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nvme: host: unquiesce queue in nvme_kill_queues() 

When nvme_kill_queues() is run, queues may be in
quiesced state, so we forcibly unquiesce queues to avoid
blocking dispatch, and I/O hang can be avoided in
remove path.

Peviously we use blk_mq_start_stopped_hw_queues() as
counterpart of blk_mq_quiesce_queue(), now we have
introduced blk_mq_unquiesce_queue(), so use it explicitly.

Cc: linux-nvme@lists.infradead.org
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2017-06-19 10:21:08 +08:00 committed by Jens Axboe
parent 641a9ed60f
commit 443bd90f2c
1 changed files with 6 additions and 0 deletions
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6
drivers/nvme/host/core.c
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@ -2581,6 +2581,9 @@ void nvme_kill_queues(struct nvme_ctrl *ctrl)
mutex_lock(&ctrl->namespaces_mutex);
/* Forcibly unquiesce queues to avoid blocking dispatch */
blk_mq_unquiesce_queue(ctrl->admin_q);
/* Forcibly start all queues to avoid having stuck requests */
blk_mq_start_hw_queues(ctrl->admin_q);
@ -2594,6 +2597,9 @@ void nvme_kill_queues(struct nvme_ctrl *ctrl)
revalidate_disk(ns->disk);
blk_set_queue_dying(ns->queue);
/* Forcibly unquiesce queues to avoid blocking dispatch */
blk_mq_unquiesce_queue(ns->queue);
/*
* Forcibly start all queues to avoid having stuck requests.
* Note that we must ensure the queues are not stopped