From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753135AbZHPBDF (ORCPT ); Sat, 15 Aug 2009 21:03:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751889AbZHPBDF (ORCPT ); Sat, 15 Aug 2009 21:03:05 -0400 Received: from cavan.codon.org.uk ([93.93.128.6]:50877 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751441AbZHPBDE (ORCPT ); Sat, 15 Aug 2009 21:03:04 -0400 Date: Sun, 16 Aug 2009 02:03:03 +0100 From: Matthew Garrett To: Zeev Tarantov Cc: linux-kernel@vger.kernel.org Subject: Re: [BUG] [hwmon] linux 2.6.31-rc6 regression Message-ID: <20090816010303.GA9588@srcf.ucam.org> References: <12d7e64c0908150329k1bf123der18e74112c5b9cd97@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <12d7e64c0908150329k1bf123der18e74112c5b9cd97@mail.gmail.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: mjg59@cavan.codon.org.uk X-SA-Exim-Scanned: No (on cavan.codon.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. -- Matthew Garrett | mjg59@srcf.ucam.org