linux-kernel - Re: [PATCH v1] thermal: trip: Rework thermal_zone_set

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Date:   Tue, 28 Nov 2023 13:15:21 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH v1] thermal: trip: Rework thermal_zone_set_trip() and its
 callers



On 11/28/23 12:57, Rafael J. Wysocki wrote:
> On Tue, Nov 28, 2023 at 1:53 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
>>
>> Hi Lukasz,
>>
>> On Tue, Nov 28, 2023 at 9:16 AM Lukasz Luba <lukasz.luba@....com> wrote:
>>>
>>> Hi Rafael,
>>>
>>> On 11/27/23 19:59, Rafael J. Wysocki wrote:
>>>> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>>>
> 
> [cut]
> 
>>>> Index: linux-pm/drivers/thermal/thermal_trip.c
>>>> ===================================================================
>>>> --- linux-pm.orig/drivers/thermal/thermal_trip.c
>>>> +++ linux-pm/drivers/thermal/thermal_trip.c
>>>> @@ -148,42 +148,61 @@ int thermal_zone_get_trip(struct thermal
>>>>    EXPORT_SYMBOL_GPL(thermal_zone_get_trip);
>>>>
>>>>    int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id,
>>>> -                       const struct thermal_trip *trip)
>>>> +                       enum thermal_set_trip_target what, const char *buf)
>>>>    {
>>>> -     struct thermal_trip t;
>>>> -     int ret;
>>>> +     struct thermal_trip *trip;
>>>> +     int val, ret = 0;
>>>>
>>>> -     if (!tz->ops->set_trip_temp && !tz->ops->set_trip_hyst && !tz->trips)
>>>> -             return -EINVAL;
>>>
>>> Here we could bail out when there are no callbacks.
>>
>> Not really, because the trip is updated regardless.
> 
> Actually, the condition above is always false after recent changes,
> because tz->trips[] is always present, so the if () statement is
> redundant.

Hmm, yes you're right. This is yet another sign to refactor the old
code.

For the rest of your comments in the earlier message - I agree.

When you post the v2 I can give it a try later today.

Regards,
Lukasz