diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index 2f57956..2a3428b 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -645,8 +645,10 @@
 			found = 1;
 			break;
 		}
-	if (!found)
+	if (!found) {
+		spin_unlock_irqrestore(&vio_cmo.lock, flags);
 		return;
+	}
 
 	/* Increase/decrease in desired device entitlement */
 	if (desired >= viodev->cmo.desired) {