av1394_it_wait_frames
ret = av1394_it_wait_frames(icp, &xmit->tx_xfer.xf_empty_idx,
ret = av1394_it_wait_frames(icp, &itp->it_write_idx,
static int av1394_it_wait_frames(av1394_ic_t *, int *, int *, int *);