From: Octavian Purdila <opurdila@ixiacom.com>
Date: Sat, 28 Jun 2008 00:27:21 +0000 (-0700)
Subject: tcp: fix for splice receive when used with software LRO
X-Git-Tag: v2.6.26-rc9~84^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=db43a282d3ec92ea45109c5551fff3dcc5afef02;p=pandora-kernel.git

tcp: fix for splice receive when used with software LRO

If an skb has nr_frags set to zero but its frag_list is not empty (as
it can happen if software LRO is enabled), and a previous
tcp_read_sock has consumed the linear part of the skb, then
__skb_splice_bits:

(a) incorrectly reports an error and

(b) forgets to update the offset to account for the linear part

Any of the two problems will cause the subsequent __skb_splice_bits
call (the one that handles the frag_list skbs) to either skip data,
or, if the unadjusted offset is greater then the size of the next skb
in the frag_list, make tcp_splice_read loop forever.

Signed-off-by: Octavian Purdila <opurdila@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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