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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: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2018-01-09 08:29:47 -08:00 committed by Jens Axboe
parent 04ced159ce
commit 5197c05e16
1 changed files with 5 additions and 0 deletions
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5
block/blk-mq.c
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@ -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);