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authorAkinobu Mita <akinobu.mita@gmail.com>2013-02-27 17:05:35 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-27 19:10:22 -0800
commit825b8ccb7450c805da7055a33fde032f2f0ed3ae (patch)
tree6e631d031537639303391271da24451172f087de /drivers/mtd
parent8dad049884e6d09aec5859c5bff5d2c36ea621a7 (diff)
mtd: mtd_pagetest: convert to use prandom library
This removes home-brewed pseudo-random number generator and use prandom library. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Artem Bityutskiy <dedekind1@gmail.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Laight <david.laight@aculab.com> Cc: Eilon Greenstein <eilong@broadcom.com> Cc: Michel Lespinasse <walken@google.com> Cc: Robert Love <robert.w.love@intel.com> Cc: Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/tests/mtd_pagetest.c43
1 files changed, 13 insertions, 30 deletions
diff --git a/drivers/mtd/tests/mtd_pagetest.c b/drivers/mtd/tests/mtd_pagetest.c
index f93a76f88113..0c1140b6c286 100644
--- a/drivers/mtd/tests/mtd_pagetest.c
+++ b/drivers/mtd/tests/mtd_pagetest.c
@@ -29,6 +29,7 @@
#include <linux/mtd/mtd.h>
#include <linux/slab.h>
#include <linux/sched.h>
+#include <linux/random.h>
static int dev = -EINVAL;
module_param(dev, int, S_IRUGO);
@@ -45,26 +46,7 @@ static int bufsize;
static int ebcnt;
static int pgcnt;
static int errcnt;
-static unsigned long next = 1;
-
-static inline unsigned int simple_rand(void)
-{
- next = next * 1103515245 + 12345;
- return (unsigned int)((next / 65536) % 32768);
-}
-
-static inline void simple_srand(unsigned long seed)
-{
- next = seed;
-}
-
-static void set_random_data(unsigned char *buf, size_t len)
-{
- size_t i;
-
- for (i = 0; i < len; ++i)
- buf[i] = simple_rand();
-}
+static struct rnd_state rnd_state;
static int erase_eraseblock(int ebnum)
{
@@ -98,7 +80,7 @@ static int write_eraseblock(int ebnum)
size_t written;
loff_t addr = ebnum * mtd->erasesize;
- set_random_data(writebuf, mtd->erasesize);
+ prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
cond_resched();
err = mtd_write(mtd, addr, mtd->erasesize, &written, writebuf);
if (err || written != mtd->erasesize)
@@ -124,7 +106,7 @@ static int verify_eraseblock(int ebnum)
for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
addrn -= mtd->erasesize;
- set_random_data(writebuf, mtd->erasesize);
+ prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) {
/* Do a read to set the internal dataRAMs to different data */
err = mtd_read(mtd, addr0, bufsize, &read, twopages);
@@ -160,7 +142,8 @@ static int verify_eraseblock(int ebnum)
}
/* Check boundary between eraseblocks */
if (addr <= addrn - pgsize - pgsize && !bbt[ebnum + 1]) {
- unsigned long oldnext = next;
+ struct rnd_state old_state = rnd_state;
+
/* Do a read to set the internal dataRAMs to different data */
err = mtd_read(mtd, addr0, bufsize, &read, twopages);
if (mtd_is_bitflip(err))
@@ -188,13 +171,13 @@ static int verify_eraseblock(int ebnum)
return err;
}
memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize);
- set_random_data(boundary + pgsize, pgsize);
+ prandom_bytes_state(&rnd_state, boundary + pgsize, pgsize);
if (memcmp(twopages, boundary, bufsize)) {
pr_err("error: verify failed at %#llx\n",
(long long)addr);
errcnt += 1;
}
- next = oldnext;
+ rnd_state = old_state;
}
return err;
}
@@ -326,7 +309,7 @@ static int erasecrosstest(void)
return err;
pr_info("writing 1st page of block %d\n", ebnum);
- set_random_data(writebuf, pgsize);
+ prandom_bytes_state(&rnd_state, writebuf, pgsize);
strcpy(writebuf, "There is no data like this!");
err = mtd_write(mtd, addr0, pgsize, &written, writebuf);
if (err || written != pgsize) {
@@ -359,7 +342,7 @@ static int erasecrosstest(void)
return err;
pr_info("writing 1st page of block %d\n", ebnum);
- set_random_data(writebuf, pgsize);
+ prandom_bytes_state(&rnd_state, writebuf, pgsize);
strcpy(writebuf, "There is no data like this!");
err = mtd_write(mtd, addr0, pgsize, &written, writebuf);
if (err || written != pgsize) {
@@ -417,7 +400,7 @@ static int erasetest(void)
return err;
pr_info("writing 1st page of block %d\n", ebnum);
- set_random_data(writebuf, pgsize);
+ prandom_bytes_state(&rnd_state, writebuf, pgsize);
err = mtd_write(mtd, addr0, pgsize, &written, writebuf);
if (err || written != pgsize) {
pr_err("error: write failed at %#llx\n",
@@ -565,7 +548,7 @@ static int __init mtd_pagetest_init(void)
pr_info("erased %u eraseblocks\n", i);
/* Write all eraseblocks */
- simple_srand(1);
+ prandom_seed_state(&rnd_state, 1);
pr_info("writing whole device\n");
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
@@ -580,7 +563,7 @@ static int __init mtd_pagetest_init(void)
pr_info("written %u eraseblocks\n", i);
/* Check all eraseblocks */
- simple_srand(1);
+ prandom_seed_state(&rnd_state, 1);
pr_info("verifying all eraseblocks\n");
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])