diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8878ccf..b0e2447 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -434,6 +434,9 @@
 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, struct pci_dev *dev);
 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass);
 
+void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
+		  void *userdata);
+
 /* kmem_cache style wrapper around pci_alloc_consistent() */
 
 #include <linux/dmapool.h>