From: Jens Axboe <jens.axboe@oracle.com>
Date: Mon, 5 Oct 2009 09:03:39 +0000 (+0200)
Subject: cfq-iosched: fix issue with rq-rq merging and fifo list ordering
X-Git-Tag: v2.6.32-rc5~26^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=30996f40bffe73f05abb92a4cec254befa8cecf7;p=pandora-kernel.git

cfq-iosched: fix issue with rq-rq merging and fifo list ordering

cfq uses rq->start_time as the fifo indicator, but that field may
get modified prior to cfq doing it's fifo list adjustment when
a request gets merged with another request. This can cause the
fifo list to become unordered.

Reported-by: Corrado Zoccolo <czoccolo@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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