提交 986f75c8 编写于 作者: M Ming Lei 提交者: Christoph Hellwig

nvme: avoid to use blk_mq_abort_requeue_list()

NVMe may add request into requeue list simply and not kick off the
requeue if hw queues are stopped. Then blk_mq_abort_requeue_list()
is called in both nvme_kill_queues() and nvme_ns_remove() for
dealing with this issue.

Unfortunately blk_mq_abort_requeue_list() is absolutely a
race maker, for example, one request may be requeued during
the aborting. So this patch just calls blk_mq_kick_requeue_list() in
nvme_kill_queues() to handle this issue like what nvme_start_queues()
does. Now all requests in requeue list when queues are stopped will be
handled by blk_mq_kick_requeue_list() when queues are restarted, either
in nvme_start_queues() or in nvme_kill_queues().

Cc: stable@vger.kernel.org
Reported-by: NZhang Yi <yizhan@redhat.com>
Reviewed-by: NKeith Busch <keith.busch@intel.com>
Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: NMing Lei <ming.lei@redhat.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
上级 806f026f
......@@ -2098,7 +2098,6 @@ static void nvme_ns_remove(struct nvme_ns *ns)
if (ns->ndev)
nvme_nvm_unregister_sysfs(ns);
del_gendisk(ns->disk);
blk_mq_abort_requeue_list(ns->queue);
blk_cleanup_queue(ns->queue);
}
......@@ -2436,7 +2435,6 @@ void nvme_kill_queues(struct nvme_ctrl *ctrl)
continue;
revalidate_disk(ns->disk);
blk_set_queue_dying(ns->queue);
blk_mq_abort_requeue_list(ns->queue);
/*
* Forcibly start all queues to avoid having stuck requests.
......@@ -2444,6 +2442,9 @@ void nvme_kill_queues(struct nvme_ctrl *ctrl)
* when the final removal happens.
*/
blk_mq_start_hw_queues(ns->queue);
/* draining requests in requeue list */
blk_mq_kick_requeue_list(ns->queue);
}
mutex_unlock(&ctrl->namespaces_mutex);
}
......
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