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Commit eb178d06 authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
parent 1672d040

kernel/cgroup.c

+5 −5
Original line number Original line Diff line number Diff line
@@ -1325,11 +1325,11 @@ static void drop_parsed_module_refcounts(unsigned long subsys_mask) 
	struct cgroup_subsys *ss;

	struct cgroup_subsys *ss;

	int i;

	int i;





	for_each_subsys(ss, i) {

	mutex_lock(&cgroup_mutex);

		if (!(subsys_mask & (1UL << i)))

	for_each_subsys(ss, i)

			continue;

		if (subsys_mask & (1UL << i))

			module_put(cgroup_subsys[i]->module);

			module_put(cgroup_subsys[i]->module);

	}

	mutex_unlock(&cgroup_mutex);

}

}





static int cgroup_remount(struct super_block *sb, int *flags, char *data)

static int cgroup_remount(struct super_block *sb, int *flags, char *data)