Some ifc hardware require synchronization between disabling a queue and
saving queue-state from LM registers. When queue is disabled from vDPA
driver, ifc device stops executing new virtio-cmds and then updates LM
registers with used/avail index. Before saving the queue-state, vDPA
driver should wait until the queue is disabled from backend.
Fixes: 5d75517beffe ("vdpa/ifc/base: access block device registers")
Cc: stable@dpdk.org
Signed-off-by: Abhishek Maheshwari <abhishek.maheshwari@intel.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
Acked-by: Andy Pei <andy.pei@intel.com>
Reviewed-by: Mandal Purna Chandra <purna.chandra.mandal@intel.com>
518a27ef6b