From: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Date: Mon, 17 Oct 2011 23:07:30 +0000 (-0400)
Subject: udplite: fast-path computation of checksum coverage
X-Git-Tag: v3.1~9^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f36c23bb9f822904dacf83a329518d0a5fde7968;p=pandora-kernel.git

udplite: fast-path computation of checksum coverage

Commit 903ab86d195cca295379699299c5fc10beba31c7 of 1 March this year ("udp: Add
lockless transmit path") introduced a new fast TX path that broke the checksum
coverage computation of UDP-lite, which so far depended on up->len (only set
if the socket is locked and 0 in the fast path).

Fixed by providing both fast- and slow-path computation of checksum coverage.
The latter can be removed when UDP(-lite)v6 also uses a lockless transmit path.

Reported-by: Thomas Volkert <thomas@homer-conferencing.com>
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
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