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

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Message-Id: <20110801132906.2d4cd28e.akpm@linux-foundation.org>
Date:	Mon, 1 Aug 2011 13:29:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Éric Piel <eric.piel@...mplin-utc.net>
Cc:	Matthew Garrett <mjg@...hat.com>,
	Christian Lamparter <chunkeey@...glemail.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 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?
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