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@xxxxxxxxxx>
---
block/blk-mq.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index ddc9261..6741c3e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -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);
--
2.9.5
