From: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Date: Fri, 17 Dec 2010 07:57:14 +0000 (+0100)
Subject: cfq-iosched: don't check cfqg in choose_service_tree()
X-Git-Tag: v2.6.38-rc1~231^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7278c9c19bd85cf33213a2e0b538a18d3ac8ad00;p=pandora-kernel.git

cfq-iosched: don't check cfqg in choose_service_tree()

When cfq_choose_cfqg() is called in select_queue(), there must be at least one
backlogged CFQ queue waiting for dispatching, hence there must be at least one
backlogged CFQ group on service tree. So we never call choose_service_tree()
with cfqg == NULL.

Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---

Reading git-diff-tree failed