Re: [PATCH 1/7] cgroup: Implement cgroup_show_cftypes()

[Michal Koutný]

On Wed, Aug 07, 2024 at 02:25:23PM GMT, Tejun Heo <tj@xxxxxxxxxx> wrote:
> +void cgroup_show_cftype(struct cftype *cft, bool show)
> +{
> +	struct cgroup_subsys *ss = cft->ss;
> +	struct cgroup *root = ss ? &ss->root->cgrp : &cgrp_dfl_root.cgrp;

Strictly speaking, this (v1) cgroup_root dereference should be guarded
with cgroup_mutex too (should be the root destroy concurrently).

> +	struct cgroup_subsys_state *css;
> +
> +	mutex_lock(&cgroup_mutex);

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