linux-kernel - Re: [patch 1/1] watchdog driver for Digital-Logic MSM-P5XEN PC104 unit

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Message-ID: <20061101195208.GC7056@infomag.infomag.iguana.be>
Date:	Wed, 1 Nov 2006 20:52:08 +0100
From:	Wim Van Sebroeck <wim@...ana.be>
To:	ggaleotti@...erfree.it
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/1] watchdog driver for Digital-Logic MSM-P5XEN PC104 unit

Hi Gabriele,

> A simple watchdog driver for Digital-Logic's MSM-P5XEN PC104 unit.
> The watchdog is a LTC1232 controlled by a single I/O port @ 0x1037.
> The watchdog must be refreshed (writing a single byte) to the device
> at least every 600 msecs (which is a little of overhead, but PC104
> industrial applications requires a high degree of safety/reliability.)

I was looking at your code and have a question:
> +static void
> +wdt_ping(void)
> +{
> +	/*
> +	 * Clear-pulse trailing edge scheduling.
> +	 *
> +	 * We use mod_timer() rather than add_timer() because a timer could
> +	 * be already activated.
> +	 * kernel/timer.c:
> +	 * "... since add_timer() cannot modify an already running timer."
> +	 */
> +	mod_timer(&wdt_timer, jiffies + (HZ / 10));
> +
> +	wdt_disable();
> +}

Shouldn't this be wdt_enable();?
Please clarify.

Thanks,
Wim.

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