DLM: use CF_CLOSE flag to stop dlm_send correctly

If reconnection fails while executing dlm_lowcomms_stop,
dlm_send will not stop.
Signed-off-by: NTadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: NTsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: NDavid Teigland <teigland@redhat.com>

fs/dlm/lowcomms.c

@@ -1643,6 +1643,7 @@ static int work_start(void)
 static void _stop_conn(struct connection *con, bool and_other)
 {
 	mutex_lock(&con->sock_mutex);
+	set_bit(CF_CLOSE, &con->flags);
 	set_bit(CF_READ_PENDING, &con->flags);
 	set_bit(CF_WRITE_PENDING, &con->flags);
 	if (con->sock && con->sock->sk)