diff --git a/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/common.c b/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/common.c
index 5c15824d00..d02f958501 100644
--- a/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/common.c
+++ b/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/common.c
@@ -1599,7 +1599,7 @@ static int __init rtl83xx_sw_probe(struct platform_device *pdev)
 		priv->cpu_port = RTL931X_CPU_PORT;
 		priv->port_mask = 0x3f;
 		priv->port_width = 2;
-		priv->irq_mask = 0xFFFFFFFFFFFFFULL;
+		priv->irq_mask = GENMASK_ULL(priv->cpu_port - 1, 0);
 		priv->r = &rtl931x_reg;
 		priv->ds->num_ports = 57;
 		priv->fib_entries = 16384;