linux-kernel - Re: [PATCH v2 5/7] Watchdog: introduce "pretimeout" into framework

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Date:	Thu, 21 May 2015 08:32:25 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	fu.wei@...aro.org
Cc:	Suravee.Suthikulpanit@....com, linaro-acpi@...ts.linaro.org,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	tekkamanninja@...il.com, graeme.gregory@...aro.org,
	al.stone@...aro.org, hanjun.guo@...aro.org, timur@...eaurora.org,
	ashwin.chaugule@...aro.org, arnd@...db.de, vgandhi@...eaurora.org,
	wim@...ana.be, jcm@...hat.com, leo.duran@....com, corbet@....net,
	mark.rutland@....com
Subject: Re: [PATCH v2 5/7] Watchdog: introduce "pretimeout" into framework

On Thu, May 21, 2015 at 04:32:34PM +0800, fu.wei@...aro.org wrote:
> From: Fu Wei <fu.wei@...aro.org>
> 
> Also update Documentation/watchdog/watchdog-kernel-api.txt to
> introduce:
> (1)the new elements in the watchdog_device and watchdog_ops struct;
> (2)the new API "watchdog_init_timeouts".
> 
> Reasons:
> (1)kernel already has two watchdog drivers are using "pretimeout":
> 	drivers/char/ipmi/ipmi_watchdog.c
> 	drivers/watchdog/kempld_wdt.c(but the definition is different)
> (2)some other dirvers are going to use this: ARM SBSA Generic Watchdog
> 
> Signed-off-by: Fu Wei <fu.wei@...aro.org>
> ---

[ ... ]

>  
> +/* Use the following function to check if a pretimeout value is invalid */
> +static inline bool watchdog_pretimeout_invalid(struct watchdog_device *wdd,
> +					       unsigned int t)
> +{
> +	return ((wdd->max_pretimeout != 0) &&
> +		(t < wdd->min_pretimeout || t > wdd->max_pretimeout));
> +}

Should this function also enforce "t < wdd->timeout", and
should watchdog_timeout_invalid() enforce "t > wdd->pretimeout" ?

Thanks,
Guenter
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