scsi: iscsi: iscsi_tcp: Start socket shutdown during conn stop

Make sure the conn socket shutdown starts before we start the timer to fail
commands to upper layers.

Link: https://lore.kernel.org/r/20210525181821.7617-10-michael.christie@oracle.com
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/iscsi_tcp.c

@@ -600,6 +600,12 @@ static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
 	if (!sock)
 		return;
 
+	/*
+	 * Make sure we start socket shutdown now in case userspace is up
+	 * but delayed in releasing the socket.
+	 */
+	kernel_sock_shutdown(sock, SHUT_RDWR);
+
 	sock_hold(sock->sk);
 	iscsi_sw_tcp_conn_restore_callbacks(conn);
 	sock_put(sock->sk);