From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Jiang Liu To: Thomas Gleixner , Ingo Molnar , Konrad Rzeszutek Wilk , Sander Eikelenboom , David Vrabel , "Rafael J. Wysocki" , Len Brown Cc: Jiang Liu , Tony Luck , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org Subject: [Bugfix 1/3] xen/irq, ACPI: Fix regression in xen PCI passthrough caused by cffe0a2b5a34 Date: Mon, 19 Jan 2015 12:55:42 +0800 Message-Id: <1421643344-17092-2-git-send-email-jiang.liu@linux.intel.com> In-Reply-To: <1421643344-17092-1-git-send-email-jiang.liu@linux.intel.com> References: <1421643344-17092-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-acpi-owner@vger.kernel.org List-ID: 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 --- drivers/acpi/pci_irq.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c index 5277a0ee5704..b1def411c0b8 100644 --- 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; } } -- 1.7.10.4