linux-kernel - Re: [PATCH 5/7] cpufreq: balance out cpufreq_cpu_{get,put} for scaling drivers using setpolicy

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Message-ID: <5111BB2E.2090505@gmail.com>
Date:	Tue, 05 Feb 2013 18:08:46 -0800
From:	Dirk Brandewie <dirk.brandewie@...il.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	dirk.brandewie@...il.com, linux-kernel@...r.kernel.org,
	cpufreq@...r.kernel.org,
	Dirk Brandewie <dirk.j.brandewie@...el.com>
Subject: Re: [PATCH 5/7] cpufreq: balance out cpufreq_cpu_{get,put} for scaling
 drivers using setpolicy

On 02/05/2013 05:58 PM, Viresh Kumar wrote:
> On Tue, Feb 5, 2013 at 11:54 PM,  <dirk.brandewie@...il.com> wrote:
>> From: Dirk Brandewie <dirk.brandewie@...il.com>
>>
>> There is an additional reference added to the driver in
>> cpufreq_add_dev()  that is removed in__cpufreq_governor() if the
>> driver implements target().  Remove the last reference when the
>> driver implements setpolicy()
>>
>> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@...el.com>
>> ---
>>   drivers/cpufreq/cpufreq.c |    3 +++
>>   1 files changed, 3 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
>> index 622e282..d17477b 100644
>> --- a/drivers/cpufreq/cpufreq.c
>> +++ b/drivers/cpufreq/cpufreq.c
>> @@ -1049,6 +1049,9 @@ static int __cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif
>>          if (cpufreq_driver->target)
>>                  __cpufreq_governor(data, CPUFREQ_GOV_STOP);
>>
>> +       if (cpufreq_driver->setpolicy)
>> +               cpufreq_cpu_put(data);
>
> I don't understand this patch at all.. I grepped both cpufreq_cpu_get() & put()
> in bleeding-edge and found everything to be correct.
>
> Can you please point me to the exact line numbers ?
>

Line 878 in cpufreq_add_dev()

--Dirk
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