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/sched.h>
29
30 #define PRINT_PREF KERN_INFO "mtd_oobtest: "
31
32 static int dev;
33 module_param(dev, int, S_IRUGO);
34 MODULE_PARM_DESC(dev, "MTD device number to use");
35
36 static struct mtd_info *mtd;
37 static unsigned char *readbuf;
38 static unsigned char *writebuf;
39 static unsigned char *bbt;
40
41 static int ebcnt;
42 static int pgcnt;
43 static int errcnt;
44 static int use_offset;
45 static int use_len;
46 static int use_len_max;
47 static int vary_offset;
48 static unsigned long next = 1;
49
simple_rand(void)50 static inline unsigned int simple_rand(void)
51 {
52 next = next * 1103515245 + 12345;
53 return (unsigned int)((next / 65536) % 32768);
54 }
55
simple_srand(unsigned long seed)56 static inline void simple_srand(unsigned long seed)
57 {
58 next = seed;
59 }
60
set_random_data(unsigned char * buf,size_t len)61 static void set_random_data(unsigned char *buf, size_t len)
62 {
63 size_t i;
64
65 for (i = 0; i < len; ++i)
66 buf[i] = simple_rand();
67 }
68
erase_eraseblock(int ebnum)69 static int erase_eraseblock(int ebnum)
70 {
71 int err;
72 struct erase_info ei;
73 loff_t addr = ebnum * mtd->erasesize;
74
75 memset(&ei, 0, sizeof(struct erase_info));
76 ei.mtd = mtd;
77 ei.addr = addr;
78 ei.len = mtd->erasesize;
79
80 err = mtd->erase(mtd, &ei);
81 if (err) {
82 printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
83 return err;
84 }
85
86 if (ei.state == MTD_ERASE_FAILED) {
87 printk(PRINT_PREF "some erase error occurred at EB %d\n",
88 ebnum);
89 return -EIO;
90 }
91
92 return 0;
93 }
94
erase_whole_device(void)95 static int erase_whole_device(void)
96 {
97 int err;
98 unsigned int i;
99
100 printk(PRINT_PREF "erasing whole device\n");
101 for (i = 0; i < ebcnt; ++i) {
102 if (bbt[i])
103 continue;
104 err = erase_eraseblock(i);
105 if (err)
106 return err;
107 cond_resched();
108 }
109 printk(PRINT_PREF "erased %u eraseblocks\n", i);
110 return 0;
111 }
112
do_vary_offset(void)113 static void do_vary_offset(void)
114 {
115 use_len -= 1;
116 if (use_len < 1) {
117 use_offset += 1;
118 if (use_offset >= use_len_max)
119 use_offset = 0;
120 use_len = use_len_max - use_offset;
121 }
122 }
123
write_eraseblock(int ebnum)124 static int write_eraseblock(int ebnum)
125 {
126 int i;
127 struct mtd_oob_ops ops;
128 int err = 0;
129 loff_t addr = ebnum * mtd->erasesize;
130
131 for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
132 set_random_data(writebuf, use_len);
133 ops.mode = MTD_OOB_AUTO;
134 ops.len = 0;
135 ops.retlen = 0;
136 ops.ooblen = use_len;
137 ops.oobretlen = 0;
138 ops.ooboffs = use_offset;
139 ops.datbuf = 0;
140 ops.oobbuf = writebuf;
141 err = mtd->write_oob(mtd, addr, &ops);
142 if (err || ops.oobretlen != use_len) {
143 printk(PRINT_PREF "error: writeoob failed at %#llx\n",
144 (long long)addr);
145 printk(PRINT_PREF "error: use_len %d, use_offset %d\n",
146 use_len, use_offset);
147 errcnt += 1;
148 return err ? err : -1;
149 }
150 if (vary_offset)
151 do_vary_offset();
152 }
153
154 return err;
155 }
156
write_whole_device(void)157 static int write_whole_device(void)
158 {
159 int err;
160 unsigned int i;
161
162 printk(PRINT_PREF "writing OOBs of whole device\n");
