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ACPI: pci: Do not clear pci_dev->irq in acpi_pci_irq_disable()

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Xen pciback driver assumes that pci_dev->irq won't change after calling
pci_disable_device(). But commit cffe0a2b5a
("x86, irq: Keep balance of IOAPIC pin reference count") frees irq
resources and resets pci_dev->irq to zero when pci_disable_device() is
called.

So this is a hotfix for 3.19 to avoid resetting pci_dev->irq, and
another proper fix will be prepared for next merging window.

Signed-off-by: Jiang Liu <[email protected]>
Tested-by: Sander Eikelenboom <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: David Vrabel <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Len Brown <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Jiang Liu 2015-01-20 10:21:06 +08:00 • committed by Thomas Gleixner
commit 9889eaeb7c
1 changed files with 0 additions and 1 deletions
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1
drivers/acpi/pci_irq.c
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@ -512,7 +512,6 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
if (gsi >= 0) {
acpi_unregister_gsi(gsi);
dev->irq = 0;
dev->irq_managed = 0;
}
}