linux-kernel - Re: [PATCH v5 5/7] watchdog: f71808e_wdt: migrate to new kernel watchdog API

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Message-ID: <20210828161248.GA822720@roeck-us.net>
Date:   Sat, 28 Aug 2021 09:12:48 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: Re: [PATCH v5 5/7] watchdog: f71808e_wdt: migrate to new kernel
 watchdog API

On Mon, Aug 09, 2021 at 06:20:35PM +0200, Ahmad Fatoum wrote:
> Migrating the driver lets us drop the watchdog misc device boilerplate
> and reduces size by 285 lines. It also brings us support for new
> functionality like CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED.
> 
> This incurs a slight backwards-compatibility break, because the new
> kernel watchdog API doesn't support unloading modules for drivers
> whose watchdog hardware is reported to be running.
> 
> This means following scenario will be no longer supported:
>  - BIOS has enabled watchdog
>  - Module is loaded and unloaded without opening watchdog
>  - module_exit is expected to succeed and disable watchdog HW
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>