From 5197c05e16b49885cc9086f1676455371e821b0e Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 9 Jan 2018 08:29:47 -0800 Subject: [PATCH] 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 Signed-off-by: Jens Axboe --- block/blk-mq.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/block/blk-mq.c b/block/blk-mq.c index bd7c47eb2923..f5e57c80a82b 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);