ahd_get_transfer_length
ahd_get_transfer_length(scb), scb->sg_count);
if (ahd_get_transfer_length(scb) & 0x01)
if (ahd_get_residual(scb) == ahd_get_transfer_length(scb)) {
resid = ahd_get_transfer_length(scb);
ahd_get_transfer_length(scb) - ahd_get_residual(scb);
ahd_get_transfer_length(scb));