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dma-debug: track bucket lock state for static checkers

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get_hash_bucket() and put_hash_bucket() acquire and release the same
spinlock, but this confuses static checkers such as sparse

  lib/dma-debug.c:254:27: warning: context imbalance in 'get_hash_bucket' - wrong count at exit
  lib/dma-debug.c:268:13: warning: context imbalance in 'put_hash_bucket' - unexpected unlock

Add the appropriate acquire and release statements so that checkers can
properly track the lock state.

Link: http://lkml.kernel.org/r/20160701191552.24295-1-sboyd@codeaurora.org
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stephen Boyd 2016-07-26 15:21:08 -07:00 • committed by Linus Torvalds
parent 6b524995a7
commit d5dfc80f80
1 changed files with 2 additions and 0 deletions
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2
lib/dma-debug.c
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@ -253,6 +253,7 @@ static int hash_fn(struct dma_debug_entry *entry)
*/
static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
unsigned long *flags)
__acquires(&dma_entry_hash[idx].lock)
{
int idx = hash_fn(entry);
unsigned long __flags;
@ -267,6 +268,7 @@ static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
*/
static void put_hash_bucket(struct hash_bucket *bucket,
unsigned long *flags)
__releases(&bucket->lock)
{
unsigned long __flags = *flags;