From: John Dykstra <john.dykstra1@gmail.com>
Date: Tue, 12 May 2009 15:34:50 +0000 (+0000)
Subject: tcp: tcp_prequeue() can use keyed wakeups
X-Git-Tag: firefly_0821_release~13604^2~497
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9dc20c5f78c53bf57fb7874b6e942842e1db20d3;p=firefly-linux-kernel-4.4.55.git

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 <john.dykstra1@gmail.com>
Acked-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/stream.c b/net/core/stream.c
index 8727cead64ad..a37debfeb1b2 100644
--- 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);
 	}