
392 ebcnt = tmp;
393 pgcnt = mtd->erasesize / mtd->writesize;
394
395 printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
396 "page size %u, count of eraseblocks %u, pages per "
397 "eraseblock %u, OOB size %u\n",
398 (unsigned long long)mtd->size, mtd->erasesize,
399 mtd->writesize, ebcnt, pgcnt, mtd->oobsize);
400
401 err = -ENOMEM;
402 readbuf = kmalloc(mtd->erasesize, GFP_KERNEL);
403 if (!readbuf) {
404 printk(PRINT_PREF "error: cannot allocate memory\n");
405 goto out;
406 }
407 writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
408 if (!writebuf) {
409 printk(PRINT_PREF "error: cannot allocate memory\n");
410 goto out;
411 }
412
413 err = scan_for_bad_eraseblocks();
414 if (err)
415 goto out;
416
417 use_offset = 0;
418 use_len = mtd->ecclayout->oobavail;
419 use_len_max = mtd->ecclayout->oobavail;
420 vary_offset = 0;
421
422 /* First test: write all OOB, read it back and verify */
423 printk(PRINT_PREF "test 1 of 5\n");
424
425 err = erase_whole_device();
426 if (err)
427 goto out;
428
429 simple_srand(1);
430 err = write_whole_device();
431 if (err)
432 goto out;
433
434 simple_srand(1);
435 err = verify_all_eraseblocks();
436 if (err)
437 goto out;
438
439 /*
440 * Second test: write all OOB, a block at a time, read it back and
441 * verify.
442 */
443 printk(PRINT_PREF "test 2 of 5\n");
444
445 err = erase_whole_device();
446 if (err)
447 goto out;
448
449 simple_srand(3);
450 err = write_whole_device();
451 if (err)
452 goto out;
453
454 /* Check all eraseblocks */
455 simple_srand(3);
456 printk(PRINT_PREF "verifying all eraseblocks\n");
457 for (i = 0; i < ebcnt; ++i) {
458 if (bbt[i])
459 continue;
460 err = verify_eraseblock_in_one_go(i);
461 if (err)
462 goto out;
463 if (i % 256 == 0)
464 printk(PRINT_PREF "verified up to eraseblock %u\n", i);
465 cond_resched();
466 }
467 printk(PRINT_PREF "verified %u eraseblocks\n", i);
468
469 /*
470 * Third test: write OOB at varying offsets and lengths, read it back
471 * and verify.
472 */
473 printk(PRINT_PREF "test 3 of 5\n");
474
475 err = erase_whole_device();
476 if (err)
477 goto out;
478
479 /* Write all eraseblocks */
480 use_offset = 0;
481 use_len = mtd->ecclayout->oobavail;
482 use_len_max = mtd->ecclayout->oobavail;
483 vary_offset = 1;
484 simple_srand(5);
485
486 err = write_whole_device();
487 if (err)
488 goto out;
489
490 /* Check all eraseblocks */
491 use_offset = 0;
492 use_len = mtd->ecclayout->oobavail;
493 use_len_max = mtd->ecclayout->oobavail;
494 vary_offset = 1;
495 simple_srand(5);
496 err = verify_all_eraseblocks();
497 if (err)
498 goto out;
499
500 use_offset = 0;
501 use_len = mtd->ecclayout->oobavail;
502 use_len_max = mtd->ecclayout->oobavail;
503 vary_offset = 0;
504
505 /* Fourth test: try to write off end of device */
506 printk(PRINT_PREF "test 4 of 5\n");
507
508 err = erase_whole_device();
509 if (err)
510 goto out;
511
512 addr0 = 0;
513 for (i = 0; i < ebcnt && bbt[i]; ++i)
514 addr0 += mtd->erasesize;
515
516 /* Attempt to write off end of OOB */
517 ops.mode = MTD_OPS_AUTO_OOB;
518 ops.len = 0;
519 ops.retlen = 0;
520 ops.ooblen = 1;
521 ops.oobretlen = 0;
522 ops.ooboffs = mtd->ecclayout->oobavail;
