buffer_exchange
return buffer_exchange(controller, (multi_buffer_info*)arg);
return buffer_exchange(cookie, (multi_buffer_info*)arg);
case B_MULTI_BUFFER_EXCHANGE: return buffer_exchange(cookie, arg);
case B_MULTI_BUFFER_EXCHANGE: return buffer_exchange(cookie, arg);
return buffer_exchange(fDevice, info);
status_t buffer_exchange(int device, multi_buffer_info* info);