RFC 4015 section 3.4 says the TCP sender MUST refrain from
reversing the congestion control state when the ACK signals
congestion through the ECN-Echo flag. Currently we may not
always do that when prior_ssthresh is reset upon receiving
ACKs with ECE marks. This patch fixes that.

Signed-off-by: Yuchung Cheng <ych...@google.com>
Signed-off-by: Neal Cardwell <ncardw...@google.com>
Signed-off-by: Eric Dumazet <eduma...@google.com>
---
 net/ipv4/tcp_input.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index d2ad433..1c2a734 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2366,8 +2366,6 @@ static void tcp_undo_cwnd_reduction(struct sock *sk, bool 
unmark_loss)
                        tp->snd_ssthresh = tp->prior_ssthresh;
                        tcp_ecn_withdraw_cwr(tp);
                }
-       } else {
-               tp->snd_cwnd = max(tp->snd_cwnd, tp->snd_ssthresh);
        }
        tp->snd_cwnd_stamp = tcp_time_stamp;
        tp->undo_marker = 0;
-- 
2.7.0.rc3.207.g0ac5344

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