linux-kernel - Re: [PATCH] PM / OPP: Implement free_opp

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Date:	Fri, 16 May 2014 22:38:50 +0530
From:	Inderpal Singh <inderpal.s@...sung.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nishanth Menon <nm@...com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Pavel Machek <pavel@....cz>
Subject: Re: [PATCH] PM / OPP: Implement free_opp_table function

Hi Viresh,

Thanks for the review.

On Fri, May 16, 2014 at 3:36 PM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> On 16 May 2014 14:39, Inderpal Singh <inderpal.s@...sung.com> wrote:
>> diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
>> +void dev_pm_opp_free_opp_table(struct device *dev)
>> +{
>> +       struct device_opp *dev_opp = NULL;
>> +       struct dev_pm_opp *opp;
>> +
>> +       /* Hold our list modification lock here */
>> +       mutex_lock(&dev_opp_list_lock);
>> +
>> +       /* Check for existing list for 'dev' */
>> +       dev_opp = find_device_opp(dev);
>> +       if (IS_ERR(dev_opp)) {
>> +               mutex_unlock(&dev_opp_list_lock);
>> +               return;
>> +       }
>> +
>> +       while (!list_empty(&dev_opp->opp_list)) {
>> +               opp = list_entry_rcu(dev_opp->opp_list.next,
>> +                                       struct dev_pm_opp, node);
>
> list_for_each_entry_rcu ?
>

list_for_each_entry_rcu can not be used as opp is being deleted in the loop.

Thanks,
Inder

>> +               list_del_rcu(&opp->node);
>> +               kfree_rcu(opp, head);
>> +       }
>> +
>> +       list_del_rcu(&dev_opp->node);
>> +       mutex_unlock(&dev_opp_list_lock);
>> +       synchronize_rcu();
>> +       kfree(dev_opp);
>> +}
>> +EXPORT_SYMBOL_GPL(dev_pm_opp_free_opp_table);
>>  #endif
>> diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
>> index 0330217..3c29620 100644
>> --- a/include/linux/pm_opp.h
>> +++ b/include/linux/pm_opp.h
>> @@ -50,6 +50,8 @@ int dev_pm_opp_enable(struct device *dev, unsigned long freq);
>>  int dev_pm_opp_disable(struct device *dev, unsigned long freq);
>>
>>  struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev);
>> +
>> +void dev_pm_opp_free_opp_table(struct device *dev);
>>  #else
>>  static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
>>  {
>> @@ -105,6 +107,10 @@ static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
>>  {
>>         return ERR_PTR(-EINVAL);
>>  }
>> +
>> +void dev_pm_opp_free_opp_table(struct device *dev)
>> +{
>> +}
>>  #endif         /* CONFIG_PM_OPP */
>>
>>  #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
>
> Otherwise looks fine.
> --
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