Index: uspace/drv/bus/usb/usbmast/main.c
===================================================================
--- uspace/drv/bus/usb/usbmast/main.c	(revision d95f02ff97c7180363ae71275c28b8353ddcfc1f)
+++ uspace/drv/bus/usb/usbmast/main.c	(revision 4c50c8dd1555356fb68e1ee843c1fc8c60d5c2ec)
@@ -94,5 +94,5 @@
 
 	/* Allocate softstate */
-	mdev = calloc(1, sizeof(usbmast_dev_t));
+	mdev = ddf_dev_data_alloc(dev->ddf_dev, sizeof(usbmast_dev_t));
 	if (mdev == NULL) {
 		usb_log_error("Failed allocating softstate.\n");