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

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Message-ID: <20090816144107.GA8165@srcf.ucam.org>
Date:	Sun, 16 Aug 2009 15:41:07 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	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 04:39:35PM +0200, Stefan Richter wrote:
> Matthew Garrett wrote:
>> On Sun, Aug 16, 2009 at 07:37:35AM +0200, Markus Trippelsdorf wrote:
>>> On Sun, Aug 16, 2009 at 02:03:03AM +0100, Matthew Garrett wrote:
>>>> 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.
>>
>> It's not - 2.6.29 had this behaviour, and it got broken in 2.6.30. This 
>> restores the status quo.
>
> Then why did my 2.6.29 did _not_ have this behavior?
> (here: ASUS M3A78-EM, it87 driver)

Some other bug?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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