[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>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index ed900fe96bdf..2a6a5a6b4c12 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1208,7 +1208,8 @@ static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
         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 @@ static void wakeupdispatch(struct tipc_port *tport)
 {
         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);
 }
 
 /**