linux-kernel - Re: [PATCH Resend] cpufreq: Set cpufreq_cpu

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Date:	Mon, 02 Feb 2015 12:06:02 +0800
From:	ethan zhao <ethan.zhao@...cle.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	Rafael Wysocki <rjw@...ysocki.net>,
	santosh shilimkar <santosh.shilimkar@...cle.com>,
	Linaro Kernel Mailman List <linaro-kernel@...ts.linaro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH Resend] cpufreq: Set cpufreq_cpu_data to NULL before putting
 kobject



On 2015/2/2 11:59, Viresh Kumar wrote:
> On 2 February 2015 at 09:26, ethan zhao <ethan.zhao@...cle.com> wrote:
>>   How to prevent the policy to be freed between
>>
>> cpufreq_cpu_get()  and cpufreq_cpu_put() ?
> kobject_get() increases the reference count of a policy and the policy
> will only be freed when this is zero. And it will only be zero once all
> cpufreq_cpu_get() are matched with corresponding cpufreq_cpu_put().
  Is that an idea it supposed to be or fact ?

if (!cpufreq_suspended)
             cpufreq_policy_free(policy);

  static void cpufreq_policy_free(struct cpufreq_policy *policy)
{
     free_cpumask_var(policy->related_cpus);
     free_cpumask_var(policy->cpus);
     kfree(policy);
}

  It seems you just think about it ideally in mind.

  Thanks,
  Ethan
>
>> You are maxing up the water with sand ?
> :)

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