From: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Date: Mon, 22 Oct 2012 01:15:37 +0000 (+0900)
Subject: blkcg: stop iteration early if root_rl is the only request list
X-Git-Tag: v3.7-rc4~23^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=65c77fd9e8a1c8c3da0bbbea6b7efa3d6ef265f8;p=pandora-kernel.git

blkcg: stop iteration early if root_rl is the only request list

__blk_queue_next_rl() finds next request list based on blkg_list
while skipping root_blkg in the list.
OTOH, root_rl is special as it may exist even without root_blkg.

Though the later part of the function handles such a case correctly,
exiting early is good for readability of the code.

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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