virtio_blk: quiesce/unquiesce live IO when entering PM states
Without it its not guaranteed that no .queue_rq is inflight. Reviewed-by: NMing Lei <ming.lei@redhat.com> Acked-by: NMichael S. Tsirkin <mst@redhat.com> Cc: virtio-dev@lists.oasis-open.org Cc: Jason Wang <jasowang@redhat.com> Signed-off-by: NSagi Grimberg <sagi@grimberg.me>
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