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cgroup: minor tweak for logic to get cgroup css

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We could only handle the case that css exists
and css_try_get_online() fails.

Signed-off-by: Peng Wang <rocking@whu.edu.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Peng Wang 2019-07-03 10:07:49 +08:00 committed by Tejun Heo
parent 85db002337
commit a581563f1b
1 changed files with 1 additions and 1 deletions
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2
kernel/cgroup/cgroup.c
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@ -488,7 +488,7 @@ static struct cgroup_subsys_state *cgroup_tryget_css(struct cgroup *cgrp,
rcu_read_lock();
css = cgroup_css(cgrp, ss);
if (!css || !css_tryget_online(css))
if (css && !css_tryget_online(css))
css = NULL;
rcu_read_unlock();