- Do not reinitialize the card if it is already running.

This fixes bootp on if_smc, as bootp code perform SIOCSIFADDR
  ioctl call immediately after sending the request (which causes
  if_init being called) which causes the adapter to drop all the
  packets received in the meantime.

sys/dev/smc/if_smc.c

@@ -1237,9 +1237,10 @@ smc_init_locked(struct smc_softc *sc)
 {
 	struct ifnet	*ifp;
 
-	ifp = sc->smc_ifp;
-
 	SMC_ASSERT_LOCKED(sc);
+	ifp = sc->smc_ifp;
+	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
+		return;
 
 	smc_reset(sc);
 	smc_enable(sc);