tipc: wakeup sleeping users at disconnect

Until now, in filter_connect() when we terminate a connection due to
an error message from peer, we set the socket state to DISCONNECTING.

The socket is notified about this broken connection using EPIPE when
a user tries to send a message. However if a socket was waiting on a
poll() while the connection is being terminated, we fail to wakeup
that socket.

In this commit, we wakeup sleeping sockets at connection termination.
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/socket.c

@@ -1599,6 +1599,7 @@ static bool filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
 			/* Let timer expire on it's own */
 			tipc_node_remove_conn(net, tsk_peer_node(tsk),
 					      tsk->portid);
+			sk->sk_state_change(sk);
 		}
 		return true;