From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262979AbVHERXG (ORCPT ); Fri, 5 Aug 2005 13:23:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263098AbVHERWe (ORCPT ); Fri, 5 Aug 2005 13:22:34 -0400 Received: from fmr18.intel.com ([134.134.136.17]:4487 "EHLO orsfmr003.jf.intel.com") by vger.kernel.org with ESMTP id S262979AbVHERUZ (ORCPT ); Fri, 5 Aug 2005 13:20:25 -0400 Subject: Re: [PATCH] 6700/6702PXH quirk From: Kristen Accardi To: Bjorn Helgaas Cc: linux-pci@atrey.karlin.mff.cuni.cz, linux-kernel@vger.kernel.org, greg@kroah.com, rajesh.shah@intel.com In-Reply-To: <200508051112.04652.bjorn.helgaas@hp.com> References: <1123259263.8917.9.camel@whizzy> <200508051112.04652.bjorn.helgaas@hp.com> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Fri, 05 Aug 2005 10:20:07 -0700 Message-Id: <1123262407.8917.19.camel@whizzy> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 (2.0.4-4) X-OriginalArrivalTime: 05 Aug 2005 17:20:08.0616 (UTC) FILETIME=[EDCB9280:01C599E1] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2005-08-05 at 11:12 -0600, Bjorn Helgaas wrote: > On Friday 05 August 2005 10:27 am, Kristen Accardi wrote: > > On the 6700/6702 PXH part, a MSI may get corrupted if an ACPI hotplug > > driver and SHPC driver in MSI mode are used together. This patch will > > prevent MSI from being enabled for the SHPC. > > Can you outline the scenario that causes the corruption? This patch > feels like a band-aid over a deeper problem. This is a workaround to a hardware problem. If a MSI interrupt occurs while the ACPI driver is doing a config read of the hotplug capabilities register, the MSI interrupt will be corrupted, and the MSI interrupt will never make it to the MCH. This causes the hotplug device to not be recognized.