diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index cc7ce06b6d58..3f9a3fc52a0e 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -480,7 +480,7 @@ static int mv88e6xxx_irq_poll_setup(struct mv88e6xxx_chip *chip)
 	kthread_init_delayed_work(&chip->irq_poll_work,
 				  mv88e6xxx_irq_poll);
 
-	chip->kworker = kthread_create_worker(0, dev_name(chip->dev));
+	chip->kworker = kthread_create_worker(0, "%s", dev_name(chip->dev));
 	if (IS_ERR(chip->kworker))
 		return PTR_ERR(chip->kworker);
 
diff --git a/drivers/net/dsa/mv88e6xxx/ptp.c b/drivers/net/dsa/mv88e6xxx/ptp.c
index 4b336d8d4c67..42872d21857b 100644
--- a/drivers/net/dsa/mv88e6xxx/ptp.c
+++ b/drivers/net/dsa/mv88e6xxx/ptp.c
@@ -400,7 +400,7 @@ int mv88e6xxx_ptp_setup(struct mv88e6xxx_chip *chip)
 
 	chip->ptp_clock_info.owner = THIS_MODULE;
 	snprintf(chip->ptp_clock_info.name, sizeof(chip->ptp_clock_info.name),
-		 dev_name(chip->dev));
+		 "%s", dev_name(chip->dev));
 	chip->ptp_clock_info.max_adj	= 1000000;
 
 	chip->ptp_clock_info.n_ext_ts	= ptp_ops->n_ext_ts;