From: Vivek Goyal <vgoyal@redhat.com>
Date: Mon, 5 Mar 2012 21:15:10 +0000 (-0800)
Subject: blkcg: skip blkg printing if q isn't associated with disk
X-Git-Tag: v3.5-rc1~42^2~76
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=92616b5b3a7c7fa8148df82e7ff6183056f2bfc8;p=pandora-kernel.git

blkcg: skip blkg printing if q isn't associated with disk

blk-cgroup printing code currently assumes that there is a device/disk
associated with every queue in the system, but modules like floppy,
can instantiate request queues without registering disk which can lead
to oops.

Skip the queue/blkg which don't have dev/disk associated with them.

-tj: Factored out backing_dev_info check into blkg_dev_name().

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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