linux-kernel - Re: [PATCH v6 1/6] thermal: add generic cpufreq cooling implementation

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Date:	Fri, 21 Sep 2012 11:23:47 +0900
From:	jonghwa3.lee@...sung.com
To:	Amit Daniel Kachhap <amit.kachhap@...aro.org>
Cc:	linux-pm@...ts.linux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Zhang Rui <rui.zhang@...el.com>, Len Brown <lenb@...nel.org>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [PATCH v6 1/6] thermal: add generic cpufreq cooling implementation

Hi, Amit,
On 2012Гт 08Пљ 16РЯ 20:41, Amit Daniel Kachhap wrote:

>  diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
>  new file mode 100644
>  index 0000000..66cbd52
>  --- /dev/null
>  +++ b/drivers/thermal/cpu_cooling.c
>  @@ -0,0 +1,586 @@

>  +/**
>  + * cpufreq_cooling_register - function to create cpufreq cooling device.
>  + * @clip_cpus: cpumask of cpus where the frequency constraints will happen.
>  + */
>  +struct thermal_cooling_device *cpufreq_cooling_register(
>  +       struct cpumask *clip_cpus)
>  +{
>  +       struct thermal_cooling_device *cool_dev;
>  +       struct cpufreq_cooling_device *cpufreq_dev = NULL;
>  +       unsigned int cpufreq_dev_count = 0, min = 0, max = 0;
>  +       char dev_name[THERMAL_NAME_LENGTH];
>  +       int ret = 0, id = 0, i;
>  +       struct cpufreq_policy policy;
>  +       ret = get_idr(&cpufreq_idr,&cpufreq_dev->id);
>  +       if (ret) {
>  +               kfree(cpufreq_dev);
>  +               return ERR_PTR(-EINVAL);
>  +       }
>  +
>  +       sprintf(dev_name, "thermal-cpufreq-%d", cpufreq_dev->id);
>  +
>  +       cool_dev = thermal_cooling_device_register(dev_name, cpufreq_dev,
>  +&cpufreq_cooling_ops);
>  +       if (!cool_dev) {
>  +               release_idr(&cpufreq_idr, cpufreq_dev->id);
>  +               kfree(cpufreq_dev);
>  +               return ERR_PTR(-EINVAL);
>  +       }
>  +       cpufreq_dev->id = id;


Why is this needed? Should every cpufreq_dev instance's id be same for
zero? It looks odd. And it also has problem which can be occurred when
it release id during unregistering cpufreq_dev. I think it should keep
the idr value taken before.


>  1.7.1
>
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