commit cfb0c0890b200364c0886c0d9f0dc615f8114c43
author Allan Stephens <allan.stephens@windriver.com> Mon Oct 16 21:47:18 2006 -0700
committer David S. Miller <davem@sunset.davemloft.net> Wed Oct 18 19:55:17 2006 -0700
tree d3dedd5c3fad9e2b6ee26b53b10fb0039416ec64
parent e91ed0bcdfc4812c0342d64281ee985213df07c3

[TIPC]: Optimize wakeup logic when socket has no waiting processes

This patch adds a simple test so TIPC doesn't try waking up processes
waiting on a socket if there are none waiting.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Per Liden <per.liden@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/socket.c

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index ed900fe..2a6a5a6 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1208,7 +1208,8 @@
 	atomic_inc(&tipc_queue_size);
 	skb_queue_tail(&sock->sk->sk_receive_queue, buf);
 
-        wake_up_interruptible(sock->sk->sk_sleep);
+	if (waitqueue_active(sock->sk->sk_sleep))
+		wake_up_interruptible(sock->sk->sk_sleep);
 	return TIPC_OK;
 }
 
@@ -1223,7 +1224,8 @@
 {
 	struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle;
 
-        wake_up_interruptible(tsock->sk.sk_sleep);
+	if (waitqueue_active(tsock->sk.sk_sleep))
+		wake_up_interruptible(tsock->sk.sk_sleep);
 }
 
 /**