mtd_lock
mtd_lock(scb2_mtd, 0, scb2_mtd->size);
ret = mtd_lock(mtd, einfo.start, einfo.length);
err = mtd_lock(subdev, ofs, size);
EXPORT_SYMBOL_GPL(mtd_lock);
int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);