Re: [Update][PATCH] cpufreq: Do not hold driver module referencesfor additional policy CPUs

From: Srivatsa S. Bhat
Date: Fri Aug 02 2013 - 06:16:07 EST

On 08/02/2013 03:06 PM, Viresh Kumar wrote:
> On 2 August 2013 12:19, Srivatsa S. Bhat
> <srivatsa.bhat@xxxxxxxxxxxxxxxxxx> wrote:
>> On 08/02/2013 10:07 AM, Viresh Kumar wrote:
>>> So, we can't rmmod the module as soon as it is inserted and so the
>>> problem stays as is. :(
>> No, we get one step closer to the solution, since we fix the inconsistency
>> between refcounts. Next step would be to get rid of refcounts and use
>> locking like you suggested. Then we can rmmod it easily. I'm assuming
>> Rafael has the same plan.
> Not really. We are putting the reference at the end of add_dev() and
> so refcount would be zero when we aren't running any critical sections.
> And so, we can rmmod the module now and that problem is gone.

Ah, yes, you are right.

> @Rafael: I will try to do generic cleanups in cpufreq in coming time
> and will take care to remove .owner field completely in that. Until that
> point your patches look fine:
> For both of your patches:
> Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>

Srivatsa S. Bhat

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