PCI Hotplug: pciehp: Dont check bridge control on remove

When removing a device with a bridge on it, only read the
bridge control register if the adapter is actually present.
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/hotplug/pciehp_pci.c

@@ -243,9 +243,10 @@ int pciehp_configure_device(struct slot *p_slot)
 
 int pciehp_unconfigure_device(struct slot *p_slot)
 {
-	int rc = 0;
+	int ret, rc = 0;
 	int j;
 	u8 bctl = 0;
+	u8 presence = 0;
 	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
 
 	dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus,
@@ -263,7 +264,11 @@ int pciehp_unconfigure_device(struct slot *p_slot)
 			continue;
 		}
 		if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
-			pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
+			ret = p_slot->hpc_ops->get_adapter_status(p_slot,
+								&presence);
+			if (!ret && presence) {
+				pci_read_config_byte(temp, PCI_BRIDGE_CONTROL,
+					&bctl);
 				if (bctl & PCI_BRIDGE_CTL_VGA) {
 					err("Cannot remove display device %s\n",
 						pci_name(temp));
@@ -271,6 +276,7 @@ int pciehp_unconfigure_device(struct slot *p_slot)
 					continue;
 				}
 			}
+		}
 		pci_remove_bus_device(temp);
 		pci_dev_put(temp);
 	}