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

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Date:	Mon, 7 Mar 2011 14:11:29 -0800
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	Greg Schnorr <gschnorr@...co.com>
CC:	Jean Delvare <khali@...ux-fr.org>,
	Jonathan Cameron <kernel@...23.retrosnub.co.uk>,
	Randy Dunlap <rdunlap@...otime.net>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] hwmon: (pmbus) More stringent checking of VOUT_MODE
 register

On Mon, Mar 07, 2011 at 04:44:43PM -0500, Greg Schnorr wrote:
> 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>
> 
Thanks!

Guenter
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