163 for (i = 0; i < ebcnt; ++i) {
164 if (bbt[i])
165 continue;
166 err = write_eraseblock(i);
167 if (err)
168 return err;
169 if (i % 256 == 0)
170 printk(PRINT_PREF "written up to eraseblock %u\n", i);
171 cond_resched();
172 }
173 printk(PRINT_PREF "written %u eraseblocks\n", i);
174 return 0;
175 }
176
verify_eraseblock(int ebnum)177 static int verify_eraseblock(int ebnum)
178 {
179 int i;
180 struct mtd_oob_ops ops;
181 int err = 0;
182 loff_t addr = ebnum * mtd->erasesize;
183
184 for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
185 set_random_data(writebuf, use_len);
186 ops.mode = MTD_OOB_AUTO;
187 ops.len = 0;
188 ops.retlen = 0;
189 ops.ooblen = use_len;
190 ops.oobretlen = 0;
191 ops.ooboffs = use_offset;
192 ops.datbuf = 0;
193 ops.oobbuf = readbuf;
194 err = mtd->read_oob(mtd, addr, &ops);
195 if (err || ops.oobretlen != use_len) {
196 printk(PRINT_PREF "error: readoob failed at %#llx\n",
197 (long long)addr);
198 errcnt += 1;
199 return err ? err : -1;
200 }
201 if (memcmp(readbuf, writebuf, use_len)) {
202 printk(PRINT_PREF "error: verify failed at %#llx\n",
203 (long long)addr);
204 errcnt += 1;
205 if (errcnt > 1000) {
206 printk(PRINT_PREF "error: too many errors\n");
207 return -1;
208 }
209 }
210 if (use_offset != 0 || use_len < mtd->ecclayout->oobavail) {
211 int k;
212
213 ops.mode = MTD_OOB_AUTO;
214 ops.len = 0;
215 ops.retlen = 0;
216 ops.ooblen = mtd->ecclayout->oobavail;
217 ops.oobretlen = 0;
218 ops.ooboffs = 0;
219 ops.datbuf = 0;
220 ops.oobbuf = readbuf;
221 err = mtd->read_oob(mtd, addr, &ops);
222 if (err || ops.oobretlen != mtd->ecclayout->oobavail) {
223 printk(PRINT_PREF "error: readoob failed at "
224 "%#llx\n", (long long)addr);
225 errcnt += 1;
226 return err ? err : -1;
227 }
228 if (memcmp(readbuf + use_offset, writebuf, use_len)) {
229 printk(PRINT_PREF "error: verify failed at "
230 "%#llx\n", (long long)addr);
231 errcnt += 1;
232 if (errcnt > 1000) {
233 printk(PRINT_PREF "error: too many "
234 "errors\n");
235 return -1;
236 }
237 }
238 for (k = 0; k < use_offset; ++k)
239 if (readbuf[k] != 0xff) {
240 printk(PRINT_PREF "error: verify 0xff "
241 "failed at %#llx\n",
242 (long long)addr);
243 errcnt += 1;
244 if (errcnt > 1000) {
245 printk(PRINT_PREF "error: too "
246 "many errors\n");
247 return -1;
248 }
249 }
250 for (k = use_offset + use_len;
251 k < mtd->ecclayout->oobavail; ++k)
252 if (readbuf[k] != 0xff) {
253 printk(PRINT_PREF "error: verify 0xff "
254 "failed at %#llx\n",
255 (long long)addr);
256 errcnt += 1;
257 if (errcnt > 1000) {
258 printk(PRINT_PREF "error: too "
259 "many errors\n");
260 return -1;
261 }
262 }
263 }
264 if (vary_offset)
265 do_vary_offset();
266 }
267 return err;
268 }
269
verify_eraseblock_in_one_go(int ebnum)270 static int verify_eraseblock_in_one_go(int ebnum)
271 {
272 struct mtd_oob_ops ops;
273 int err = 0;
274 loff_t addr = ebnum * mtd->erasesize;
275 size_t len = mtd->ecclayout->oobavail * pgcnt;
276
277 set_random_data(writebuf, len);
278 ops.mode = MTD_OOB_AUTO;
279 ops.len = 0;
280 ops.retlen = 0;
281 ops.ooblen = len;
282 ops.oobretlen = 0;
283 ops.ooboffs = 0;
284 ops.datbuf = 0;
285 ops.oobbuf = readbuf;
286 err = mtd->read_oob(mtd, addr, &ops);
