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Date:   Mon, 18 Feb 2019 14:43:09 +0100
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Florian Stecker <>,
        Jianchao Wang <>,
        Jens Axboe <>, Sasha Levin <>
Subject: [PATCH 4.14 03/62] blk-mq: fix a hung issue when fsync

4.14-stable review patch.  If anyone has any objections, please let me know.


[ Upstream commit 85bd6e61f34dffa8ec2dc75ff3c02ee7b2f1cbce ]

Florian reported a io hung issue when fsync(). It should be
triggered by following race condition.

data + post flush         a flush

    issued to driver      blk_mq_dispatch_rq_list
                            try to issue a flush req
                            failed due to NON-NCQ command
                            .queue_rq return BLK_STS_DEV_RESOURCE

request completion
  req->end_io // doesn't check RESTART
        do nothing because previous flush
        has not been completed
                              insert rq to hctx->dispatch
                              due to RESTART is still set, do nothing

To fix this, replace the blk_mq_run_hw_queue in mq_flush_data_end_io
with blk_mq_sched_restart to check and clear the RESTART flag.

Fixes: bd166ef1 (blk-mq-sched: add framework for MQ capable IO schedulers)
Reported-by: Florian Stecker <>
Tested-by: Florian Stecker <>
Signed-off-by: Jianchao Wang <>
Signed-off-by: Jens Axboe <>
Signed-off-by: Sasha Levin <>
 block/blk-flush.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/blk-flush.c b/block/blk-flush.c
index 4938bec8cfef..6603352879e7 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -402,7 +402,7 @@ static void mq_flush_data_end_io(struct request *rq, blk_status_t error)
 	blk_flush_complete_seq(rq, fq, REQ_FSEQ_DATA, error);
 	spin_unlock_irqrestore(&fq->mq_flush_lock, flags);
-	blk_mq_run_hw_queue(hctx, true);
+	blk_mq_sched_restart(hctx);

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