linux-kernel - Re: [PATCH 3/5] thermal/core: Remove unneeded mutex

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Message-ID: <db701c97-883e-f231-68fa-c851c6a1a862@linaro.org>
Date:   Thu, 19 Jan 2023 10:30:37 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Zhang, Rui" <rui.zhang@...el.com>,
        "rafael@...nel.org" <rafael@...nel.org>
Cc:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "amitk@...nel.org" <amitk@...nel.org>
Subject: Re: [PATCH 3/5] thermal/core: Remove unneeded mutex_destroy()

On 19/01/2023 08:41, Zhang, Rui wrote:
> On Wed, 2023-01-18 at 22:11 +0100, Daniel Lezcano wrote:
>> If the thermal framework fails to initialize, the mutex can be used
>> by
>> the different functions registering a thermal zone anyway.
> 
> Hmm, even with no governors and unregistered thermal sysfs class?
> 
> IMO, thermal APIs for registering a thermal_zone/cooling_device should
> yield early if thermal_init fails.
> For other APIs that relies on a valid
> thermal_zone_device/thermal_cooling_device pointer, nothing needs to
> be changed.
> 
> what do you think?

I think you are right.

It would be nice if we can check if the thermal class is registered and 
bail out if not. But there is no function to check that AFAICS.

Alternatively we can convert the thermal class static structure to a 
pointer and set it to NULL in case of error in thermal_init() ?


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