diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 06f2e61..accb37a 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -434,6 +434,10 @@
 
 static void xen_free_irq(unsigned irq)
 {
+	/* Legacy IRQ descriptors are managed by the arch. */
+	if (irq < NR_IRQS_LEGACY)
+		return;
+
 	irq_free_desc(irq);
 }