This patch allows vring_state_changed() to clear in-flight
dequeue packets. It also clears the in-flight packets in
a thread-safe way in destroy_device().
Signed-off-by: Yuan Wang <yuanx.wang@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Jiayu Hu <jiayu.hu@intel.com>
4cc4f3ee12