linux-kernel - Re: [PATCH v2] thermal/drivers/sun8i: Fix some error handling paths in sun8i_ths

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Date:   Tue, 13 Jun 2023 10:49:24 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Ondřej Jirman <megi@....cz>,
        Maxime Ripard <maxime@...no.tech>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Yangtao Li <tiny.windzz@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH v2] thermal/drivers/sun8i: Fix some error handling paths
 in sun8i_ths_probe()

On 15/05/2023 14:33, Ondřej Jirman wrote:
> Hi Maxime,
> 
> On Mon, May 15, 2023 at 01:54:41PM +0200, Maxime Ripard wrote:
>> Hi,
>>
>> On Sun, May 14, 2023 at 08:46:05PM +0200, Christophe JAILLET wrote:
>>> Should an error occur after calling sun8i_ths_resource_init() in the probe
>>> function, some resources need to be released, as already done in the
>>> .remove() function.
>>>
>>> Switch to the devm_clk_get_enabled() helper and add a new devm_action to
>>> turn sun8i_ths_resource_init() into a fully managed function.
>>>
>>> Move the place where reset_control_deassert() is called so that the
>>> recommended order of reset release/clock enable steps is kept.
>>> A64 manual states that:
>>>
>>> 	3.3.6.4. Gating and reset
>>>
>>> 	Make sure that the reset signal has been released before the release of
>>> 	module clock gating;
>>>
>>> This fixes the issue and removes some LoC at the same time.
>>
>> It should really be three different patches:
>>   - One to fix the resource release, that can be backported to stable
>>     releases
>>   - One to switch to devm_clk_get_enabled
>>   - and one to change the order of clock enable vs reset deassertion
> 
> The order was correct before this patch. I don't think an incorrect order
> should be intorduced, even if temporarily between two patches.

Maxime ?

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