linux-kernel - Re: [PATCH 7/10 v2] Generic Watchdog Timer Driver

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Date:	Sat, 18 Jun 2011 21:07:45 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Wim Van Sebroeck <wim@...ana.be>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linux Watchdog Mailing List <linux-watchdog@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 7/10 v2] Generic Watchdog Timer Driver

On Saturday 18 June 2011 19:25:37 Wim Van Sebroeck wrote:
> diff -urN linux-2.6.38-generic-part6/Documentation/watchdog/src/watchdog-with-timer-example.c linux-2.6.38-generic-part7/Documentation/watchdog/src/watchdog-with-timer-example.c
> --- linux-2.6.38-generic-part6/Documentation/watchdog/src/watchdog-with-timer-example.c 2011-06-16 21:04:06.283940741 +0200
> +++ linux-2.6.38-generic-part7/Documentation/watchdog/src/watchdog-with-timer-example.c 2011-06-17 09:52:32.866632635 +0200
> @@ -45,6 +45,11 @@
>  MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. "
>         "(default = " __MODULE_STRING(WDT_TIMEOUT) ")");
>  
> +static int nowayout = WATCHDOG_NOWAYOUT;
> +module_param(nowayout, int, 0);
> +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started. "
> +       "(default = " __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> +
>  static struct watchdog_device wdt_dev;
>  static void wdt_timer_tick(unsigned long data);
>  static DEFINE_TIMER(timer, wdt_timer_tick, 0, 0);
> @@ -152,6 +157,8 @@
>  
>         /* Set watchdog_device parameters */
>         wdt_dev.timeout = timeout;
> +       if (nowayout)
> +               set_bit(WDOG_NO_WAY_OUT, &wdt_dev.status);
>  
>         /* Register the watchdog timer device */
>         res = watchdog_register_device(&wdt_dev);

Why is this a feature of the individual drivers and not of the core?

Maybe it can be in both, so existing drivers don't need to change the user
interface, but new drivers don't have to provide the option individually
when you can simply set it for the base module.

	Arnd
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