ata_acpi_gtf
static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
const struct ata_acpi_gtf *gtf,
const struct ata_acpi_gtf *gtf,
const struct ata_acpi_gtf *prev_gtf)
struct ata_acpi_gtf *gtf = NULL, *pgtf = NULL;