UBUNTU: SAUCE: Ibmvscsis: Properly deregister target sessions

BugLink: http://bugs.launchpad.net/bugs/1615665

The driver currently doesn't properly deregisters target sessions
completely, so this will address that.
Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Michael Cyr <mikecyr@linux.vnet.ibm.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Acked-by: Kamal Mostafa <kamal@canonical.com>

drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c

@@ -1934,6 +1934,8 @@ static int ibmvscsis_drop_nexus(struct ibmvscsis_tport *tport)
 	/*
 	 * Release the SCSI I_T Nexus to the emulated ibmvscsis Target Port
 	 */
+	target_wait_for_sess_cmds(se_sess);
+	transport_deregister_session_configfs(se_sess);
 	transport_deregister_session(se_sess);
 	tport->ibmv_nexus = NULL;
 	kfree(nexus);