Re: [Bugfix 1/2] ACPI, PCI, irq: Do not share PCI IRQ with ISA IRQ
From: Rafael J. Wysocki
Date: Mon Sep 28 2015 - 09:28:49 EST
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@xxxxxxxxxxxxxxx>
> Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Queued up both this and the [2/2] for 4.3-rc4.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/