linux-kernel - [PATCH 4.4 112/192] [PATCH 116/135] blk-mq: End unstarted requests on dying queue

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Date:   Mon, 12 Sep 2016 19:00:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagig@...lanox.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.4 112/192] [PATCH 116/135] blk-mq: End unstarted requests on dying queue

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

------------------

[ Upstream commit a59e0f5795fe52dad42a99c00287e3766153b312 ]

Go directly to ending a request if it wasn't started. Previously, completing a
request may invoke a driver callback for a request it didn't initialize.

Signed-off-by: Keith Busch <keith.busch@...el.com>
Reviewed-by: Sagi Grimberg <sagig@...lanox.com>
Reviewed-by: Johannes Thumshirn <jthumshirn at suse.de>
Acked-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jens Axboe <axboe@...com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 block/blk-mq.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -601,8 +601,10 @@ static void blk_mq_check_expired(struct
 		 * If a request wasn't started before the queue was
 		 * marked dying, kill it here or it'll go unnoticed.
 		 */
-		if (unlikely(blk_queue_dying(rq->q)))
-			blk_mq_complete_request(rq, -EIO);
+		if (unlikely(blk_queue_dying(rq->q))) {
+			rq->errors = -EIO;
+			blk_mq_end_request(rq, rq->errors);
+		}
 		return;
 	}
 	if (rq->cmd_flags & REQ_NO_TIMEOUT)