[PATCH v2] xen-blkfront: fix mq start/stop race

[PATCH v2] xen-blkfront: fix mq start/stop race

[Junxiao Bi]

When ring buf full, hw queue will be stopped. While blkif interrupt consume
request and make free space in ring buf, hw queue will be started again.
But since start queue is protected by spin lock while stop not, that will
cause a race.

interrupt:                                      process:
blkif_interrupt()                               blkif_queue_rq()
 kick_pending_request_queues_locked()
   blk_mq_start_stopped_hw_queues()
      clear_bit(BLK_MQ_S_STOPPED, &hctx->state)
	                                             blk_mq_stop_hw_queue(hctx)
	  blk_mq_run_hw_queue(hctx, async)

If ring buf is made empty in this case, interrupt will never come, then the
hw queue will be stopped forever, all processes waiting for the pending io
in the queue will hung.

Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Ankur Arora <ankur.a.arora@oracle.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
---
 drivers/block/xen-blkfront.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index c852ed3c01d5..5468be4f8075 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -906,8 +906,8 @@ static blk_status_t blkif_queue_rq(struct blk_mq_hw_ctx *hctx,
 	return BLK_STS_IOERR;
 
 out_busy:
-	spin_unlock_irqrestore(&rinfo->ring_lock, flags);
 	blk_mq_stop_hw_queue(hctx);
+	spin_unlock_irqrestore(&rinfo->ring_lock, flags);
 	return BLK_STS_RESOURCE;
 }
 
-- 
1.7.9.5


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