ata_id_xfermask
unsigned int xfer_mask = ata_id_xfermask(dev->id);
EXPORT_SYMBOL_GPL(ata_id_xfermask);
xfer_mask = ata_id_xfermask(id);
if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
xfer_mask &= ata_id_xfermask(dev->id);
extern unsigned int ata_id_xfermask(const u16 *id);