diff --git a/sys/dev/acpica/acpi_container.c b/sys/dev/acpica/acpi_container.c
--- a/sys/dev/acpica/acpi_container.c
+++ b/sys/dev/acpica/acpi_container.c
@@ -38,7 +38,6 @@
 
 static int			acpi_syscont_probe(device_t);
 static int			acpi_syscont_attach(device_t);
-static int			acpi_syscont_detach(device_t);
 static int			acpi_syscont_alloc_msi(device_t, device_t,
 				    int count, int maxcount, int *irqs);
 static int			acpi_syscont_release_msi(device_t bus, device_t dev,
@@ -54,7 +53,7 @@
     /* Device interface */
     DEVMETHOD(device_probe,		acpi_syscont_probe),
     DEVMETHOD(device_attach,		acpi_syscont_attach),
-    DEVMETHOD(device_detach,		acpi_syscont_detach),
+    DEVMETHOD(device_detach,		bus_generic_detach),
 
     /* Bus interface */
     DEVMETHOD(bus_add_child,		bus_generic_add_child),
@@ -108,13 +107,6 @@
     return (bus_generic_attach(dev));
 }
 
-static int
-acpi_syscont_detach(device_t dev)
-{
-
-    return (bus_generic_detach(dev));
-}
-
 static int
 acpi_syscont_alloc_msi(device_t bus, device_t dev, int count, int maxcount,
     int *irqs)
diff --git a/sys/dev/adb/adb_bus.c b/sys/dev/adb/adb_bus.c
--- a/sys/dev/adb/adb_bus.c
+++ b/sys/dev/adb/adb_bus.c
@@ -42,7 +42,6 @@
 
 static int adb_bus_probe(device_t dev);
 static int adb_bus_attach(device_t dev);
-static int adb_bus_detach(device_t dev);
 static void adb_bus_enumerate(void *xdev);
 static void adb_probe_nomatch(device_t dev, device_t child);
 static int adb_print_child(device_t dev, device_t child);
@@ -57,7 +56,7 @@
 	/* Device interface */
 	DEVMETHOD(device_probe,		adb_bus_probe),
 	DEVMETHOD(device_attach,	adb_bus_attach),
-	DEVMETHOD(device_detach,        adb_bus_detach),
+	DEVMETHOD(device_detach,        bus_generic_detach),
         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
         DEVMETHOD(device_suspend,       bus_generic_suspend),
         DEVMETHOD(device_resume,        bus_generic_resume),
@@ -188,11 +187,6 @@
 	config_intrhook_disestablish(&sc->enum_hook);
 }
 
-static int adb_bus_detach(device_t dev)
-{
-	return (bus_generic_detach(dev));
-}
-
 static void
 adb_probe_nomatch(device_t dev, device_t child)
 {
diff --git a/sys/dev/mdio/mdio.c b/sys/dev/mdio/mdio.c
--- a/sys/dev/mdio/mdio.c
+++ b/sys/dev/mdio/mdio.c
@@ -59,14 +59,6 @@
 	return (bus_generic_attach(dev));
 }
 
-static int
-mdio_detach(device_t dev)
-{
-
-	bus_generic_detach(dev);
-	return (0);
-}
-
 static int
 mdio_readreg(device_t dev, int phy, int reg)
 {
@@ -108,7 +100,7 @@
 	DEVMETHOD(device_identify,	mdio_identify),
 	DEVMETHOD(device_probe,		mdio_probe),
 	DEVMETHOD(device_attach,	mdio_attach),
-	DEVMETHOD(device_detach,	mdio_detach),
+	DEVMETHOD(device_detach,	bus_generic_detach),
 	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
 
 	/* bus interface */