diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 70f196f..3b0bb32 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -472,11 +472,9 @@
  */
 static void __devinit quirk_vt82c586_acpi(struct pci_dev *dev)
 {
-	u8 rev;
 	u32 region;
 
-	pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
-	if (rev & 0x10) {
+	if (dev->revision & 0x10) {
 		pci_read_config_dword(dev, 0x48, &region);
 		region &= PCI_BASE_ADDRESS_IO_MASK;
 		quirk_io_region(dev, region, 256, PCI_BRIDGE_RESOURCES, "vt82c586 ACPI");