diff --git a/sys/dev/pci/if_bge.c b/sys/dev/pci/if_bge.c
index a562b3ced56d..8d7b1c42ee33 100644
--- a/sys/dev/pci/if_bge.c
+++ b/sys/dev/pci/if_bge.c
@@ -3997,6 +3997,7 @@ bge_attach(device_t parent, device_t self, void *aux)
 			mii_flags |= MIIF_HAVEFIBER;
 again:
 		bge_asf_driver_up(sc);
+		mutex_enter(sc->sc_intr_lock);
 		rv = bge_miibus_readreg(sc->bge_dev, sc->bge_phy_addr,
 		    MII_BMCR, &phyreg);
 		if ((rv != 0) || ((phyreg & BMCR_PDOWN) != 0)) {
@@ -4013,6 +4014,7 @@ again:
 				DELAY(1000);
 			}
 		}
+		mutex_exit(sc->sc_intr_lock);
 
 		mii_attach(sc->bge_dev, mii, capmask, sc->bge_phy_addr,
 		    MII_OFFSET_ANY, mii_flags);
@@ -5682,7 +5684,9 @@ bge_init(struct ifnet *ifp)
 		BGE_CLRBIT(sc, BGE_RX_MODE, BGE_RXMODE_RX_PROMISC);
 
 	/* Program multicast filter. */
+	mutex_enter(sc->sc_mcast_lock);
 	bge_setmulti(sc);
+	mutex_exit(sc->sc_mcast_lock);
 
 	/* Init RX ring. */
 	bge_init_rx_ring_std(sc);