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virtio_blk: quiesce/unquiesce live IO when entering PM states 

Without it its not guaranteed that no .queue_rq is inflight.

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Cc: virtio-dev@lists.oasis-open.org
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Sagi Grimberg 2017-07-04 10:03:03 +03:00
parent 436c15ab65
commit 9b3e990584
1 changed files with 2 additions and 2 deletions
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4
drivers/block/virtio_blk.c
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@ -840,7 +840,7 @@ static int virtblk_freeze(struct virtio_device *vdev)
/* Make sure no work handler is accessing the device. */
flush_work(&vblk->config_work);
blk_mq_stop_hw_queues(vblk->disk->queue);
blk_mq_quiesce_queue(vblk->disk->queue);
vdev->config->del_vqs(vdev);
return 0;
@ -857,7 +857,7 @@ static int virtblk_restore(struct virtio_device *vdev)
virtio_device_ready(vdev);
blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
blk_mq_unquiesce_queue(vblk->disk->queue);
return 0;
}
#endif