523 ops.datbuf = NULL;
524 ops.oobbuf = writebuf;
525 printk(PRINT_PREF "attempting to start write past end of OOB\n");
526 printk(PRINT_PREF "an error is expected...\n");
527 err = mtd_write_oob(mtd, addr0, &ops);
528 if (err) {
529 printk(PRINT_PREF "error occurred as expected\n");
530 err = 0;
531 } else {
532 printk(PRINT_PREF "error: can write past end of OOB\n");
533 errcnt += 1;
534 }
535
536 /* Attempt to read off end of OOB */
537 ops.mode = MTD_OPS_AUTO_OOB;
538 ops.len = 0;
539 ops.retlen = 0;
540 ops.ooblen = 1;
541 ops.oobretlen = 0;
542 ops.ooboffs = mtd->ecclayout->oobavail;
543 ops.datbuf = NULL;
544 ops.oobbuf = readbuf;
545 printk(PRINT_PREF "attempting to start read past end of OOB\n");
546 printk(PRINT_PREF "an error is expected...\n");
547 err = mtd_read_oob(mtd, addr0, &ops);
548 if (err) {
549 printk(PRINT_PREF "error occurred as expected\n");
550 err = 0;
551 } else {
552 printk(PRINT_PREF "error: can read past end of OOB\n");
553 errcnt += 1;
554 }
555
556 if (bbt[ebcnt - 1])
557 printk(PRINT_PREF "skipping end of device tests because last "
558 "block is bad\n");
559 else {
560 /* Attempt to write off end of device */
561 ops.mode = MTD_OPS_AUTO_OOB;
562 ops.len = 0;
563 ops.retlen = 0;
564 ops.ooblen = mtd->ecclayout->oobavail + 1;
565 ops.oobretlen = 0;
566 ops.ooboffs = 0;
567 ops.datbuf = NULL;
568 ops.oobbuf = writebuf;
569 printk(PRINT_PREF "attempting to write past end of device\n");
570 printk(PRINT_PREF "an error is expected...\n");
571 err = mtd_write_oob(mtd, mtd->size - mtd->writesize, &ops);
572 if (err) {
573 printk(PRINT_PREF "error occurred as expected\n");
574 err = 0;
575 } else {
576 printk(PRINT_PREF "error: wrote past end of device\n");
577 errcnt += 1;
578 }
579
580 /* Attempt to read off end of device */
581 ops.mode = MTD_OPS_AUTO_OOB;
582 ops.len = 0;
583 ops.retlen = 0;
584 ops.ooblen = mtd->ecclayout->oobavail + 1;
585 ops.oobretlen = 0;
586 ops.ooboffs = 0;
587 ops.datbuf = NULL;
588 ops.oobbuf = readbuf;
589 printk(PRINT_PREF "attempting to read past end of device\n");
590 printk(PRINT_PREF "an error is expected...\n");
591 err = mtd_read_oob(mtd, mtd->size - mtd->writesize, &ops);
592 if (err) {
593 printk(PRINT_PREF "error occurred as expected\n");
594 err = 0;
595 } else {
596 printk(PRINT_PREF "error: read past end of device\n");
597 errcnt += 1;
598 }
599
600 err = erase_eraseblock(ebcnt - 1);
601 if (err)
602 goto out;
603
604 /* Attempt to write off end of device */
605 ops.mode = MTD_OPS_AUTO_OOB;
606 ops.len = 0;
607 ops.retlen = 0;
608 ops.ooblen = mtd->ecclayout->oobavail;
609 ops.oobretlen = 0;
610 ops.ooboffs = 1;
611 ops.datbuf = NULL;
612 ops.oobbuf = writebuf;
613 printk(PRINT_PREF "attempting to write past end of device\n");
614 printk(PRINT_PREF "an error is expected...\n");
615 err = mtd_write_oob(mtd, mtd->size - mtd->writesize, &ops);
616 if (err) {
617 printk(PRINT_PREF "error occurred as expected\n");
618 err = 0;
619 } else {
620 printk(PRINT_PREF "error: wrote past end of device\n");
621 errcnt += 1;
622 }
623
624 /* Attempt to read off end of device */
625 ops.mode = MTD_OPS_AUTO_OOB;
626 ops.len = 0;
627 ops.retlen = 0;