287 if (err || ops.oobretlen != len) {
288 printk(PRINT_PREF "error: readoob failed at %#llx\n",
289 (long long)addr);
290 errcnt += 1;
291 return err ? err : -1;
292 }
293 if (memcmp(readbuf, writebuf, len)) {
294 printk(PRINT_PREF "error: verify failed at %#llx\n",
295 (long long)addr);
296 errcnt += 1;
297 if (errcnt > 1000) {
298 printk(PRINT_PREF "error: too many errors\n");
299 return -1;
300 }
301 }
302
303 return err;
304 }
305
verify_all_eraseblocks(void)306 static int verify_all_eraseblocks(void)
307 {
308 int err;
309 unsigned int i;
310
311 printk(PRINT_PREF "verifying all eraseblocks\n");
312 for (i = 0; i < ebcnt; ++i) {
313 if (bbt[i])
314 continue;
315 err = verify_eraseblock(i);
316 if (err)
317 return err;
318 if (i % 256 == 0)
319 printk(PRINT_PREF "verified up to eraseblock %u\n", i);
320 cond_resched();
321 }
322 printk(PRINT_PREF "verified %u eraseblocks\n", i);
323 return 0;
324 }
325
is_block_bad(int ebnum)326 static int is_block_bad(int ebnum)
327 {
328 int ret;
329 loff_t addr = ebnum * mtd->erasesize;
330
331 ret = mtd->block_isbad(mtd, addr);
332 if (ret)
333 printk(PRINT_PREF "block %d is bad\n", ebnum);
334 return ret;
335 }
336
scan_for_bad_eraseblocks(void)337 static int scan_for_bad_eraseblocks(void)
338 {
339 int i, bad = 0;
340
341 bbt = kmalloc(ebcnt, GFP_KERNEL);
342 if (!bbt) {
343 printk(PRINT_PREF "error: cannot allocate memory\n");
344 return -ENOMEM;
345 }
346 memset(bbt, 0 , ebcnt);
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 printk(PRINT_PREF "MTD device: %d\n", dev);
370
371 mtd = get_mtd_device(NULL, dev);
372 if (IS_ERR(mtd)) {
373 err = PTR_ERR(mtd);
374 printk(PRINT_PREF "error: cannot get MTD device\n");
375 return err;
376 }
377
378 if (mtd->type != MTD_NANDFLASH) {
379 printk(PRINT_PREF "this test requires NAND flash\n");
380 goto out;
381 }
382
383 tmp = mtd->size;
384 do_div(tmp, mtd->erasesize);
385 ebcnt = tmp;
386 pgcnt = mtd->erasesize / mtd->writesize;
387
388 printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
389 "page size %u, count of eraseblocks %u, pages per "
390 "eraseblock %u, OOB size %u\n",
391 (unsigned long long)mtd->size, mtd->erasesize,
392 mtd->writesize, ebcnt, pgcnt, mtd->oobsize);
393
394 err = -ENOMEM;
395 mtd->erasesize = mtd->erasesize;
396 readbuf = kmalloc(mtd->erasesize, GFP_KERNEL);
397 if (!readbuf) {
398 printk(PRINT_PREF "error: cannot allocate memory\n");
399 goto out;
400 }
401 writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
402 if (!writebuf) {
403 printk(PRINT_PREF "error: cannot allocate memory\n");
404 goto out;
405 }
406
407 err = scan_for_bad_eraseblocks();
408 if (err)
409 goto out;
410
411 use_offset = 0;
412 use_len = mtd->ecclayout->oobavail;
413 use_len_max = mtd->ecclayout->oobavail;
414 vary_offset = 0;
415
416 /* First test: write all OOB, read it back and verify */
417 printk(PRINT_PREF "test 1 of 5\n");
418
419 err = erase_whole_device();
420 if (err)
421 goto out;
422
423 simple_srand(1);
424 err = write_whole_device();
425 if (err)
426 goto out;
427
428 simple_srand(1);
429 err = verify_all_eraseblocks();
430 if (err)
431 goto out;
432
433 /*
434 * Second test: write all OOB, a block at a time, read it back and
435 * verify.
