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| author | Ming Lei <ming.lei@canoical.com> | 2014-09-17 17:47:58 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-09-22 12:00:07 -0600 |
| commit | 2edd2c740b2918eb0a9a1fe1b69678b903769ec2 (patch) | |
| tree | 36df228ed4b404fdf1b53b966ccc914ad5555df3 | |
| parent | 0152fb6b57c4fae769ee75ea2ae670f4ff39fba9 (diff) | |
| download | linux-0-day-2edd2c740b2918eb0a9a1fe1b69678b903769ec2.tar.gz linux-0-day-2edd2c740b2918eb0a9a1fe1b69678b903769ec2.tar.xz | |
blk-mq: remove unnecessary blk_clear_rq_complete()
This patch removes two unnecessary blk_clear_rq_complete(),
the REQ_ATOM_COMPLETE flag is cleared inside blk_mq_start_request(),
so:
- The blk_clear_rq_complete() in blk_flush_restore_request()
needn't because the request will be freed later, and clearing
it here may open a small race window with timeout.
- The blk_clear_rq_complete() in blk_mq_requeue_request() isn't
necessary too, even though REQ_ATOM_STARTED is cleared in
__blk_mq_requeue_request(), in theory it still may cause a small
race window with timeout since the two clear_bit() may be
reordered.
Signed-off-by: Ming Lei <ming.lei@canoical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-flush.c | 2 | ||||
| -rw-r--r-- | block/blk-mq.c | 1 |
2 files changed, 0 insertions, 3 deletions
diff --git a/block/blk-flush.c b/block/blk-flush.c index 698e6926388c7..c8e25768f2e1a 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -126,8 +126,6 @@ static void blk_flush_restore_request(struct request *rq) /* make @rq a normal request */ rq->cmd_flags &= ~REQ_FLUSH_SEQ; rq->end_io = rq->flush.saved_end_io; - - blk_clear_rq_complete(rq); } static bool blk_flush_queue_rq(struct request *rq, bool add_front) diff --git a/block/blk-mq.c b/block/blk-mq.c index d12f1983d4937..3b277b4eaa95a 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -439,7 +439,6 @@ static void __blk_mq_requeue_request(struct request *rq) void blk_mq_requeue_request(struct request *rq) { __blk_mq_requeue_request(rq); - blk_clear_rq_complete(rq); BUG_ON(blk_queued_rq(rq)); blk_mq_add_to_requeue_list(rq, true); |