blkcg: don't hold blkcg lock when deactivating policy
As described in the comment of blkcg_activate_policy(), *Update of each blkg is protected by both queue and blkcg locks so that holding either lock and testing blkcg_policy_enabled() is always enough for dereferencing policy data.* with queue lock held, there is no need to hold blkcg lock in blkcg_deactivate_policy(). Similar case is in blkcg_activate_policy(), which has removed holding of blkcg lock in commit 4c55f4f9. Signed-off-by: NJiang Biao <jiang.biao2@zte.com.cn> Signed-off-by: NWen Yang <wen.yang99@zte.com.cn> CC: Tejun Heo <tj@kernel.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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