diff --git a/drivers/xen/xen-pciback/vpci.c b/drivers/xen/xen-pciback/vpci.c
index 01222d7..46d140b 100644
--- a/drivers/xen/xen-pciback/vpci.c
+++ b/drivers/xen/xen-pciback/vpci.c
@@ -238,7 +238,7 @@
 			}
 		}
 	}
-	mutex_lock(&vpci_dev->lock);
+	mutex_unlock(&vpci_dev->lock);
 	return found;
 }