blk-cgroup: fix rcu lockdep warning
JIRA: https://issues.redhat.com/browse/RHEL-19193
Upstream Status: for-6.8/block
Signed-off-by: Ming Lei ming.lei@redhat.com
Edited by Ming Lei
JIRA: https://issues.redhat.com/browse/RHEL-19193
Upstream Status: for-6.8/block
Signed-off-by: Ming Lei ming.lei@redhat.com