diff --git a/drivers/xen/xen-pciback/vpci.c b/drivers/xen/xen-pciback/vpci.c
index 01222d7dd20d2ec3ef70b7bb4ab5c2bf6646ce8b..46d140baebd8770463b9d37399f5149220920532 100644
--- a/drivers/xen/xen-pciback/vpci.c
+++ b/drivers/xen/xen-pciback/vpci.c
@@ -238,7 +238,7 @@ static int __xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
 			}
 		}
 	}
-	mutex_lock(&vpci_dev->lock);
+	mutex_unlock(&vpci_dev->lock);
 	return found;
 }