diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 1009a5e..aaf7ff8 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -207,6 +207,8 @@
 	pci_bar_mem64,		/* A 64-bit memory BAR */
 };
 
+bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *pl,
+				int crs_timeout);
 extern int pci_setup_device(struct pci_dev *dev);
 extern int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
 				struct resource *res, unsigned int reg);