diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 3566c00e1e3d5d385a937d4036ad2ae91e9a1791..dc8177950d0523b288f69b98dd682b67f7636a13 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -752,7 +752,7 @@ int xen_irq_from_pirq(unsigned pirq)
 	}
 	irq = -1;
 out:
-	spin_lock(&irq_mapping_update_lock);
+	spin_unlock(&irq_mapping_update_lock);
 
 	return irq;
 }