From: Jon Paul Maloy Date: Mon, 2 May 2016 15:58:45 +0000 (-0400) Subject: tipc: re-enable compensation for socket receive buffer double counting X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7c8bcfb1255fe9d929c227d67bdcd84430fd200b;p=linux-beck.git tipc: re-enable compensation for socket receive buffer double counting In the refactoring commit d570d86497ee ("tipc: enqueue arrived buffers in socket in separate function") we did by accident replace the test if (sk->sk_backlog.len == 0) atomic_set(&tsk->dupl_rcvcnt, 0); with if (sk->sk_backlog.len) atomic_set(&tsk->dupl_rcvcnt, 0); This effectively disables the compensation we have for the double receive buffer accounting that occurs temporarily when buffers are moved from the backlog to the socket receive queue. Until now, this has gone unnoticed because of the large receive buffer limits we are applying, but becomes indispensable when we reduce this buffer limit later in this series. We now fix this by inverting the mentioned condition. Acked-by: Ying Xue Signed-off-by: Jon Maloy Signed-off-by: David S. Miller --- diff --git a/net/tipc/socket.c b/net/tipc/socket.c index 3eeb50a27b89..d37a9401e182 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -1748,7 +1748,7 @@ static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, /* Try backlog, compensating for double-counted bytes */ dcnt = &tipc_sk(sk)->dupl_rcvcnt; - if (sk->sk_backlog.len) + if (!sk->sk_backlog.len) atomic_set(dcnt, 0); lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); if (likely(!sk_add_backlog(sk, skb, lim)))