dma-debug: track bucket lock state for static checkers
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>
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 51a76af..fcfa193 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -253,6 +253,7 @@
*/
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 void put_hash_bucket(struct hash_bucket *bucket,
unsigned long *flags)
+ __releases(&bucket->lock)
{
unsigned long __flags = *flags;