diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index 6fa1627ce08d..445b51db75b0 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -222,6 +222,7 @@ static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
 		}
 		/* If arch decided it can't, fall through... */
 #endif /* HAVE_PCI_MMAP */
+		/* fall through */
 	default:
 		ret = -EINVAL;
 		break;
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index eba6e33147a2..14cf0f41ecf0 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -1104,7 +1104,7 @@ static void __ref pcifront_backend_changed(struct xenbus_device *xdev,
 	case XenbusStateClosed:
 		if (xdev->state == XenbusStateClosed)
 			break;
-		/* Missed the backend's CLOSING state -- fallthrough */
+		/* fall through - Missed the backend's CLOSING state. */
 	case XenbusStateClosing:
 		dev_warn(&xdev->dev, "backend going away!\n");
 		pcifront_try_disconnect(pdev);