336 #define ENSURE(call, bits) if (cdo->call == NULL) *change_capability &= ~(bits)  macro
358 	ENSURE(drive_status, CDC_DRIVE_STATUS );  in register_cdrom()
359 	ENSURE(media_changed, CDC_MEDIA_CHANGED);  in register_cdrom()
360 	ENSURE(tray_move, CDC_CLOSE_TRAY | CDC_OPEN_TRAY);  in register_cdrom()
361 	ENSURE(lock_door, CDC_LOCK);  in register_cdrom()
362 	ENSURE(select_speed, CDC_SELECT_SPEED);  in register_cdrom()
363 	ENSURE(get_last_session, CDC_MULTI_SESSION);  in register_cdrom()
364 	ENSURE(get_mcn, CDC_MCN);  in register_cdrom()
365 	ENSURE(reset, CDC_RESET);  in register_cdrom()
366 	ENSURE(audio_ioctl, CDC_PLAY_AUDIO);  in register_cdrom()
367 	ENSURE(dev_ioctl, CDC_IOCTLS);  in register_cdrom()
368 	ENSURE(generic_packet, CDC_GENERIC_PACKET);  in register_cdrom()
407 #undef ENSURE