linux-kernel - Re: [BUG] [hwmon] linux 2.6.31-rc6 regression

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Date:	Sun, 16 Aug 2009 07:37:35 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Zeev Tarantov <zeev.tarantov@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] [hwmon] linux 2.6.31-rc6 regression

On Sun, Aug 16, 2009 at 02:03:03AM +0100, Matthew Garrett wrote:
> On Sat, Aug 15, 2009 at 01:29:48PM +0300, Zeev Tarantov wrote:
> 
> > [    3.276720] w83627ehf: Found W83627DHG chip at 0x290
> > [    3.276894] ACPI: I/O resource w83627ehf [0x295-0x296] conflicts
> > with ACPI region HWRE [0x290-0x299]
> > [    3.277171] ACPI: Device needs an ACPI driver
> 
> The hwmon driver is attempting to allocate a region that's also used by 
> your ACPI firmware. There's no way to synchronise access between the 
> kernel and the firmware, so allowing both is potentially racy - we've 
> seen numerous cases where the combination results in the system 
> incorrectly generating critical temperatuer shutdowns, for instance, 
> when some other indexed access gets interpreted as the temperature or 
> when the hwmon chip's state machine is confused. The failure of hwmon to 
> bind is a feature here, not a bug. You can override it with 
> acpi_enforce_resources=no on the kernel command line.

But we don't introduce »features« that break hardware monitoring on
numerous machines in rc6 normally, IIRC.
If this so important and critical to you, than just add a »hyperstrict«
parameter to acpi_enforce_resources or make »lax« the default.
-- 
Markus
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