diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 0b70811..621d8dd 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -1543,7 +1543,8 @@
 	if (data->chip->irq_request_resources)
 		return data->chip->irq_request_resources(data);
 
-	return -ENOSYS;
+	/* no error on missing optional irq_chip::irq_request_resources */
+	return 0;
 }
 EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);