linux-kernel - Re: [PATCH] PM / devfreq: Send the DEVFREQ_POSTCHANGE notification when target() is failed

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Date:	Thu, 23 Jun 2016 23:24:34 +0900
From:	Chanwoo Choi <cwchoi00@...il.com>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	Myungjoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Lin Huang <hl@...k-chips.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH] PM / devfreq: Send the DEVFREQ_POSTCHANGE notification
 when target() is failed

Hi,

2016-06-23 22:40 GMT+09:00 Rafael J. Wysocki <rafael@...nel.org>:
> On Thu, Jun 23, 2016 at 4:18 AM, Chanwoo Choi <cw00.choi@...sung.com> wrote:
>> This patch sends the DEVFREQ_POSTCHANGE notification when
>> devfreq->profile->targer() is failed. The PRECHANGE/POSTCHANGE
>> should be paired.
>>
>> Fixes: 0fe3a66410a3 ("PM / devfreq: Add new DEVFREQ_TRANSITION_NOTIFIER notifier")
>> Reported-by: Lin Huang <hl@...k-chips.com>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> ---
>>  drivers/devfreq/devfreq.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
>> index 1d6c803804d5..387799fec4c3 100644
>> --- a/drivers/devfreq/devfreq.c
>> +++ b/drivers/devfreq/devfreq.c
>> @@ -268,8 +268,11 @@ int update_devfreq(struct devfreq *devfreq)
>>         devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE);
>>
>>         err = devfreq->profile->target(devfreq->dev.parent, &freq, flags);
>> -       if (err)
>> +       if (err) {
>> +               freqs.new = cur_freq;
>> +               devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
>>                 return err;
>> +       }
>>
>>         freqs.new = freq;
>>         devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
>> --
>
> This looks like a fix for a recent regression, so I can apply it directly.
>
> Do you want me to do that?

Yes. Thanks for picking this patch up.

Regards,
Chanwoo Choi