fs: dlm: be sure to call dlm_send_queue_flush()

[ Upstream commit 7354fa4e ]

If we release a midcomms node structure, there should be nothing left
inside the dlm midcomms send queue. However, sometimes this is not true
because I believe some DLM_FIN message was not acked... if we run
into a shutdown timeout, then we should be sure there is no pending send
dlm message inside this queue when releasing midcomms node structure.

Cc: stable@vger.kernel.org
Fixes: 489d8e55 ("fs: dlm: add reliable connection if reconnect")
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

fs/dlm/midcomms.c

@@ -1367,6 +1367,7 @@ static void midcomms_node_release(struct rcu_head *rcu)
 	struct midcomms_node *node = container_of(rcu, struct midcomms_node, rcu);
 
 	WARN_ON_ONCE(atomic_read(&node->send_queue_cnt));
+	dlm_send_queue_flush(node);
 	kfree(node);
 }