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cgroup: hold cgroup_mutex before calling css_offline()
cpuset no longer nests cgroup_mutex inside cpu_hotplug lock, so we don't have to release cgroup_mutex before calling css_offline(). Signed-off-by: Li Zefan <lizefan@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -580,6 +580,7 @@ propagation along the hierarchy. See the comment on
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cgroup_for_each_descendant_pre() for details.
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void css_offline(struct cgroup *cgrp);
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(cgroup_mutex held by caller)
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This is the counterpart of css_online() and called iff css_online()
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has succeeded on @cgrp. This signifies the beginning of the end of
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@ -4169,17 +4169,8 @@ static void offline_css(struct cgroup_subsys *ss, struct cgroup *cgrp)
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if (!(css->flags & CSS_ONLINE))
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return;
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/*
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* css_offline() should be called with cgroup_mutex unlocked. See
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* 3fa59dfbc3 ("cgroup: fix potential deadlock in pre_destroy") for
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* details. This temporary unlocking should go away once
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* cgroup_mutex is unexported from controllers.
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*/
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if (ss->css_offline) {
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mutex_unlock(&cgroup_mutex);
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if (ss->css_offline)
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ss->css_offline(cgrp);
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mutex_lock(&cgroup_mutex);
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}
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cgrp->subsys[ss->subsys_id]->flags &= ~CSS_ONLINE;
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}
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