diff --git a/sys/dev/gpio/gpiomdio.c b/sys/dev/gpio/gpiomdio.c
--- a/sys/dev/gpio/gpiomdio.c
+++ b/sys/dev/gpio/gpiomdio.c
@@ -213,7 +213,6 @@
 	/* Device interface */
 	DEVMETHOD(device_probe,		gpiomdio_probe),
 	DEVMETHOD(device_attach,	gpiomdio_attach),
-	DEVMETHOD(device_detach,	bus_generic_detach),
 
 	/* MDIO interface */
 	DEVMETHOD(miibus_readreg,	gpiomdio_readreg),
diff --git a/sys/dev/sff/sfp_fdt.c b/sys/dev/sff/sfp_fdt.c
--- a/sys/dev/sff/sfp_fdt.c
+++ b/sys/dev/sff/sfp_fdt.c
@@ -138,7 +138,6 @@
 	/* Device interface */
 	DEVMETHOD(device_probe,		sfp_fdt_probe),
 	DEVMETHOD(device_attach,	sfp_fdt_attach),
-	DEVMETHOD(device_detach,	bus_generic_detach),
 
 	/* SFF */
 	DEVMETHOD(sff_get_i2c_bus,	sfp_fdt_get_i2c_bus),