From: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Date: Wed, 1 Apr 2009 23:18:20 +0000 (+0000)
Subject: tcp: miscounts due to tcp_fragment pcount reset
X-Git-Tag: v2.6.30-rc1~246^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9eb9362e569062e2f841b7a023e5fcde10ed63b4;p=pandora-kernel.git

tcp: miscounts due to tcp_fragment pcount reset

It seems that trivial reset of pcount to one was not sufficient
in tcp_retransmit_skb. Multiple counters experience a positive
miscount when skb's pcount gets lowered without the necessary
adjustments (depending on skb's sacked bits which exactly), at
worst a packets_out miscount can crash at RTO if the write queue
is empty!

Triggering this requires mss change, so bidir tcp or mtu probe or
like.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Tested-by: Uwe Bugla <uwe.bugla@gmx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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