Index: uspace/lib/drv/generic/remote_usbhc.c
===================================================================
--- uspace/lib/drv/generic/remote_usbhc.c	(revision 3e6a98c595287c43d200d28d97f57755342be117)
+++ uspace/lib/drv/generic/remote_usbhc.c	(revision d9b2c73fe60c8358e376ab8fb1054d86149b1063)
@@ -463,6 +463,5 @@
 }
 
-static void callback_out(ddf_fun_t *fun,
-    int outcome, void *arg)
+static void callback_out(int outcome, void *arg)
 {
 	async_transaction_t *trans = arg;
@@ -473,6 +472,5 @@
 }
 
-static void callback_in(ddf_fun_t *fun,
-    int outcome, size_t actual_size, void *arg)
+static void callback_in(int outcome, size_t actual_size, void *arg)
 {
 	async_transaction_t *trans = (async_transaction_t *)arg;
Index: uspace/lib/drv/include/usbhc_iface.h
===================================================================
--- uspace/lib/drv/include/usbhc_iface.h	(revision 3e6a98c595287c43d200d28d97f57755342be117)
+++ uspace/lib/drv/include/usbhc_iface.h	(revision d9b2c73fe60c8358e376ab8fb1054d86149b1063)
@@ -58,9 +58,8 @@
 
 /** Callback for outgoing transfer. */
-typedef void (*usbhc_iface_transfer_out_callback_t)(ddf_fun_t *, int, void *);
+typedef void (*usbhc_iface_transfer_out_callback_t)(int, void *);
 
 /** Callback for incoming transfer. */
-typedef void (*usbhc_iface_transfer_in_callback_t)(ddf_fun_t *,
-    int, size_t, void *);
+typedef void (*usbhc_iface_transfer_in_callback_t)(int, size_t, void *);
 
 /** USB host controller communication interface. */