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authorBart Van Assche <bart.vanassche@sandisk.com>2017-06-20 11:15:45 -0700
committerJens Axboe <axboe@kernel.dk>2017-06-20 19:27:14 -0600
commit2fff8a924d4c614b5a17b2a236a2cf09aa51af5f (patch)
tree46f7b27ff3593ddeabaadd0032e5449825995fde /block/blk-flush.c
parent9e0c829906b9aa1e7ad84689f2bcd56457bdb417 (diff)
downloadlinux-0-day-2fff8a924d4c614b5a17b2a236a2cf09aa51af5f.tar.gz
block: Check locking assumptions at runtime
Instead of documenting the locking assumptions of most block layer functions as a comment, use lockdep_assert_held() to verify locking assumptions at runtime. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Cc: Omar Sandoval <osandov@fb.com> Cc: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-flush.c')
-rw-r--r--block/blk-flush.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/block/blk-flush.c b/block/blk-flush.c
index a572b47..ed5fe32 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -346,6 +346,8 @@ static void flush_data_end_io(struct request *rq, blk_status_t error)
struct request_queue *q = rq->q;
struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL);
+ lockdep_assert_held(q->queue_lock);
+
/*
* Updating q->in_flight[] here for making this tag usable
* early. Because in blk_queue_start_tag(),
@@ -411,9 +413,6 @@ static void mq_flush_data_end_io(struct request *rq, blk_status_t error)
* or __blk_mq_run_hw_queue() to dispatch request.
* @rq is being submitted. Analyze what needs to be done and put it on the
* right queue.
- *
- * CONTEXT:
- * spin_lock_irq(q->queue_lock) in !mq case
*/
void blk_insert_flush(struct request *rq)
{
@@ -422,6 +421,9 @@ void blk_insert_flush(struct request *rq)
unsigned int policy = blk_flush_policy(fflags, rq);
struct blk_flush_queue *fq = blk_get_flush_queue(q, rq->mq_ctx);
+ if (!q->mq_ops)
+ lockdep_assert_held(q->queue_lock);
+
/*
* @policy now records what operations need to be done. Adjust
* REQ_PREFLUSH and FUA for the driver.