diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c
index 9424e401dbc7..38c0da2492c0 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.c
+++ b/drivers/net/dsa/mv88e6xxx/serdes.c
@@ -646,10 +646,12 @@ static irqreturn_t mv88e6390_serdes_thread_fn(int irq, void *dev_id)
 	int err;
 	u8 lane;
 
-	mv88e6xxx_serdes_get_lane(chip, port->port, &lane);
-
 	mv88e6xxx_reg_lock(chip);
 
+	err = mv88e6xxx_serdes_get_lane(chip, port->port, &lane);
+	if (err)
+		goto out;
+
 	switch (cmode) {
 	case MV88E6XXX_PORT_STS_CMODE_SGMII:
 	case MV88E6XXX_PORT_STS_CMODE_1000BASEX: