linux-kernel - Re: [lm-sensors] Could the k8temp driver be interfering with ACPI?

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Message-ID: <20070302135810.GF2156@elf.ucw.cz>
Date:	Fri, 2 Mar 2007 14:58:10 +0100
From:	Pavel Machek <pavel@....cz>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Rudolf Marek <r.marek@...embler.cz>,
	linux-acpi@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	lm-sensors@...sensors.org
Subject: Re: [lm-sensors] Could the k8temp driver be interfering with ACPI?

On Fri 2007-03-02 11:47:47, Matthew Garrett wrote:
> On Fri, Mar 02, 2007 at 12:40:23PM +0100, Pavel Machek wrote:
> 
> > Whitelist seems like a way to go :(.
> 
> The DSDT code clearly can't touch the hardware itself - hardware access 
> is carried out by the kernel. If we can identify cases where ACPI reads 
> and writes would touch resources claimed by other drivers, that would be 
> a good starting point for working out what's going on.
> 
> Of course, this ignores the case where the DSDT just traps into SMM 
> code. That one is clearly unsolvable.

We can't solve SMM stuff. (Whitelist needed :-).

Actually for the acpi stuff... we might wrap ACPI interpretter with a
semaphore that needs to be taken before starting any AML code. Then
just make sure sensors take same semaphore?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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