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authorArnd Bergmann <arnd@arndb.de>2013-04-03 21:53:57 +0200
committerJens Axboe <axboe@kernel.dk>2013-04-03 21:53:57 +0200
commitc678ef5286ddb5cf70384ad5af286b0afc9b73e1 (patch)
tree89f63dbee90231e8fc93359eed7250ec50ebdd81 /block
parent07961ac7c0ee8b546658717034fe692fd12eefa9 (diff)
downloadlinux-linaro-stable-c678ef5286ddb5cf70384ad5af286b0afc9b73e1.tar.gz
block: avoid using uninitialized value in from queue_var_store
As found by gcc-4.8, the QUEUE_SYSFS_BIT_FNS macro creates functions that use a value generated by queue_var_store independent of whether that value was set or not. block/blk-sysfs.c: In function 'queue_store_nonrot': block/blk-sysfs.c:244:385: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized] Unlike most other such warnings, this one is not a false positive, writing any non-number string into the sysfs files indeed has an undefined result, rather than returning an error. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-sysfs.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 6206a934eb8c..5efc5a647183 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -229,6 +229,8 @@ queue_store_##name(struct request_queue *q, const char *page, size_t count) \
unsigned long val; \
ssize_t ret; \
ret = queue_var_store(&val, page, count); \
+ if (ret < 0) \
+ return ret; \
if (neg) \
val = !val; \
\