diff --git a/sys/dev/usb/net/if_aue.c b/sys/dev/usb/net/if_aue.c
index 84268c60a780..3378ba9f2a56 100644
--- a/sys/dev/usb/net/if_aue.c
+++ b/sys/dev/usb/net/if_aue.c
@@ -692,6 +840,7 @@ aue_attach(device_t dev)
 
 	device_set_usb_desc(dev);
 	mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
+	sx_init(&sc->sc_mii_lock, "auemii");
 
 	iface_index = AUE_IFACE_IDX;
 	error = usbd_transfer_setup(uaa->device, &iface_index,
@@ -728,6 +877,7 @@ aue_detach(device_t dev)
 
 	usbd_transfer_unsetup(sc->sc_xfer, AUE_N_TRANSFER);
 	uether_ifdetach(ue);
+	sx_destroy(&sc->sc_mii_lock);
 	mtx_destroy(&sc->sc_mtx);
 
 	return (0);
@@ -930,6 +1080,13 @@ aue_tick(struct usb_ether *ue)
 
 	AUE_LOCK_ASSERT(sc, MA_OWNED);
 
+	AUE_UNLOCK(sc);
+	if (!AUE_MII_TRYLOCK(sc)) {
+		AUE_LOCK(sc);
+		return;
+	}
+	AUE_LOCK(sc);
+
 	mii_tick(mii);
 	if ((sc->sc_flags & AUE_FLAG_LINK) == 0
 	    && mii->mii_media_status & IFM_ACTIVE &&
@@ -937,6 +1094,9 @@ aue_tick(struct usb_ether *ue)
 		sc->sc_flags |= AUE_FLAG_LINK;
 		aue_start(ue);
 	}
+        AUE_UNLOCK(sc);
+        AUE_MII_UNLOCK(sc);
+        AUE_LOCK(sc);
 }
 
 static void
@@ -1015,10 +1175,19 @@ aue_ifmedia_upd(if_t ifp)
 
 	AUE_LOCK_ASSERT(sc, MA_OWNED);
 
+	AUE_UNLOCK(sc);
+	AUE_MII_LOCK(sc);
+	AUE_LOCK(sc);
+
         sc->sc_flags &= ~AUE_FLAG_LINK;
 	LIST_FOREACH(miisc, &mii->mii_phys, mii_list)
 		PHY_RESET(miisc);
 	error = mii_mediachg(mii);
+
+	AUE_UNLOCK(sc);
+	AUE_MII_UNLOCK(sc);
+	AUE_LOCK(sc);
+
 	return (error);
 }
 
@@ -1031,11 +1200,13 @@ aue_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr)
 	struct aue_softc *sc = if_getsoftc(ifp);
 	struct mii_data *mii = GET_MII(sc);
 
+	AUE_MII_LOCK(sc);
 	AUE_LOCK(sc);
 	mii_pollstat(mii);
 	ifmr->ifm_active = mii->mii_media_active;
 	ifmr->ifm_status = mii->mii_media_status;
 	AUE_UNLOCK(sc);
+	AUE_MII_UNLOCK(sc);
 }
 
 /*
diff --git a/sys/dev/usb/net/if_auereg.h b/sys/dev/usb/net/if_auereg.h
index 7f2d56dccdd5..bc1945626b73 100644
--- a/sys/dev/usb/net/if_auereg.h
+++ b/sys/dev/usb/net/if_auereg.h
@@ -204,8 +204,11 @@ struct aue_rxpkt {
 struct aue_softc {
 	struct usb_ether	sc_ue;
 	struct mtx		sc_mtx;
+	struct sx               sc_mii_lock;
 	struct usb_xfer	*sc_xfer[AUE_N_TRANSFER];
 
+	int                     sc_phyno;
+
 	int			sc_flags;
 #define	AUE_FLAG_LSYS		0x0001	/* use Linksys reset */
 #define	AUE_FLAG_PNA		0x0002	/* has Home PNA */
@@ -218,3 +221,6 @@ struct aue_softc {
 #define	AUE_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)
 #define	AUE_UNLOCK(_sc)		mtx_unlock(&(_sc)->sc_mtx)
 #define	AUE_LOCK_ASSERT(_sc, t)	mtx_assert(&(_sc)->sc_mtx, t)
+#define AUE_MII_LOCK(_sc)       sx_xlock(&(_sc)->sc_mii_lock)
+#define AUE_MII_UNLOCK(_sc)     sx_xunlock(&(_sc)->sc_mii_lock)
+#define	AUE_MII_TRYLOCK(_sc)    sx_try_xlock(&(_sc)->sc_mii_lock)