436 */
437 printk(PRINT_PREF "test 2 of 5\n");
438
439 err = erase_whole_device();
440 if (err)
441 goto out;
442
443 simple_srand(3);
444 err = write_whole_device();
445 if (err)
446 goto out;
447
448 /* Check all eraseblocks */
449 simple_srand(3);
450 printk(PRINT_PREF "verifying all eraseblocks\n");
451 for (i = 0; i < ebcnt; ++i) {
452 if (bbt[i])
453 continue;
454 err = verify_eraseblock_in_one_go(i);
455 if (err)
456 goto out;
457 if (i % 256 == 0)
458 printk(PRINT_PREF "verified up to eraseblock %u\n", i);
459 cond_resched();
460 }
461 printk(PRINT_PREF "verified %u eraseblocks\n", i);
462
463 /*
464 * Third test: write OOB at varying offsets and lengths, read it back
465 * and verify.
466 */
467 printk(PRINT_PREF "test 3 of 5\n");
468
469 err = erase_whole_device();
470 if (err)
471 goto out;
472
473 /* Write all eraseblocks */
474 use_offset = 0;
475 use_len = mtd->ecclayout->oobavail;
476 use_len_max = mtd->ecclayout->oobavail;
477 vary_offset = 1;
478 simple_srand(5);
479 printk(PRINT_PREF "writing OOBs of whole device\n");
480 for (i = 0; i < ebcnt; ++i) {
481 if (bbt[i])
482 continue;
483 err = write_eraseblock(i);
484 if (err)
485 goto out;
486 if (i % 256 == 0)
487 printk(PRINT_PREF "written up to eraseblock %u\n", i);
488 cond_resched();
489 }
490 printk(PRINT_PREF "written %u eraseblocks\n", i);
491
492 /* Check all eraseblocks */
493 use_offset = 0;
494 use_len = mtd->ecclayout->oobavail;
495 use_len_max = mtd->ecclayout->oobavail;
496 vary_offset = 1;
497 simple_srand(5);
498 err = verify_all_eraseblocks();
499 if (err)
500 goto out;
501
502 use_offset = 0;
503 use_len = mtd->ecclayout->oobavail;
504 use_len_max = mtd->ecclayout->oobavail;
505 vary_offset = 0;
506
507 /* Fourth test: try to write off end of device */
508 printk(PRINT_PREF "test 4 of 5\n");
509
510 err = erase_whole_device();
511 if (err)
512 goto out;
513
514 addr0 = 0;
515 for (i = 0; bbt[i] && i < ebcnt; ++i)
516 addr0 += mtd->erasesize;
517
518 /* Attempt to write off end of OOB */
519 ops.mode = MTD_OOB_AUTO;
520 ops.len = 0;
521 ops.retlen = 0;
522 ops.ooblen = 1;
523 ops.oobretlen = 0;
524 ops.ooboffs = mtd->ecclayout->oobavail;
525 ops.datbuf = 0;
526 ops.oobbuf = writebuf;
527 printk(PRINT_PREF "attempting to start write past end of OOB\n");
528 printk(PRINT_PREF "an error is expected...\n");
529 err = mtd->write_oob(mtd, addr0, &ops);
530 if (err) {
531 printk(PRINT_PREF "error occurred as expected\n");
532 err = 0;
533 } else {
534 printk(PRINT_PREF "error: can write past end of OOB\n");
535 errcnt += 1;
536 }
537
538 /* Attempt to read off end of OOB */
539 ops.mode = MTD_OOB_AUTO;
540 ops.len = 0;
541 ops.retlen = 0;
542 ops.ooblen = 1;
543 ops.oobretlen = 0;
544 ops.ooboffs = mtd->ecclayout->oobavail;
545 ops.datbuf = 0;
546 ops.oobbuf = readbuf;
