Re: [RFC PATCH v5 1/2] Use lock_device_hotplug() in cpu_probe_store() and cpu_release_store()

[Tejun Heo]

On Fri, Apr 25, 2014 at 09:56:10AM +0800, Li Zhong wrote:
> > A nests cpu subsys mutex under s_active of the online node.  B nests
> > s_active of the online node under the cpu subsys mutex.  What am I
> > missing?
> 
> From the above two chain, I think the problem is cpu_subsys_mutex and
> s_active(online), which is the deadlock we are trying to solve in patch

Yeap, that one was what I was thinking about.

> #2. I seems to me s_active(release) here doesn't have lock issues? 

And your patch doesn't change the situation for online.  Alright,
thanks a lot for the explanation.

-- 
tejun
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