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 <t...@kernel.org>
---
kernel/cgroup.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1325,11 +1325,11 @@ static void drop_parsed_module_refcounts
struct cgroup_subsys *ss;
int i;
- for_each_subsys(ss, i) {
- if (!(subsys_mask & (1UL << i)))
- continue;
- module_put(cgroup_subsys[i]->module);
- }
+ mutex_lock(&cgroup_mutex);
+ for_each_subsys(ss, i)
+ if (subsys_mask & (1UL << i))
+ module_put(cgroup_subsys[i]->module);
+ mutex_unlock(&cgroup_mutex);
}
static int cgroup_remount(struct super_block *sb, int *flags, char *data)
--
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