From: James Hogan <james.hogan@imgtec.com>
Date: Mon, 8 Jul 2013 11:21:47 +0000 (+0100)
Subject: metag: checksum.h: fix carry in csum_tcpudp_nofold
X-Git-Tag: v3.11-rc1~59^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d903bca9bc542bd6d60019f9f761be15ad79c956;p=pandora-kernel.git

metag: checksum.h: fix carry in csum_tcpudp_nofold

In csum_tcpudp_nofold, add 1 if the carry bit is set after adding the
destination IP address (32 bits) to the checksum (16 bits).

The lack of carry handling for this particular addition meant that a
destination address of *.*.255.255 (e.g. certain broadcasts) sometimes
resulted in an incorrect checksum. This bug has been present in the Meta
port since the code was written in the 2.4 days.

Reported-by: Marcin Nowakowski <Marcin.Nowakowski@pure.com>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
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