From: Yuchung Cheng <ycheng@google.com>
Date: Mon, 7 Feb 2011 12:57:04 +0000 (+0000)
Subject: tcp: undo_retrans counter fixes
X-Git-Tag: v2.6.38-rc7~47^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c24f691b56107feeba076616982093ee2d3c8fb5;p=pandora-kernel.git

tcp: undo_retrans counter fixes

Fix a bug that undo_retrans is incorrectly decremented when undo_marker is
not set or undo_retrans is already 0. This happens when sender receives
more DSACK ACKs than packets retransmitted during the current
undo phase. This may also happen when sender receives DSACK after
the undo operation is completed or cancelled.

Fix another bug that undo_retrans is incorrectly incremented when
sender retransmits an skb and tcp_skb_pcount(skb) > 1 (TSO). This case
is rare but not impossible.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
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