tipc: refactor function tipc_sk_timeout()

We refactor this function as a preparation for the coming commits in
the same series.
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/socket.c

@@ -2545,43 +2545,57 @@ static int tipc_shutdown(struct socket *sock, int how)
 	return res;
 }
 
+static void tipc_sk_check_probing_state(struct sock *sk,
+					struct sk_buff_head *list)
+{
+	struct tipc_sock *tsk = tipc_sk(sk);
+	u32 pnode = tsk_peer_node(tsk);
+	u32 pport = tsk_peer_port(tsk);
+	u32 self = tsk_own_node(tsk);
+	u32 oport = tsk->portid;
+	struct sk_buff *skb;
+
+	if (tsk->probe_unacked) {
+		tipc_set_sk_state(sk, TIPC_DISCONNECTING);
+		sk->sk_err = ECONNABORTED;
+		tipc_node_remove_conn(sock_net(sk), pnode, pport);
+		sk->sk_state_change(sk);
+		return;
+	}
+	/* Prepare new probe */
+	skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
+			      pnode, self, pport, oport, TIPC_OK);
+	if (skb)
+		__skb_queue_tail(list, skb);
+	tsk->probe_unacked = true;
+	sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
+}
+
 static void tipc_sk_timeout(struct timer_list *t)
 {
 	struct sock *sk = from_timer(sk, t, sk_timer);
 	struct tipc_sock *tsk = tipc_sk(sk);
-	u32 peer_port = tsk_peer_port(tsk);
-	u32 peer_node = tsk_peer_node(tsk);
-	u32 own_node = tsk_own_node(tsk);
-	u32 own_port = tsk->portid;
-	struct net *net = sock_net(sk);
-	struct sk_buff *skb = NULL;
+	u32 pnode = tsk_peer_node(tsk);
+	struct sk_buff_head list;
 
+	skb_queue_head_init(&list);
 	bh_lock_sock(sk);
-	if (!tipc_sk_connected(sk))
-		goto exit;
 
 	/* Try again later if socket is busy */
 	if (sock_owned_by_user(sk)) {
 		sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
-		goto exit;
+		bh_unlock_sock(sk);
+		return;
 	}
 
-	if (tsk->probe_unacked) {
-		tipc_set_sk_state(sk, TIPC_DISCONNECTING);
-		tipc_node_remove_conn(net, peer_node, peer_port);
-		sk->sk_state_change(sk);
-		goto exit;
-	}
-	/* Send new probe */
-	skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
-			      peer_node, own_node, peer_port, own_port,
-			      TIPC_OK);
-	tsk->probe_unacked = true;
-	sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
-exit:
+	if (sk->sk_state == TIPC_ESTABLISHED)
+		tipc_sk_check_probing_state(sk, &list);
+
 	bh_unlock_sock(sk);
-	if (skb)
-		tipc_node_xmit_skb(net, skb, peer_node, own_port);
+
+	if (!skb_queue_empty(&list))
+		tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
+
 	sock_put(sk);
 }