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

Xen pciback driver assumes that pci_dev->irq won't change after calling
pci_disable_device(). But commit cffe0a2b5a34c95a4dadc9ec7132690a5b0f6687
("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 <jiang.liu@linux.intel.com>
Tested-by: Sander Eikelenboom <linux@eikelenboom.it>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>
Link: http://lkml.kernel.org/r/1421720467-7709-3-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index 5277a0ee57042b26cf78e6186a17899233801273..b1def411c0b89cbf7847b767063c5c2ab528e8a8 100644 (file)
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -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;
        }
 }