linux-kernel - Re: [PATCH] hwmon: (pmbus) More stringent checking of VOUT

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Date:	Mon, 07 Mar 2011 13:44:43 -0800
From:	Greg Schnorr <gschnorr@...co.com>
To:	Guenter Roeck <guenter.roeck@...csson.com>,
	Jean Delvare <khali@...ux-fr.org>
CC:	Jonathan Cameron <kernel@...23.retrosnub.co.uk>,
	Randy Dunlap <rdunlap@...otime.net>,
	<lm-sensors@...sensors.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] hwmon: (pmbus) More stringent checking of VOUT_MODE
 register

Looks good, tested and works on one such VOUT_MODE poor design...

On 3/1/11 9:32 PM, "Guenter Roeck" <guenter.roeck@...csson.com> wrote:

> Some PMBus chips do not support the VOUT_MODE register. To make matters worse,
> such chips may not return an error when reading the register either, but
> instead
> return 0xff.
> 
> Check if the register exists using pmbus_check_byte_register() before reading
> its value. In addition, validate the returned value and ignore it if it is
> 0xff
> (which is invalid).
> 
> Reported-by: Greg Schnorr <gschnorr@...co.com>
> Signed-off-by: Guenter Roeck <guenter.roeck@...csson.com>
Acked-by: Greg Schnorr <gschnorr@...co.com>

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