1 files changed, 34 insertions, 9 deletions

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 23b599d6a9d5..e5425079cecd 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -648,11 +648,43 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C686_4,	quirk_vi
  * Some of the on-chip devices are actually '586 devices' so they are
  * listed here.
  */
+
+static int via_irq_fixup_needed = -1;
+
+/*
+ * As some VIA hardware is available in PCI-card form, we need to restrict
+ * this quirk to VIA PCI hardware built onto VIA-based motherboards only.
+ * We try to locate a VIA southbridge before deciding whether the quirk
+ * should be applied.
+ */
+static const struct pci_device_id via_irq_fixup_tbl[] = {
+        {
+                .vendor         = PCI_VENDOR_ID_VIA,
+                .device         = PCI_ANY_ID,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .class          = PCI_CLASS_BRIDGE_ISA << 8,
+                .class_mask     = 0xffff00,
+        },
+        { 0, },
+};
+
 static void quirk_via_irq(struct pci_dev *dev)
 {
         u8 irq, new_irq;
 
-        new_irq = dev->irq & 0xf;
+        if (via_irq_fixup_needed == -1)
+                via_irq_fixup_needed = pci_dev_present(via_irq_fixup_tbl);
+
+        if (!via_irq_fixup_needed)
+                return;
+
+        new_irq = dev->irq;
+
+        /* Don't quirk interrupts outside the legacy IRQ range */
+        if (!new_irq || new_irq > 15)
+                return;
+
         pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
         if (new_irq != irq) {
                 printk(KERN_INFO "PCI: VIA IRQ fixup for %s, from %d to %d\n",
@@ -661,14 +693,7 @@ static void quirk_via_irq(struct pci_dev *dev)
                 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, new_irq);
         }
 }
-DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_0, quirk_via_irq);
-DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1, quirk_via_irq);
-DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_2, quirk_via_irq);
-DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3, quirk_via_irq);
-DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235_USB_2, quirk_via_irq);
-DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686, quirk_via_irq);
-DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4, quirk_via_irq);
-DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_5, quirk_via_irq);
+DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_ANY_ID, quirk_via_irq);
 
 /*
  * VIA VT82C598 has its device ID settable and many BIOSes