linux-kernel - Re: [PATCH] thermal/drivers/cpufreq_cooling: Fix return of cpufreq_set_cur

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Date:   Tue, 24 Mar 2020 07:45:12 +0000
From:   Willy Wolff <willy.mh.wolff.ml@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Amit Kucheria <amit.kucheria@...durent.com>,
        Amit Daniel Kachhap <amit.kachhap@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Javi Merino <javi.merino@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Linux PM list <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Rafael J.Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH] thermal/drivers/cpufreq_cooling: Fix return of
 cpufreq_set_cur_state

Many thanks.

On Mon, Mar 23, 2020 at 10:08:38PM +0100, Daniel Lezcano wrote:
>On 23/03/2020 22:05, Amit Kucheria wrote:
>> Hi Willy,
>>
>> On Sat, Mar 21, 2020 at 2:57 PM Willy Wolff <willy.mh.wolff.ml@...il.com> wrote:
>>>
>>> The function freq_qos_update_request returns 0 or 1 describing update
>>> effectiveness, and a negative error code on failure. However,
>>> cpufreq_set_cur_state returns 0 on success or an error code otherwise.
>>>
>>
>> Please improve the commit message with context from your earlier bug
>> report thread and a summary of how the problem shows up.
>
>I've improved the commit message when applied:
>
>https://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux.git/commit/?h=testing&id=ff44f672d74178b3be19d41a169b98b3e391d4ce
>
>>> Signed-off-by: Willy Wolff <willy.mh.wolff.ml@...il.com>
>>> ---
>>>  drivers/thermal/cpufreq_cooling.c | 6 ++++--
>>>  1 file changed, 4 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c
>>> index fe83d7a210d4..af55ac08e1bd 100644
>>> --- a/drivers/thermal/cpufreq_cooling.c
>>> +++ b/drivers/thermal/cpufreq_cooling.c
>>> @@ -431,6 +431,7 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
>>>                                  unsigned long state)
>>>  {
>>>         struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
>>> +       int ret;
>>>
>>>         /* Request state should be less than max_level */
>>>         if (WARN_ON(state > cpufreq_cdev->max_level))
>>> @@ -442,8 +443,9 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
>>>
>>>         cpufreq_cdev->cpufreq_state = state;
>>>
>>> -       return freq_qos_update_request(&cpufreq_cdev->qos_req,
>>> -                               get_state_freq(cpufreq_cdev, state));
>>> +       ret = freq_qos_update_request(&cpufreq_cdev->qos_req,
>>> +                                     get_state_freq(cpufreq_cdev, state));
>>> +       return ret < 0 ? ret : 0;
>>>  }
>>>
>>>  /* Bind cpufreq callbacks to thermal cooling device ops */
>>> --
>>> 2.20.1
>>>
>
>
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