Index: uspace/lib/drv/generic/remote_usbhc.c
===================================================================
--- uspace/lib/drv/generic/remote_usbhc.c	(revision 98b1d301e61446aa87b9e47da002832a97df3f07)
+++ uspace/lib/drv/generic/remote_usbhc.c	(revision 5c69377fed97da1526d8fb7b301c4eaa6f5bf92a)
@@ -59,5 +59,5 @@
  * @return Error code.
  */
-int usbhc_reserve_default_address(async_exch_t *exch)
+errno_t usbhc_reserve_default_address(async_exch_t *exch)
 {
 	if (!exch)
@@ -72,5 +72,5 @@
  * @return Error code.
  */
-int usbhc_release_default_address(async_exch_t *exch)
+errno_t usbhc_release_default_address(async_exch_t *exch)
 {
 	if (!exch)
@@ -88,9 +88,9 @@
  * @return Error code.
  */
-int usbhc_device_enumerate(async_exch_t *exch, unsigned port, usb_speed_t speed)
-{
-	if (!exch)
-		return EBADMEM;
-	const int ret = async_req_3_0(exch, DEV_IFACE_ID(USBHC_DEV_IFACE),
+errno_t usbhc_device_enumerate(async_exch_t *exch, unsigned port, usb_speed_t speed)
+{
+	if (!exch)
+		return EBADMEM;
+	const errno_t ret = async_req_3_0(exch, DEV_IFACE_ID(USBHC_DEV_IFACE),
 	    IPC_M_USB_DEVICE_ENUMERATE, port, speed);
 	return ret;
@@ -129,5 +129,5 @@
 	}
 
-	int ret = async_data_write_start(exch, desc, sizeof(*desc));
+	errno_t ret = async_data_write_start(exch, desc, sizeof(*desc));
 	if (ret != EOK) {
 		async_forget(opening_request);
@@ -136,9 +136,9 @@
 
 	/* Wait for the answer. */
-	int opening_request_rc;
+	errno_t opening_request_rc;
 	async_wait_for(opening_request, &opening_request_rc);
 
 	if (opening_request_rc)
-		return (int) opening_request_rc;
+		return (errno_t) opening_request_rc;
 
 	usb_pipe_desc_t dest;
@@ -166,5 +166,5 @@
 	}
 
-	const int ret = async_data_write_start(exch, pipe_desc, sizeof(*pipe_desc));
+	const errno_t ret = async_data_write_start(exch, pipe_desc, sizeof(*pipe_desc));
 	if (ret != EOK) {
 		async_forget(opening_request);
@@ -173,8 +173,8 @@
 
 	/* Wait for the answer. */
-	int opening_request_rc;
+	errno_t opening_request_rc;
 	async_wait_for(opening_request, &opening_request_rc);
 
-	return (int) opening_request_rc;
+	return (errno_t) opening_request_rc;
 }
 
@@ -313,5 +313,5 @@
 
 	const bool reserve = IPC_GET_ARG2(*call);
-	const int ret = usbhc_iface->default_address_reservation(fun, reserve);
+	const errno_t ret = usbhc_iface->default_address_reservation(fun, reserve);
 	async_answer_0(callid, ret);
 }
@@ -330,5 +330,5 @@
 	const unsigned port = DEV_IPC_GET_ARG1(*call);
 	usb_speed_t speed = DEV_IPC_GET_ARG2(*call);
-	const int ret = usbhc_iface->device_enumerate(fun, port, speed);
+	const errno_t ret = usbhc_iface->device_enumerate(fun, port, speed);
 	async_answer_0(callid, ret);
 }
@@ -345,5 +345,5 @@
 
 	const unsigned port = DEV_IPC_GET_ARG1(*call);
-	const int ret = usbhc_iface->device_remove(fun, port);
+	const errno_t ret = usbhc_iface->device_remove(fun, port);
 	async_answer_0(callid, ret);
 }
@@ -376,5 +376,5 @@
 	usb_pipe_desc_t pipe_desc;
 
-	const int rc = usbhc_iface->register_endpoint(fun, &pipe_desc, &ep_desc);
+	const errno_t rc = usbhc_iface->register_endpoint(fun, &pipe_desc, &ep_desc);
 	async_answer_0(callid, rc);
 
@@ -411,5 +411,5 @@
 	async_data_write_finalize(data_callid, &pipe_desc, sizeof(pipe_desc));
 
-	const int rc = usbhc_iface->unregister_endpoint(fun, &pipe_desc);
+	const errno_t rc = usbhc_iface->unregister_endpoint(fun, &pipe_desc);
 	async_answer_0(callid, rc);
 }
@@ -440,5 +440,5 @@
 }
 
-static errno_t transfer_finished(void *arg, int error, size_t transferred_size)
+static errno_t transfer_finished(void *arg, errno_t error, size_t transferred_size)
 {
 	async_transaction_t *trans = arg;
Index: uspace/lib/drv/include/usbhc_iface.h
===================================================================
--- uspace/lib/drv/include/usbhc_iface.h	(revision 98b1d301e61446aa87b9e47da002832a97df3f07)
+++ uspace/lib/drv/include/usbhc_iface.h	(revision 5c69377fed97da1526d8fb7b301c4eaa6f5bf92a)
@@ -160,11 +160,11 @@
 /** USB device communication interface. */
 typedef struct {
-	int (*default_address_reservation)(ddf_fun_t *, bool);
+	errno_t (*default_address_reservation)(ddf_fun_t *, bool);
 
-	int (*device_enumerate)(ddf_fun_t *, unsigned, usb_speed_t);
-	int (*device_remove)(ddf_fun_t *, unsigned);
+	errno_t (*device_enumerate)(ddf_fun_t *, unsigned, usb_speed_t);
+	errno_t (*device_remove)(ddf_fun_t *, unsigned);
 
-	int (*register_endpoint)(ddf_fun_t *, usb_pipe_desc_t *, const usb_endpoint_descriptors_t *);
-	int (*unregister_endpoint)(ddf_fun_t *, const usb_pipe_desc_t *);
+	errno_t (*register_endpoint)(ddf_fun_t *, usb_pipe_desc_t *, const usb_endpoint_descriptors_t *);
+	errno_t (*unregister_endpoint)(ddf_fun_t *, const usb_pipe_desc_t *);
 
 	errno_t (*transfer)(ddf_fun_t *, usb_target_t,