nanddev_isbad
EXPORT_SYMBOL_GPL(nanddev_isbad);
if (nanddev_isbad(nand, pos))
if (nanddev_isbad(nand, pos) || nanddev_isreserved(nand, pos)) {
ret = nanddev_isbad(nand, &pos);
bool nanddev_isbad(struct nand_device *nand, const struct nand_pos *pos);