linux-kernel - Re: [PATCH 1/1] Cpufreq: Remove fossil comment of cpufreq_set

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Date:	Wed, 11 Sep 2013 08:39:11 -0400
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] Cpufreq: Remove fossil comment of cpufreq_set_policy

On 09/11/2013 06:08 AM, Viresh Kumar wrote:
> On 11 September 2013 08:58, Lan Tianyu <tianyu.lan@...el.com> wrote:
>>  From 668e1b6fd94b5c0e56a651b4c60cbbc7a6868b46 Mon Sep 17 00:00:00 2001
>> From: Lan Tianyu <tianyu.lan@...el.com>
>> Date: Wed, 11 Sep 2013 11:31:15 +0800
>> Subject: [PATCH] Cpufreq/governor: Remove fossil comment
>>
>> cpufreq_set_policy() has been changed to origin __cpufreq_set_policy()
>> and policy->lock has been converted to rewrite lock by commit 5a01f2.
>> So remove it.
>>
>> Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
>> ---
>>   drivers/cpufreq/cpufreq_userspace.c | 11 -----------
>>   1 file changed, 11 deletions(-)
>>
>> diff --git a/drivers/cpufreq/cpufreq_userspace.c
>> b/drivers/cpufreq/cpufreq_userspace.c
>> index 0307809..4dbf1db 100644
>> --- a/drivers/cpufreq/cpufreq_userspace.c
>> +++ b/drivers/cpufreq/cpufreq_userspace.c
>> @@ -38,18 +38,7 @@ static int cpufreq_set(struct cpufreq_policy *policy,
>> unsigned int freq)
>>          if (!per_cpu(cpu_is_managed, policy->cpu))
>>                  goto err;
>>
>> -       /*
>> -        * We're safe from concurrent calls to ->target() here
>> -        * as we hold the userspace_mutex lock. If we were calling
>> -        * cpufreq_driver_target, a deadlock situation might occur:
>> -        * A: cpufreq_set (lock userspace_mutex) ->
>> -        *      cpufreq_driver_target(lock policy->lock)
>> -        * B: cpufreq_set_policy(lock policy->lock) ->
>> -        *      __cpufreq_governor ->
>> -        *         cpufreq_governor_userspace (lock userspace_mutex)
>> -        */
>>          ret = __cpufreq_driver_target(policy, freq, CPUFREQ_RELATION_L);
>> -
>>    err:
>>          mutex_unlock(&userspace_mutex);
>>          return ret;
>
> Looks fine:
>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
>

Thanks. I will send formal version.

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