linux-kernel - Re: [PATCH 2/2] watchdog: s3c2410_wdt: Use devm_add_action_or

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Date:   Mon, 6 Mar 2023 07:23:29 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] watchdog: s3c2410_wdt: Use devm_add_action_or_reset()
 to disable watchdog

On 3/6/23 01:15, Uwe Kleine-König wrote:
> On Sat, Mar 04, 2023 at 08:56:53AM -0800, Guenter Roeck wrote:
>> Use devm_add_action_or_reset() to disable the watchdog when the driver
>> is removed to simplify the code. With this in place, we can use
>> devm_watchdog_register_device() to register the watchdog, and the removal
>> function is no longer necessary.
> 
> While the cleanup in this driver is good (
> Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> ) I wonder if disabling the watchdog at .remove() is right.
> 
> At least there is an inconsistency among watchdog drivers if the
> hardware is supposed to stop or not.
> 

Yes, it is, and it is one of those endless-argument things. Some driver
authors insist that the watchdog be stopped, some insist that it isn't.
That is why we have watchdog_stop_on_unregister().

Note I didn't use that here because the watchdog isn't stopped on unregister
but just disabled. That is slightly different, and I didn't want to change
functionality.

Guenter