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authorSergey Senozhatsky <sergey.senozhatsky.work@gmail.com>2015-06-25 15:00:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-25 17:00:36 -0700
commit4bbacd51a683e45c13f7d6df6f85cb7391590311 (patch)
tree6226f69a81061f779f19f7af1c1e604c77d76ab5 /drivers
parent17162f41f04a3ba5a6b887a8e8e7f78159fa4a70 (diff)
zram: cut trailing newline in algorithm name
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/zram/zcomp.c2
-rw-r--r--drivers/block/zram/zram_drv.c8
2 files changed, 9 insertions, 1 deletions
diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index f1ff39a3d1c1..a1a8b8ee9fda 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -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
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index a129d52711a6..d94696b28a85 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -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;
}