tree 305b08304869b3f8d57a191b4b23968e53b53247
parent 65635cbc37e011e71b208257a25e7c1078cd039b
author Jun'ichi Nomura <j-nomura@ce.jp.nec.com> 1350868537 +0900
committer Jens Axboe <axboe@kernel.dk> 1350936026 +0200

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>