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zram: cut trailing newline in algorithm name

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Supplied sysfs values sometimes contain new-line symbols (echo vs.  echo
-n), which we also copy as a compression algorithm name.  it works fine
when we lookup for compression algorithm, because we use sysfs_streq()
which takes care of new line symbols.  however, it doesn't look nice when
we print compression algorithm name if zcomp_create() failed:

 zram: Cannot initialise LXZ
            compressing backend

cut trailing new-line, so the error string will look like

  zram: Cannot initialise LXZ compressing backend

we also now can replace sysfs_streq() in zcomp_available_show() with
strcmp().

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2015-06-25 15:00:29 -07:00 committed by Linus Torvalds
parent 17162f41f0
commit 4bbacd51a6
2 changed files with 9 additions and 1 deletions
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2
drivers/block/zram/zcomp.c
View file

@ -274,7 +274,7 @@ ssize_t zcomp_available_show(const char *comp, char *buf)
int i = 0;
while (backends[i]) {
if (sysfs_streq(comp, backends[i]->name))
if (!strcmp(comp, backends[i]->name))
sz += scnprintf(buf + sz, PAGE_SIZE - sz - 2,
"[%s] ", backends[i]->name);
else

8
drivers/block/zram/zram_drv.c
View file

@ -363,6 +363,8 @@ static ssize_t comp_algorithm_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct zram *zram = dev_to_zram(dev);
size_t sz;
down_write(&zram->init_lock);
if (init_done(zram)) {
up_write(&zram->init_lock);
@ -370,6 +372,12 @@ static ssize_t comp_algorithm_store(struct device *dev,
return -EBUSY;
}
strlcpy(zram->compressor, buf, sizeof(zram->compressor));
/* ignore trailing newline */
sz = strlen(zram->compressor);
if (sz > 0 && zram->compressor[sz - 1] == '\n')
zram->compressor[sz - 1] = 0x00;
up_write(&zram->init_lock);
return len;
}