tcp: tcp_prequeue() can use keyed wakeups

When TCP frees up write buffer space, avoid waking up tasks that have done a poll() or select() on the same socket specifying read-side events. This is an extension of a read-side patch by Eric Dumazet. Signed-off-by: John Dykstra <[email protected]> Acked-by: Eric Dumazet <[email protected]> Signed-off-by: David S. Miller <[email protected]>
jledet · May 18, 2009 · 9dc20c5 · 9dc20c5
1 parent d44b5e0
commit 9dc20c5
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/net/core/stream.c b/net/core/stream.c
@@ -33,7 +33,8 @@ void sk_stream_write_space(struct sock *sk)
 		clear_bit(SOCK_NOSPACE, &sock->flags);
 
 		if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
-			wake_up_interruptible(sk->sk_sleep);
+			wake_up_interruptible_poll(sk->sk_sleep, POLLOUT |
+						POLLWRNORM | POLLWRBAND);
 		if (sock->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN))
 			sock_wake_async(sock, SOCK_WAKE_SPACE, POLL_OUT);
 	}