Commits
Vivek Goyal committed 92616b5b3a7
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>