Index: sys/dev/intel/spi.c
===================================================================
--- sys/dev/intel/spi.c
+++ sys/dev/intel/spi.c
@@ -124,6 +124,7 @@
 struct intelspi_softc {
 	ACPI_HANDLE		sc_handle;
 	device_t		sc_dev;
+	device_t		sc_child;
 	struct mtx		sc_mtx;
 	int			sc_mem_rid;
 	struct resource		*sc_mem_res;
@@ -468,7 +469,7 @@
 
 	intelspi_init(sc);
 
-	device_add_child(dev, "spibus", -1);
+	sc->sc_child = device_add_child(dev, "spibus", -1);
 
 	return (bus_generic_attach(dev));
 
@@ -495,6 +496,9 @@
 
 	INTELSPI_LOCK_DESTROY(sc);
 
+	if (sc->sc_child != NULL)
+		device_delete_child(dev, sc->sc_child);
+
 	if (sc->sc_irq_ih)
 		bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_irq_ih);