[PATCH 4.9 52/94] nvme: avoid to use blk_mq_abort_requeue_list()

Greg Kroah-Hartman
2017-06-05T16:25:50Z

From: Ming Lei <ming.lei@redhat.com>

commit 986f75c876dbafed98eba7cb516c5118f155db23 upstream.

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().

Reported-by: Zhang Yi <yizhan@redhat.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/nvme/host/core.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1725,7 +1725,6 @@ static void nvme_ns_remove(struct nvme_n
sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
&nvme_ns_attr_group);
del_gendisk(ns->disk);
- blk_mq_abort_requeue_list(ns->queue);
blk_cleanup_queue(ns->queue);
}

@@ -2048,7 +2047,6 @@ void nvme_kill_queues(struct nvme_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.
@@ -2056,6 +2054,9 @@ void nvme_kill_queues(struct nvme_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);
}