linux-kernel - Re: [PATCH 4/6] Watchdog: introdouce "pretimeout" into framework

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Message-ID: <20150515180105.GB19230@roeck-us.net>
Date:	Fri, 15 May 2015 11:01:05 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Fu Wei <fu.wei@...aro.org>
Cc:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Wei Fu <tekkamanninja@...il.com>,
	G Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, vgandhi@...eaurora.org,
	wim@...ana.be, Jon Masters <jcm@...hat.com>,
	Leo Duran <leo.duran@....com>, Jon Corbet <corbet@....net>
Subject: Re: [PATCH 4/6] Watchdog: introdouce "pretimeout" into framework

On Fri, May 15, 2015 at 09:49:07PM +0800, Fu Wei wrote:
> Hi Guenter,
> 
> Great thanks for your review,
> feedback inline below :-)
> 
> On 15 May 2015 at 21:33, Guenter Roeck <linux@...ck-us.net> wrote:

[ ... ]

> >> +       if (wdd->max_pretimeout && wdd->max_timeout < wdd->max_pretimeout)
> >> {
> >> +               pr_info("Invalid max timeout, resetting to max
> >> pretimeout!\n");
> >> +               wdd->max_timeout = wdd->max_pretimeout;
> >> +       }
> >
> >
> > I am a bit concerned about the context dependency introduced here. If
> > someone calls
> > _init_pretimeout after calling init_timeout, this may result in still
> > invalid timeout
> > values.
> 
> yes, that logic is not very clean, so my thought is :
> maybe we can integrate watchdog_init_timeout and watchdog_init_pretimeout,
> if maintainer agree to add pretimeout into framework.
> 
I think we should just assume that Wim will accept it, and try to find
the best possible solution (or at least a good one).

Guenter
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