Re: [Bugfix 1/2] ACPI, PCI, irq: Do not share PCI IRQ with ISA IRQ

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From	"Rafael J. Wysocki" <rjw@rjwysocki.net>
Newsgroups	linux.kernel
Subject	Re: [Bugfix 1/2] ACPI, PCI, irq: Do not share PCI IRQ with ISA IRQ
Date	Mon, 28 Sep 2015 15:40:04 +0200
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X-Original-To	Bjorn Helgaas <helgaas@kernel.org>
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X-Original-Cc	Jiang Liu <jiang.liu@linux.intel.com>, "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>, Bjorn Helgaas <bhelgaas@google.com>, Thomas Gleixner <tglx@linutronix.de>, Len Brown <lenb@kernel.org>, wfg@linux.intel.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, x86@kernel.org
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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 <jiang.liu@linux.intel.com>
> 
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>

Thanks!

Queued up both this and the [2/2] for 4.3-rc4.

Thanks,
Rafael

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Re: [Bugfix 1/2] ACPI, PCI, irq: Do not share PCI IRQ with ISA IRQ Bjorn Helgaas <helgaas@kernel.org> - 2015-09-26 01:50 +0200
  Re: [Bugfix 1/2] ACPI, PCI, irq: Do not share PCI IRQ with ISA IRQ "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-09-28 15:40 +0200

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