From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933781AbbI1N2r (ORCPT ); Mon, 28 Sep 2015 09:28:47 -0400 Received: from v094114.home.net.pl ([79.96.170.134]:46994 "HELO v094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S933643AbbI1N2p (ORCPT ); Mon, 28 Sep 2015 09:28:45 -0400 From: "Rafael J. Wysocki" To: Bjorn Helgaas Cc: Jiang Liu , "Rafael J . Wysocki" , Bjorn Helgaas , Thomas Gleixner , Len Brown , wfg@linux.intel.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, x86@kernel.org Subject: Re: [Bugfix 1/2] ACPI, PCI, irq: Do not share PCI IRQ with ISA IRQ Date: Mon, 28 Sep 2015 15:57:03 +0200 Message-ID: <3135859.72R7vY9K7x@vostro.rjw.lan> User-Agent: KMail/4.11.5 (Linux/4.1.0-rc5+; KDE/4.11.5; x86_64; ; ) In-Reply-To: <20150925234040.GB23134@localhost> References: <1442469766-31264-1-git-send-email-jiang.liu@linux.intel.com> <20150925234040.GB23134@localhost> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Friday, September 25, 2015 06:40:40 PM Bjorn Helgaas wrote: > On Thu, Sep 17, 2015 at 02:02:45PM +0800, Jiang Liu wrote: > > Avoid IRQs occupied by ISA IRQs when allocating IRQs for PCI link devices, > > otherwise it may cause interrupt storm due to incompatible pin attributes. > > > > This issue was triggered on a KVM virtual machine, which > > 1) uses IRQ9 for SCI in high level mode. > > 2) defines an PCI interrupt link device (LNKS) with IRQ9 as the only > > possible irq. > > 3) has an PCI device referring to link device LNKS. > > So it causes interrupt storm when enabling the PCI device because PCI IRQ > > works in low level mode. > > > > Signed-off-by: Jiang Liu > > Acked-by: Bjorn Helgaas Thanks! Queued up both this and the [2/2] for 4.3-rc4. Thanks, Rafael