Quoting Aristeu Rozanski (a...@redhat.com):
> Cc: Tejun Heo <t...@kernel.org>
> Cc: Serge Hallyn <serge.hal...@canonical.com>

Acked-by: Serge Hallyn <serge.hal...@canonical.com>

> Signed-off-by: Aristeu Rozanski <a...@redhat.com>
> ---
>  security/device_cgroup.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> Index: github/security/device_cgroup.c
> ===================================================================
> --- github.orig/security/device_cgroup.c      2012-11-26 17:13:54.008153189 
> -0500
> +++ github/security/device_cgroup.c   2012-11-27 11:58:43.574251075 -0500
> @@ -215,7 +215,11 @@
>       struct dev_cgroup *dev_cgroup;
>  
>       dev_cgroup = cgroup_to_devcgroup(cgroup);
> +
> +     mutex_lock(&devcgroup_mutex);
>       dev_exception_clean(dev_cgroup);
> +     mutex_unlock(&devcgroup_mutex);
> +
>       kfree(dev_cgroup);
>  }
>  
> 
> --
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