diff --git a/drivers/net/dsa/mv88e6xxx/global1_atu.c b/drivers/net/dsa/mv88e6xxx/global1_atu.c
index ea243840ee0f..aca35c9d9fbd 100644
--- a/drivers/net/dsa/mv88e6xxx/global1_atu.c
+++ b/drivers/net/dsa/mv88e6xxx/global1_atu.c
@@ -363,7 +363,8 @@ static irqreturn_t mv88e6xxx_g1_atu_prob_irq_thread_fn(int irq, void *dev_id)
 		dev_err_ratelimited(chip->dev,
 				    "ATU full violation for %pM portvec %x spid %d\n",
 				    entry.mac, entry.portvec, spid);
-		chip->ports[spid].atu_full_violation++;
+		if (spid < ARRAY_SIZE(chip->ports))
+			chip->ports[spid].atu_full_violation++;
 	}
 	mutex_unlock(&chip->reg_lock);