linux-kernel - Re: [PATCH 01/10] lis3lv02d: avoid divide by zero due to unchecked

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Message-Id: <201108012311.17881.chunkeey@googlemail.com>
Date:	Mon, 1 Aug 2011 23:11:17 +0200
From:	Christian Lamparter <chunkeey@...glemail.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Éric Piel <eric.piel@...mplin-utc.net>,
	Matthew Garrett <mjg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 01/10] lis3lv02d: avoid divide by zero due to unchecked

On Monday, August 01, 2011 10:29:06 PM Andrew Morton wrote:
> On Mon, 25 Jul 2011 17:16:23 +0200
> __ric Piel <eric.piel@...mplin-utc.net> wrote:
> 
> > +static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)
> > +{
> > +	int div = lis3lv02d_get_odr();
> > +
> > +	if (WARN_ONCE(div == 0, "device returned spurious data"))
> > +		return -ENXIO;
> > +
> > +	/* LIS3 power on delay is quite long */
> > +	msleep(lis3->pwron_delay / div);
> > +	return 0;
> > +}
> 
> The WARN_ONCE may not be very useful.  The user gets worried, might
> report it (often to a distro, not to you!).  But we won't actually *do*
> anything with the information?
The sensor is used to park the hdd in case of an "accident". However,
if the sensors is not working, the user should at least get a WARN
that something is very wrong, right?

Regards,
	Chr
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