Index: uspace/drv/audio/hdaudio/hdaudio.c
===================================================================
--- uspace/drv/audio/hdaudio/hdaudio.c	(revision 4a5ae542f43adbdc517ee90ece18b4376dc08468)
+++ uspace/drv/audio/hdaudio/hdaudio.c	(revision 992ffa61925d507ddd9ca906e90fb41d1ddbaacb)
@@ -175,6 +175,5 @@
 
 	ddf_msg(LVL_NOTE, "create parent sess");
-	hda->parent_sess = ddf_dev_parent_sess_create(dev,
-	    EXCHANGE_SERIALIZE);
+	hda->parent_sess = ddf_dev_parent_sess_create(dev);
 	if (hda->parent_sess == NULL) {
 		ddf_msg(LVL_ERROR, "Failed connecting parent driver.\n");
Index: uspace/drv/audio/sb16/dsp.c
===================================================================
--- uspace/drv/audio/sb16/dsp.c	(revision 4a5ae542f43adbdc517ee90ece18b4376dc08468)
+++ uspace/drv/audio/sb16/dsp.c	(revision 992ffa61925d507ddd9ca906e90fb41d1ddbaacb)
@@ -159,5 +159,5 @@
 static inline int setup_dma(sb_dsp_t *dsp, uintptr_t pa, size_t size)
 {
-	async_sess_t *sess = devman_parent_device_connect(EXCHANGE_ATOMIC,
+	async_sess_t *sess = devman_parent_device_connect(
 	    ddf_dev_get_handle(dsp->sb_dev), IPC_FLAG_BLOCKING);
 
@@ -307,5 +307,5 @@
 
 	assert(dsp->buffer.data);
-	async_sess_t *sess = devman_parent_device_connect(EXCHANGE_ATOMIC,
+	async_sess_t *sess = devman_parent_device_connect(
 	    ddf_dev_get_handle(dsp->sb_dev), IPC_FLAG_BLOCKING);
 
Index: uspace/drv/audio/sb16/main.c
===================================================================
--- uspace/drv/audio/sb16/main.c	(revision 4a5ae542f43adbdc517ee90ece18b4376dc08468)
+++ uspace/drv/audio/sb16/main.c	(revision 992ffa61925d507ddd9ca906e90fb41d1ddbaacb)
@@ -178,5 +178,5 @@
 
 	async_sess_t *parent_sess = devman_parent_device_connect(
-	    EXCHANGE_SERIALIZE, ddf_dev_get_handle(device), IPC_FLAG_BLOCKING);
+	    ddf_dev_get_handle(device), IPC_FLAG_BLOCKING);
 	if (!parent_sess)
 		return ENOMEM;
@@ -245,5 +245,5 @@
 {
 	async_sess_t *parent_sess = devman_parent_device_connect(
-	    EXCHANGE_SERIALIZE, ddf_dev_get_handle(device), IPC_FLAG_BLOCKING);
+	    ddf_dev_get_handle(device), IPC_FLAG_BLOCKING);
 	if (!parent_sess)
 		return ENOMEM;