diff --git a/sys/arm/allwinner/aw_mmc.c b/sys/arm/allwinner/aw_mmc.c
--- a/sys/arm/allwinner/aw_mmc.c
+++ b/sys/arm/allwinner/aw_mmc.c
@@ -482,7 +482,6 @@
 aw_mmc_detach(device_t dev)
 {
 	struct aw_mmc_softc *sc;
-	device_t d;
 
 	sc = device_get_softc(dev);
 
@@ -494,12 +493,7 @@
 
 	callout_drain(&sc->aw_timeoutc);
 
-	AW_MMC_LOCK(sc);
-	d = sc->child;
-	sc->child = NULL;
-	AW_MMC_UNLOCK(sc);
-	if (d != NULL)
-		device_delete_child(sc->aw_dev, d);
+	device_delete_children(sc->aw_dev);
 
 	aw_mmc_teardown_dma(sc);
 
diff --git a/sys/arm64/broadcom/genet/if_genet.c b/sys/arm64/broadcom/genet/if_genet.c
--- a/sys/arm64/broadcom/genet/if_genet.c
+++ b/sys/arm64/broadcom/genet/if_genet.c
@@ -365,10 +365,7 @@
 gen_destroy(struct gen_softc *sc)
 {
 
-	if (sc->miibus) {	/* can't happen */
-		device_delete_child(sc->dev, sc->miibus);
-		sc->miibus = NULL;
-	}
+	device_delete_children(sc->dev);
 	bus_teardown_intr(sc->dev, sc->res[_RES_IRQ1], sc->ih);
 	bus_teardown_intr(sc->dev, sc->res[_RES_IRQ2], sc->ih2);
 	gen_bus_dma_teardown(sc);
diff --git a/sys/dev/intpm/intpm.c b/sys/dev/intpm/intpm.c
--- a/sys/dev/intpm/intpm.c
+++ b/sys/dev/intpm/intpm.c
@@ -202,8 +202,7 @@
 {
 	struct intsmb_softc *sc = device_get_softc(dev);
 
-	if (sc->smbus)
-		device_delete_child(dev, sc->smbus);
+	device_delete_children(dev);
 	if (sc->irq_hand)
 		bus_teardown_intr(dev, sc->irq_res, sc->irq_hand);
 	if (sc->irq_res)