diff --git a/sys/dev/usb/net/if_axge.c b/sys/dev/usb/net/if_axge.c
--- a/sys/dev/usb/net/if_axge.c
+++ b/sys/dev/usb/net/if_axge.c
@@ -507,10 +507,17 @@
 	mii = GET_MII(sc);
 	AXGE_LOCK_ASSERT(sc, MA_OWNED);
 
+	AXGE_UNLOCK(sc);
+	AXGE_MII_LOCK(sc);
+	AXGE_LOCK(sc);
+
 	LIST_FOREACH(miisc, &mii->mii_phys, mii_list)
 	    PHY_RESET(miisc);
 	error = mii_mediachg(mii);
 
+	AXGE_UNLOCK(sc);
+	AXGE_MII_UNLOCK(sc);
+	AXGE_LOCK(sc);
 	return (error);
 }
 
@@ -525,11 +532,13 @@
 
 	sc = if_getsoftc(ifp);
 	mii = GET_MII(sc);
+	AXGE_MII_LOCK(sc);
 	AXGE_LOCK(sc);
 	mii_pollstat(mii);
 	ifmr->ifm_active = mii->mii_media_active;
 	ifmr->ifm_status = mii->mii_media_status;
 	AXGE_UNLOCK(sc);
+	AXGE_MII_UNLOCK(sc);
 }
 
 /*
@@ -570,6 +579,7 @@
 
 	device_set_usb_desc(dev);
 	mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
+	sx_init(&sc->sc_mii_lock, "axgemii");
 
 	sc->sc_flags = USB_GET_DRIVER_INFO(uaa);
 
@@ -631,6 +641,7 @@
 	}
 	usbd_transfer_unsetup(sc->sc_xfer, AXGE_N_TRANSFER);
 	uether_ifdetach(ue);
+	sx_destroy(&sc->sc_mii_lock);
 	mtx_destroy(&sc->sc_mtx);
 
 	return (0);
@@ -768,7 +779,18 @@
 	mii = GET_MII(sc);
 	AXGE_LOCK_ASSERT(sc, MA_OWNED);
 
+	AXGE_UNLOCK(sc);
+	if (!AXGE_MII_TRYLOCK(sc)) {
+		AXGE_LOCK(sc);
+		return;
+	}
+	AXGE_LOCK(sc);
+
 	mii_tick(mii);
+
+	AXGE_UNLOCK(sc);
+	AXGE_MII_UNLOCK(sc);
+	AXGE_LOCK(sc);
 }
 
 static u_int
diff --git a/sys/dev/usb/net/if_axgereg.h b/sys/dev/usb/net/if_axgereg.h
--- a/sys/dev/usb/net/if_axgereg.h
+++ b/sys/dev/usb/net/if_axgereg.h
@@ -202,6 +202,7 @@
 struct axge_softc {
 	struct usb_ether	sc_ue;
 	struct mtx		sc_mtx;
+	struct sx		sc_mii_lock;
 	struct usb_xfer		*sc_xfer[AXGE_N_TRANSFER];
 
 	int			sc_flags;
@@ -214,3 +215,6 @@
 #define	AXGE_LOCK(_sc)			mtx_lock(&(_sc)->sc_mtx)
 #define	AXGE_UNLOCK(_sc)		mtx_unlock(&(_sc)->sc_mtx)
 #define	AXGE_LOCK_ASSERT(_sc, t)	mtx_assert(&(_sc)->sc_mtx, t)
+#define	AXGE_MII_LOCK(_sc)		sx_xlock(&(_sc)->sc_mii_lock)
+#define	AXGE_MII_UNLOCK(_sc)		sx_xunlock(&(_sc)->sc_mii_lock)
+#define	AXGE_MII_TRYLOCK(_sc)		sx_try_xlock(&(_sc)->sc_mii_lock)