linux-kernel - Re: [PATCH v2] acpi_power_meter: hwmon driver for ACPI 4.0 power meters

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Date:	Tue, 18 Aug 2009 09:24:05 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	lenb@...nel.org, linux-acpi@...r.kernel.org, rui.zhang@...el.com,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [PATCH v2] acpi_power_meter: hwmon driver for ACPI 4.0 power
	meters

On Mon, Aug 17, 2009 at 03:05:58PM -0700, Andrew Morton wrote:
> > +	if (ACPI_FAILURE(status)) {
> > +		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI"));
> > +		return -EINVAL;
> > +	}
> > +
> > +	if (data)
> > +		return -EINVAL;
> 
> I find this test of `data' inexplicable.  Is it just me, or do we need
> a comment here?

ACPI spec says that the _PAI method passes back 0 on success.  I guess I'll
reroll the patch with a comment stating that.

> > +	if (ACPI_FAILURE(status)) {
> > +		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL"));
> > +		return -EINVAL;
> > +	}
> > +
> > +	if (data)
> > +		return -EINVAL;
> 
> ditto.

Ditto.

--D
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