628 ops.ooblen = mtd->ecclayout->oobavail;
629 ops.oobretlen = 0;
630 ops.ooboffs = 1;
631 ops.datbuf = NULL;
632 ops.oobbuf = readbuf;
633 printk(PRINT_PREF "attempting to read past end of device\n");
634 printk(PRINT_PREF "an error is expected...\n");
635 err = mtd_read_oob(mtd, mtd->size - mtd->writesize, &ops);
636 if (err) {
637 printk(PRINT_PREF "error occurred as expected\n");
638 err = 0;
639 } else {
640 printk(PRINT_PREF "error: read past end of device\n");
641 errcnt += 1;
642 }
643 }
644
645 /* Fifth test: write / read across block boundaries */
646 printk(PRINT_PREF "test 5 of 5\n");
647
648 /* Erase all eraseblocks */
649 err = erase_whole_device();
650 if (err)
651 goto out;
652
653 /* Write all eraseblocks */
654 simple_srand(11);
655 printk(PRINT_PREF "writing OOBs of whole device\n");
656 for (i = 0; i < ebcnt - 1; ++i) {
657 int cnt = 2;
658 int pg;
659 size_t sz = mtd->ecclayout->oobavail;
660 if (bbt[i] || bbt[i + 1])
661 continue;
662 addr = (i + 1) * mtd->erasesize - mtd->writesize;
663 for (pg = 0; pg < cnt; ++pg) {
664 set_random_data(writebuf, sz);
665 ops.mode = MTD_OPS_AUTO_OOB;
666 ops.len = 0;
667 ops.retlen = 0;
668 ops.ooblen = sz;
669 ops.oobretlen = 0;
670 ops.ooboffs = 0;
671 ops.datbuf = NULL;
672 ops.oobbuf = writebuf;
673 err = mtd_write_oob(mtd, addr, &ops);
674 if (err)
675 goto out;
676 if (i % 256 == 0)
677 printk(PRINT_PREF "written up to eraseblock "
678 "%u\n", i);
679 cond_resched();
680 addr += mtd->writesize;
681 }
682 }
683 printk(PRINT_PREF "written %u eraseblocks\n", i);
684
685 /* Check all eraseblocks */
686 simple_srand(11);
687 printk(PRINT_PREF "verifying all eraseblocks\n");
688 for (i = 0; i < ebcnt - 1; ++i) {
689 if (bbt[i] || bbt[i + 1])
690 continue;
691 set_random_data(writebuf, mtd->ecclayout->oobavail * 2);
692 addr = (i + 1) * mtd->erasesize - mtd->writesize;
693 ops.mode = MTD_OPS_AUTO_OOB;
694 ops.len = 0;
695 ops.retlen = 0;
696 ops.ooblen = mtd->ecclayout->oobavail * 2;
697 ops.oobretlen = 0;
698 ops.ooboffs = 0;
699 ops.datbuf = NULL;
700 ops.oobbuf = readbuf;
701 err = mtd_read_oob(mtd, addr, &ops);
702 if (err)
703 goto out;
704 if (memcmp(readbuf, writebuf, mtd->ecclayout->oobavail * 2)) {
705 printk(PRINT_PREF "error: verify failed at %#llx\n",
706 (long long)addr);
707 errcnt += 1;
708 if (errcnt > 1000) {
709 printk(PRINT_PREF "error: too many errors\n");
710 goto out;
711 }
712 }
713 if (i % 256 == 0)
714 printk(PRINT_PREF "verified up to eraseblock %u\n", i);
715 cond_resched();
716 }
717 printk(PRINT_PREF "verified %u eraseblocks\n", i);
718
719 printk(PRINT_PREF "finished with %d errors\n", errcnt);
720 out:
721 kfree(bbt);
722 kfree(writebuf);
723 kfree(readbuf);
724 put_mtd_device(mtd);
725 if (err)
726 printk(PRINT_PREF "error %d occurred\n", err);
727 printk(KERN_INFO "=================================================\n");
728 return err;
729 }
730 module_init(mtd_oobtest_init);
731
mtd_oobtest_exit(void)732 static void __exit mtd_oobtest_exit(void)
733 {
734 return;
735 }
736 module_exit(mtd_oobtest_exit);
737
738 MODULE_DESCRIPTION("Out-of-band test module");
739 MODULE_AUTHOR("Adrian Hunter");
740 MODULE_LICENSE("GPL");
741