cgroup: release cgroup_mutex over file removals
Now that cftypes and all tree modification operations are protected by cgroup_tree_mutex, we can drop cgroup_mutex while deleting files and directories. Drop cgroup_mutex over removals. This doesn't make any noticeable difference now but is to help kernfs conversion. In kernfs, removals are sync points which drain in-flight operations as those operations would grab cgroup_mutex, trying to delete under cgroup_mutex would deadlock. This can be resolved by just holding the outer cgroup_tree_mutex which nests outside both kernfs active reference and cgroup_mutex. Signed-off-by:Tejun Heo <tj@kernel.org> Acked-by:
Li Zefan <lizefan@huawei.com>
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ace2bee8
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