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Commit 5197c05e authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

blk-mq: protect completion path with RCU 



Currently, blk-mq protects only the issue path with RCU.  This patch
puts the completion path under the same RCU protection.  This will be
used to synchronize issue/completion against timeout by later patches,
which will also add the comments.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 04ced159

block/blk-mq.c

+5 −0
Original line number Diff line number Diff line
@@ -584,11 +584,16 @@ static void hctx_lock(struct blk_mq_hw_ctx *hctx, int *srcu_idx) 
void blk_mq_complete_request(struct request *rq)

{

	struct request_queue *q = rq->q;

	struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, rq->mq_ctx->cpu);

	int srcu_idx;



	if (unlikely(blk_should_fake_timeout(q)))

		return;



	hctx_lock(hctx, &srcu_idx);

	if (!blk_mark_rq_complete(rq))

		__blk_mq_complete_request(rq);

	hctx_unlock(hctx, srcu_idx);

}

EXPORT_SYMBOL(blk_mq_complete_request);