diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
index 62a632d73991ad807e80d295aab2d17362dc9339..d16ed64feb3d9b4b470ebeaecf227fa8b49151b5 100644
--- a/drivers/irqchip/irq-loongson-eiointc.c
+++ b/drivers/irqchip/irq-loongson-eiointc.c
@@ -280,9 +280,6 @@ static void acpi_set_vec_parent(int node, struct irq_domain *parent, struct acpi
 {
 	int i;
 
-	if (cpu_has_flatmode)
-		node = cpu_to_node(node * CORES_PER_EIO_NODE);
-
 	for (i = 0; i < MAX_IO_PICS; i++) {
 		if (node == vec_group[i].node) {
 			vec_group[i].parent = parent;
@@ -349,8 +346,16 @@ static int __init pch_pic_parse_madt(union acpi_subtable_headers *header,
 static int __init pch_msi_parse_madt(union acpi_subtable_headers *header,
 					const unsigned long end)
 {
+	struct irq_domain *parent;
 	struct acpi_madt_msi_pic *pchmsi_entry = (struct acpi_madt_msi_pic *)header;
-	struct irq_domain *parent = acpi_get_vec_parent(eiointc_priv[nr_pics - 1]->node, msi_group);
+	int node;
+
+	if (cpu_has_flatmode)
+		node = cpu_to_node(eiointc_priv[nr_pics - 1]->node * CORES_PER_EIO_NODE);
+	else
+		node = eiointc_priv[nr_pics - 1]->node;
+
+	parent = acpi_get_vec_parent(node, msi_group);
 
 	if (parent)
 		return pch_msi_acpi_init(parent, pchmsi_entry);
@@ -379,6 +384,7 @@ int __init eiointc_acpi_init(struct irq_domain *parent,
 	int i, ret, parent_irq;
 	unsigned long node_map;
 	struct eiointc_priv *priv;
+	int node;
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
@@ -421,8 +427,12 @@ int __init eiointc_acpi_init(struct irq_domain *parent,
 				  "irqchip/loongarch/intc:starting",
 				  eiointc_router_init, NULL);
 
-	acpi_set_vec_parent(acpi_eiointc->node, priv->eiointc_domain, pch_group);
-	acpi_set_vec_parent(acpi_eiointc->node, priv->eiointc_domain, msi_group);
+	if (cpu_has_flatmode)
+		node = cpu_to_node(acpi_eiointc->node * CORES_PER_EIO_NODE);
+	else
+		node = acpi_eiointc->node;
+	acpi_set_vec_parent(node, priv->eiointc_domain, pch_group);
+	acpi_set_vec_parent(node, priv->eiointc_domain, msi_group);
 	ret = acpi_cascade_irqdomain_init();
 
 	return ret;