Index: uspace/drv/ns8250/ns8250.c
===================================================================
--- uspace/drv/ns8250/ns8250.c	(revision ebcb05a569ef3a706553a41bd6a44277cc63277f)
+++ uspace/drv/ns8250/ns8250.c	(revision d9006997e0426015afb8c80b3b2fb49e4f256ee6)
@@ -263,7 +263,7 @@
 static void ns8250_dev_cleanup(ns8250_t *ns)
 {
-	if (ns->dev->parent_phone > 0) {
-		async_hangup(ns->dev->parent_phone);
-		ns->dev->parent_phone = 0;
+	if (ns->dev->parent_sess) {
+		async_hangup(ns->dev->parent_sess);
+		ns->dev->parent_sess = NULL;
 	}
 }
@@ -337,15 +337,15 @@
 	
 	/* Connect to the parent's driver. */
-	ns->dev->parent_phone = devman_parent_device_connect(ns->dev->handle,
-	    IPC_FLAG_BLOCKING);
-	if (ns->dev->parent_phone < 0) {
+	ns->dev->parent_sess = devman_parent_device_connect(EXCHANGE_SERIALIZE,
+	    ns->dev->handle, IPC_FLAG_BLOCKING);
+	if (!ns->dev->parent_sess) {
 		ddf_msg(LVL_ERROR, "Failed to connect to parent driver of "
 		    "device %s.", ns->dev->name);
-		ret = ns->dev->parent_phone;
+		ret = ENOENT;
 		goto failed;
 	}
 	
 	/* Get hw resources. */
-	ret = hw_res_get_resource_list(ns->dev->parent_phone, &hw_resources);
+	ret = hw_res_get_resource_list(ns->dev->parent_sess, &hw_resources);
 	if (ret != EOK) {
 		ddf_msg(LVL_ERROR, "Failed to get HW resources for device "