linux-kernel - Re: [PATCH v1 07/17] thermal/hwmon: Use the thermal API instead tampering the internals

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Message-ID: <1c8efdae-1ef4-ab45-d891-72010d8a4343@linaro.org>
Date:   Mon, 20 Feb 2023 16:39:48 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, rafael@...nel.org
Subject: Re: [PATCH v1 07/17] thermal/hwmon: Use the thermal API instead
 tampering the internals

On 20/02/2023 15:11, Guenter Roeck wrote:
> On Mon, Feb 20, 2023 at 02:34:08PM +0100, Daniel Lezcano wrote:
>> Hi Guenter,
>>
>> my script should have Cc'ed you but it didn't, so just a heads up this patch
>> ;)
>>
>> On 19/02/2023 15:36, Daniel Lezcano wrote:
>>> In this function, there is a guarantee the thermal zone is registered.
>>>
>>> The sysfs hwmon unregistering will be blocked until we exit the
>>> function. The thermal zone is unregistered after the sysfs hwmon is
>>> unregistered.
>>>
>>> When we are in this function, the thermal zone is registered.
>>>
>>> We can call the thermal_zone_get_crit_temp() function safely and let
>>> the function use the lock which is private the thermal core code.
>>>
> 
> Hmm, if you say so. That very same call used to cause a crash in
> Chromebooks, which is why I had added the locking.

Mmh, I see. I guess we can assume thermal_hwmon is part of the core code 
and remove this change.


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