cfq-iosched: don't check cfqg in choose_service_tree()
authorGui Jianfeng <guijianfeng@cn.fujitsu.com>
Fri, 17 Dec 2010 07:57:14 +0000 (08:57 +0100)
committerJens Axboe <jaxboe@fusionio.com>
Fri, 17 Dec 2010 07:57:14 +0000 (08:57 +0100)
commit7278c9c19bd85cf33213a2e0b538a18d3ac8ad00
treee080ada1f8cc00fef4600976f8cf489cc94d1c03
parenta8adbe378b56acd5945df70753c7e8f6fe223304
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>
block/cfq-iosched.c