ramips: fix regression from r39949 (#15382)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 40391

target/linux/ramips/patches-3.10/0213-MTD-add-mt7621-nand-support.patch

@@ -4089,32 +4089,10 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
  	struct nand_chip *chip = mtd->priv;
 --- a/drivers/mtd/nand/nand_bbt.c
 +++ b/drivers/mtd/nand/nand_bbt.c
-@@ -1378,6 +1378,47 @@ int nand_isbad_bbt(struct mtd_info *mtd,
+@@ -1378,6 +1378,25 @@ int nand_isbad_bbt(struct mtd_info *mtd,
  	return 1;
  }
  
-+/**
-+ * nand_markbad_bbt - [NAND Interface] Mark a block bad in the BBT
-+ * @mtd: MTD device structure
-+ * @offs: offset of the bad block
-+ */
-+int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs)
-+{
-+	struct nand_chip *this = mtd->priv;
-+	int block, ret = 0;
-+
-+	block = (int)(offs >> this->bbt_erase_shift);
-+
-+	/* Mark bad block in memory */
-+	bbt_mark_entry(this, block, BBT_BLOCK_WORN);
-+
-+	/* Update flash-based bad block table */
-+	if (this->bbt_options & NAND_BBT_USE_FLASH)
-+		ret = nand_update_bbt(mtd, offs);
-+
-+	return ret;
-+}
-+
 +void nand_bbt_set(struct mtd_info *mtd, int page, int flag)
 +{
 +	struct nand_chip *this = mtd->priv;