547 printk(PRINT_PREF "attempting to start read past end of OOB\n");
548 printk(PRINT_PREF "an error is expected...\n");
549 err = mtd->read_oob(mtd, addr0, &ops);
550 if (err) {
551 printk(PRINT_PREF "error occurred as expected\n");
552 err = 0;
553 } else {
554 printk(PRINT_PREF "error: can read past end of OOB\n");
555 errcnt += 1;
556 }
557
558 if (bbt[ebcnt - 1])
559 printk(PRINT_PREF "skipping end of device tests because last "
560 "block is bad\n");
561 else {
562 /* Attempt to write off end of device */
563 ops.mode = MTD_OOB_AUTO;
564 ops.len = 0;
565 ops.retlen = 0;
566 ops.ooblen = mtd->ecclayout->oobavail + 1;
567 ops.oobretlen = 0;
568 ops.ooboffs = 0;
569 ops.datbuf = 0;
570 ops.oobbuf = writebuf;
571 printk(PRINT_PREF "attempting to write past end of device\n");
572 printk(PRINT_PREF "an error is expected...\n");
573 err = mtd->write_oob(mtd, mtd->size - mtd->writesize, &ops);
574 if (err) {
575 printk(PRINT_PREF "error occurred as expected\n");
576 err = 0;
577 } else {
578 printk(PRINT_PREF "error: wrote past end of device\n");
579 errcnt += 1;
580 }
581
582 /* Attempt to read off end of device */
583 ops.mode = MTD_OOB_AUTO;
584 ops.len = 0;
585 ops.retlen = 0;
586 ops.ooblen = mtd->ecclayout->oobavail + 1;
587 ops.oobretlen = 0;
588 ops.ooboffs = 0;
589 ops.datbuf = 0;
590 ops.oobbuf = readbuf;
591 printk(PRINT_PREF "attempting to read past end of device\n");
592 printk(PRINT_PREF "an error is expected...\n");
593 err = mtd->read_oob(mtd, mtd->size - mtd->writesize, &ops);
594 if (err) {
595 printk(PRINT_PREF "error occurred as expected\n");
596 err = 0;
597 } else {
598 printk(PRINT_PREF "error: read past end of device\n");
599 errcnt += 1;
600 }
601
602 err = erase_eraseblock(ebcnt - 1);
603 if (err)
604 goto out;
605
606 /* Attempt to write off end of device */
607 ops.mode = MTD_OOB_AUTO;
608 ops.len = 0;
609 ops.retlen = 0;
610 ops.ooblen = mtd->ecclayout->oobavail;
611 ops.oobretlen = 0;
612 ops.ooboffs = 1;
613 ops.datbuf = 0;
614 ops.oobbuf = writebuf;
615 printk(PRINT_PREF "attempting to write past end of device\n");
616 printk(PRINT_PREF "an error is expected...\n");
617 err = mtd->write_oob(mtd, mtd->size - mtd->writesize, &ops);
618 if (err) {
619 printk(PRINT_PREF "error occurred as expected\n");
620 err = 0;
621 } else {
622 printk(PRINT_PREF "error: wrote past end of device\n");
623 errcnt += 1;
624 }
625
626 /* Attempt to read off end of device */
627 ops.mode = MTD_OOB_AUTO;
628 ops.len = 0;
629 ops.retlen = 0;
630 ops.ooblen = mtd->ecclayout->oobavail;
631 ops.oobretlen = 0;
632 ops.ooboffs = 1;
633 ops.datbuf = 0;
634 ops.oobbuf = readbuf;
635 printk(PRINT_PREF "attempting to read past end of device\n");
636 printk(PRINT_PREF "an error is expected...\n");
637 err = mtd->read_oob(mtd, mtd->size - mtd->writesize, &ops);
638 if (err) {
