linux-kernel - Re: [PATCH 4.19 025/361] ACPICA: AML interpreter: add region addresses in global list during initialization

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Message-ID: <04e2dacd-7425-56e6-61e9-54c2a1d6c888@applied-asynchrony.com>
Date:   Mon, 12 Nov 2018 21:03:25 +0100
From:   Holger Hoffstätte <holger@...lied-asynchrony.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Jean-Marc Lenoir <archlinux@...emel.com>,
        Erik Schmauss <erik.schmauss@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH 4.19 025/361] ACPICA: AML interpreter: add region
 addresses in global list during initialization

On 11/12/18 8:25 PM, Greg Kroah-Hartman wrote:
> On Mon, Nov 12, 2018 at 07:30:57PM +0100, Holger Hoffstätte wrote:
>> On 11/11/18 11:16 PM, Greg Kroah-Hartman wrote:
>>> 4.19-stable review patch.  If anyone has any objections, please let me know.
>>
>> As probably expected this patch causes problems. In my case one server
>> can no longer load the nct6775 hwmon module, which means the fan cannot be
>> monitored, and therefore my monitoring system promptly starts spamming me with
>> alerts that my fan has failed - which is of course not true.
>>
>> --snip--
>> Nov 12 18:08:56 tux kernel: nct6775: Found NCT6776D/F or compatible chip at 0x2e:0x290
>> Nov 12 18:08:56 tux kernel: ACPI Warning: SystemIO range 0x0000000000000295-0x0000000000000296 conflicts with OpRegion 0x0000000000000290-0x
>> Nov 12 18:08:56 tux kernel: ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
>> --snip--
>>
>> This is certainly caused by my old BIOS and its broken ACPI implementation,
>> however since it's working perfectly fine otherwise I see no reason to replace
>> it. That being said, I must be able to monitor my fan, so for now reverting
>> the patch immediately "fixed" the problem for me - the fan entries appeared
>> in sysfs again after successfully loading the module.
>>
>> Idea, workarounds or patches welcome.
> 
> So Linus's tree is also "broken" for your hardware?

Not tested yet (should I?) but I assume it will be, since it seems to be my
old BIOS' ACPI implemnetation's fault. As I wrote to Erik, I just added
acpi_enforce_resources=lax to the boot flags, and as expected it gives a
warning for the hwmon module, but still lets it pass and work, as before
or with the patch reverted. So I'm good for now.

thanks,
Holger