linux-kernel - Re: [PATCH v2 1/7] thermal/drivers/intel_pch_thermal: Use thermal driver device to write a trace

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Date:   Tue, 11 Apr 2023 22:10:41 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     rui.zhang@...el.com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, Amit Kucheria <amitk@...nel.org>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Tim Zimmermann <tim@...ux4.de>
Subject: Re: [PATCH v2 1/7] thermal/drivers/intel_pch_thermal: Use thermal
 driver device to write a trace

On 11/04/2023 20:16, Rafael J. Wysocki wrote:
> On Mon, Apr 10, 2023 at 10:53 PM Daniel Lezcano
> <daniel.lezcano@...aro.org> wrote:
>>
>> The pch_critical() callback accesses the thermal zone device structure
>> internals, it dereferences the thermal zone struct device and the 'type'.
>>
>> For the former, the driver related device should be use instead and
>> for the latter an accessor already exists. Use them instead of
>> accessing the internals.
>>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>> ---
>>   drivers/thermal/intel/intel_pch_thermal.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/thermal/intel/intel_pch_thermal.c b/drivers/thermal/intel/intel_pch_thermal.c
>> index dce50d239357..0de46057db2a 100644
>> --- a/drivers/thermal/intel/intel_pch_thermal.c
>> +++ b/drivers/thermal/intel/intel_pch_thermal.c
>> @@ -127,7 +127,10 @@ static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
>>
>>   static void pch_critical(struct thermal_zone_device *tzd)
>>   {
>> -       dev_dbg(&tzd->device, "%s: critical temperature reached\n", tzd->type);
>> +       struct pch_thermal_device *ptd = thermal_zone_device_priv(tzd);
>> +
>> +       dev_dbg(&ptd->pdev->dev, "%s: critical temperature reached\n",
>> +               thermal_zone_device_type(tzd));
> 
> No, this just makes the code more complex than it is and the only
> reason seems to be "cleanliness".
> 
> Something like
> 
> thermal_zone_dbg(tzd, "critical temperature reached\n");
> 
> would work, the above doesn't.  Sorry.

Why not add a trace directly in handle_critical_trips() in 
thermal_core.c and remove this one ?


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