linux-kernel - Re: acerhdf thermal question

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Date:   Sat, 18 Feb 2023 00:18:47 +0000
From:   "Peter Kästle" <peter@...e.net>
To:     "Paul Gortmaker" <paul.gortmaker@...driver.com>,
        "Hans de Goede" <hdegoede@...hat.com>,
        "Daniel Lezcano" <daniel.lezcano@...aro.org>
Cc:     "Mark Gross" <markgross@...nel.org>,
        "open list:ACER ASPIRE ONE TEMPERATURE AND FAN DRIVER" 
        <platform-driver-x86@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: acerhdf thermal question

Hello,

16. Februar 2023 12:46, "Paul Gortmaker" <paul.gortmaker@...driver.com> schrieb:

> [Re: acerhdf thermal question] On 16/02/2023 (Thu 10:08) Hans de Goede wrote:
> 
>> Hi Daniel,
>> 
>> On 2/16/23 09:57, Daniel Lezcano wrote:
>> 
>> Hi,
>> 
>> the polling interval is specified and modified via a kernel module parameter [1]
>> 
>> The value is used to change the polling interval of the thermal zone, implying that is accessing
>> the thermal zone device structure internals directly [2]
>> 
>> In real use case, is the interval changed at runtime? Or just when the module is loaded? If the
>> latter, the interval can be passed to the thermal zone at init time without doing a polling change
>> rate after the thermal zone started. In this case, we can remove the polling_delay_jiffies change
>> in the code and fix the structure leakage in this driver.
>> 
>> I believe this very likely only is used at module load-time.
>> So the changes you suggest are fine with me.
>> 
>> I have added Paul Gortmaker to the Cc, Paul is the last person
>> to have done any real (*) work on acerhfd AFAICT.
>> 
>> Paul any objections against making the acerhdf.interval parameter
>> something which only works when set at boot / module load time
>> and removing the ability to change it at runtime ?
> 
> Not that I have any real authority, beyond "touched it last", but
> that aside, I'd say that if it is blocking other subsystem cleanups,
> then by all means make it load-time only.
> 
> It was already obsolete hardware when I was tinkering with it, and
> to my surprise -- that was already five years ago! There can't be a
> large user base out there - and even less tinkering with poll delay.

At least I'm still using it :)  Setting the interval at module load-time is good enough.

-- 
Thanks,
--peter;