From: Ming Lei <ming....@canoical.com>
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....@canoical.com>
---
block/blk-flush.c | 2 --
block/blk-mq.c | 1 -
2 files changed, 3 deletions(-)
diff --git a/block/blk-flush.c b/block/blk-flush.c
index b439670..db6dfb4 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -127,8 +127,6 @@ 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 957815e..6e4942d 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -430,7 +430,6 @@ 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);
--
1.7.9.5
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