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cgroup: grab cgroup_mutex in drop_parsed_module_refcounts()
This isn't strictly necessary as all subsystems specified in @subsys_mask are guaranteed to be pinned; however, it does spuriously trigger lockdep warning. Let's grab cgroup_mutex around it. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
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@ -1325,11 +1325,11 @@ static void drop_parsed_module_refcounts(unsigned long subsys_mask)
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struct cgroup_subsys *ss;
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int i;
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for_each_subsys(ss, i) {
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if (!(subsys_mask & (1UL << i)))
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continue;
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module_put(cgroup_subsys[i]->module);
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}
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mutex_lock(&cgroup_mutex);
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for_each_subsys(ss, i)
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if (subsys_mask & (1UL << i))
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module_put(cgroup_subsys[i]->module);
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mutex_unlock(&cgroup_mutex);
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}
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static int cgroup_remount(struct super_block *sb, int *flags, char *data)
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