639 printk(PRINT_PREF "error occurred as expected\n");
640 err = 0;
641 } else {
642 printk(PRINT_PREF "error: read past end of device\n");
643 errcnt += 1;
644 }
645 }
646
647 /* Fifth test: write / read across block boundaries */
648 printk(PRINT_PREF "test 5 of 5\n");
649
650 /* Erase all eraseblocks */
651 err = erase_whole_device();
652 if (err)
653 goto out;
654
655 /* Write all eraseblocks */
656 simple_srand(11);
657 printk(PRINT_PREF "writing OOBs of whole device\n");
658 for (i = 0; i < ebcnt - 1; ++i) {
659 int cnt = 2;
660 int pg;
661 size_t sz = mtd->ecclayout->oobavail;
662 if (bbt[i] || bbt[i + 1])
663 continue;
664 addr = (i + 1) * mtd->erasesize - mtd->writesize;
665 for (pg = 0; pg < cnt; ++pg) {
666 set_random_data(writebuf, sz);
667 ops.mode = MTD_OOB_AUTO;
668 ops.len = 0;
669 ops.retlen = 0;
670 ops.ooblen = sz;
671 ops.oobretlen = 0;
672 ops.ooboffs = 0;
673 ops.datbuf = 0;
674 ops.oobbuf = writebuf;
675 err = mtd->write_oob(mtd, addr, &ops);
676 if (err)
677 goto out;
678 if (i % 256 == 0)
679 printk(PRINT_PREF "written up to eraseblock "
680 "%u\n", i);
681 cond_resched();
682 addr += mtd->writesize;
683 }
684 }
685 printk(PRINT_PREF "written %u eraseblocks\n", i);
686
687 /* Check all eraseblocks */
688 simple_srand(11);
689 printk(PRINT_PREF "verifying all eraseblocks\n");
690 for (i = 0; i < ebcnt - 1; ++i) {
691 if (bbt[i] || bbt[i + 1])
692 continue;
693 set_random_data(writebuf, mtd->ecclayout->oobavail * 2);
694 addr = (i + 1) * mtd->erasesize - mtd->writesize;
695 ops.mode = MTD_OOB_AUTO;
696 ops.len = 0;
697 ops.retlen = 0;
698 ops.ooblen = mtd->ecclayout->oobavail * 2;
699 ops.oobretlen = 0;
700 ops.ooboffs = 0;
701 ops.datbuf = 0;
702 ops.oobbuf = readbuf;
703 err = mtd->read_oob(mtd, addr, &ops);
704 if (err)
705 goto out;
706 if (memcmp(readbuf, writebuf, mtd->ecclayout->oobavail * 2)) {
707 printk(PRINT_PREF "error: verify failed at %#llx\n",
708 (long long)addr);
709 errcnt += 1;
710 if (errcnt > 1000) {
711 printk(PRINT_PREF "error: too many errors\n");
712 goto out;
713 }
714 }
715 if (i % 256 == 0)
716 printk(PRINT_PREF "verified up to eraseblock %u\n", i);
717 cond_resched();
718 }
719 printk(PRINT_PREF "verified %u eraseblocks\n", i);
720
721 printk(PRINT_PREF "finished with %d errors\n", errcnt);
722 out:
723 kfree(bbt);
724 kfree(writebuf);
725 kfree(readbuf);
726 put_mtd_device(mtd);
727 if (err)
728 printk(PRINT_PREF "error %d occurred\n", err);
729 printk(KERN_INFO "=================================================\n");
730 return err;
731 }
732 module_init(mtd_oobtest_init);
733
mtd_oobtest_exit(void)734 static void __exit mtd_oobtest_exit(void)
735 {
736 return;
737 }
738 module_exit(mtd_oobtest_exit);
739
740 MODULE_DESCRIPTION("Out-of-band test module");
741 MODULE_AUTHOR("Adrian Hunter");
742 MODULE_LICENSE("GPL");
743