It is possible that nbd pthread is created but not executed,
then spdk_nbd_stop is call before nbd_pthread's execution,
but nbd pthread starts to execute while nbd is totally stopped.
This patch can get spdk_stop_nbd aligned with nbd pthread.
Change-Id: I57cc92b94d36cd706616c9058134f716f0812892
Signed-off-by: Liu Xiaodong <xiaodong.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6278
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: <dongx.yi@intel.com>
22412af1d2