From: Yuchung Cheng <ycheng@google.com>
Date: Mon, 30 Apr 2012 06:00:18 +0000 (+0000)
Subject: tcp: fix infinite cwnd in tcp_complete_cwr()
X-Git-Tag: v3.2.18~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b713f6c7d317c136f03c132203d0900f4a0de084;p=pandora-kernel.git

tcp: fix infinite cwnd in tcp_complete_cwr()

[ Upstream commit 1cebce36d660c83bd1353e41f3e66abd4686f215 ]

When the cwnd reduction is done, ssthresh may be infinite
if TCP enters CWR via ECN or F-RTO. If cwnd is not undone, i.e.,
undo_marker is set, tcp_complete_cwr() falsely set cwnd to the
infinite ssthresh value. The correct operation is to keep cwnd
intact because it has been updated in ECN or F-RTO.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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