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blk-mq: Add locking annotations to hctx_lock() and hctx_unlock() 

This patch avoids that sparse reports the following:

block/blk-mq.c:637:33: warning: context imbalance in 'hctx_unlock' - unexpected unlock
block/blk-mq.c:642:9: warning: context imbalance in 'hctx_lock' - wrong count at exit

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2018-01-10 11:34:27 -08:00 committed by Jens Axboe
parent 0478fe6868
commit b7435db8b8
1 changed files with 2 additions and 0 deletions
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2
block/blk-mq.c
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@ -559,6 +559,7 @@ static void __blk_mq_complete_request(struct request *rq)
}
static void hctx_unlock(struct blk_mq_hw_ctx *hctx, int srcu_idx)
__releases(hctx->srcu)
{
if (!(hctx->flags & BLK_MQ_F_BLOCKING))
rcu_read_unlock();
@ -567,6 +568,7 @@ static void hctx_unlock(struct blk_mq_hw_ctx *hctx, int srcu_idx)
}
static void hctx_lock(struct blk_mq_hw_ctx *hctx, int *srcu_idx)
__acquires(hctx->srcu)
{
if (!(hctx->flags & BLK_MQ_F_BLOCKING)) {
/* shut up gcc false positive */