nvme: Fix a race condition related to stopping queues

Avoid that nvme_queue_rq() is still running when nvme_stop_queues()
returns.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index e8070e3..75565b5 100644 (file)
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2081,7 +2081,7 @@ void nvme_stop_queues(struct nvme_ctrl *ctrl)
                queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue);
                spin_unlock_irq(ns->queue->queue_lock);
 
-               blk_mq_stop_hw_queues(ns->queue);
+               blk_mq_quiesce_queue(ns->queue);
        }
        mutex_unlock(&ctrl->namespaces_mutex);
 }