diff --git a/sys/compat/linuxkpi/common/include/linux/pci.h b/sys/compat/linuxkpi/common/include/linux/pci.h
--- a/sys/compat/linuxkpi/common/include/linux/pci.h
+++ b/sys/compat/linuxkpi/common/include/linux/pci.h
@@ -260,6 +260,7 @@
 
 struct pci_bus {
 	struct pci_dev	*self;
+	/* struct pci_bus	*parent */
 	int		domain;
 	int		number;
 };
@@ -1411,6 +1412,29 @@
 {
 }
 
+static inline int
+pci_rescan_bus(struct pci_bus *pbus)
+{
+	device_t *devlist, parent;
+	int devcount, error;
+
+	if (!device_is_attached(pbus->self->dev.bsddev))
+		return (0);
+	/* pci_rescan_method() will work on the pcib (parent). */
+	error = BUS_RESCAN(pbus->self->dev.bsddev);
+	if (error != 0)
+		return (0);
+
+	parent = device_get_parent(pbus->self->dev.bsddev);
+	error = device_get_children(parent, &devlist, &devcount);
+	if (error != 0)
+		return (0);
+	if (devcount != 0)
+		free(devlist, M_TEMP);
+
+	return (devcount);
+}
+
 /*
  * The following functions can be used to attach/detach the LinuxKPI's
  * PCI device runtime. The pci_driver and pci_device_id pointer is