cgroup: cgroup->subsys[] should be cleared after the css is offlined

After a css finishes offlining, offline_css() mistakenly performs
RCU_INIT_POINTER(css->cgroup->subsys[ss->id], css) which just sets the
cgroup->subsys[] pointer to the current value.  The intention was to
clear it after offline is complete, not reassign the same value.

Update it to assign NULL instead of the current value.  This makes
cgroup_css() to return NULL once offline is complete.  All the
existing users of the function either can handle NULL return already
or guarantee that the css doesn't get offlined.

While this is a bugfix, as css lifetime is currently tied to the
cgroup it belongs to, this bug doesn't cause any actual problems.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index ad28866ed44c6acc0556e74157e83ce6c5fc8b27..83a8fff43d68ebb0e2c7c676d707cfecc6ae24c1 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3710,7 +3710,7 @@ static void offline_css(struct cgroup_subsys_state *css)
 
        css->flags &= ~CSS_ONLINE;
        css->cgroup->nr_css--;
-       RCU_INIT_POINTER(css->cgroup->subsys[ss->id], css);
+       RCU_INIT_POINTER(css->cgroup->subsys[ss->id], NULL);
 }
 
 /**