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

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Message-ID: <3135859.72R7vY9K7x@vostro.rjw.lan>
Date:	Mon, 28 Sep 2015 15:57:03 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Bjorn Helgaas <helgaas@...nel.org>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <lenb@...nel.org>, wfg@...ux.intel.com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, x86@...nel.org
Subject: Re: [Bugfix 1/2] ACPI, PCI, irq: Do not share PCI IRQ with ISA IRQ

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@...ux.intel.com>
> 
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

Thanks!

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

Thanks,
Rafael

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