Commit bd9c9fe2 authored by Stefan Riedmueller's avatar Stefan Riedmueller Committed by Miquel Raynal
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mtd: rawnand: bbt: Skip bad blocks when searching for the BBT in NAND 



The blocks containing the bad block table can become bad as well. So
make sure to skip any blocks that are marked bad when searching for the
bad block table.

Otherwise in very rare cases where two BBT blocks wear out it might
happen that an obsolete BBT is used instead of a newer available
version.

Signed-off-by: default avatarStefan Riedmueller <s.riedmueller@phytec.de>
Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210325102337.481172-1-s.riedmueller@phytec.de
parent 25fefc88

drivers/mtd/nand/raw/nand_bbt.c

+5 −0
Original line number Diff line number Diff line
@@ -525,6 +525,7 @@ static int search_bbt(struct nand_chip *this, uint8_t *buf, 
{

	u64 targetsize = nanddev_target_size(&this->base);

	struct mtd_info *mtd = nand_to_mtd(this);

	struct nand_bbt_descr *bd = this->badblock_pattern;

	int i, chips;

	int startblock, block, dir;

	int scanlen = mtd->writesize + mtd->oobsize;
@@ -560,6 +561,10 @@ static int search_bbt(struct nand_chip *this, uint8_t *buf, 
			int actblock = startblock + dir * block;

			loff_t offs = (loff_t)actblock << this->bbt_erase_shift;



			/* Check if block is marked bad */

			if (scan_block_fast(this, bd, offs, buf))

				continue;



			/* Read first page */

			scan_read(this, buf, offs, mtd->writesize, td);

			if (!check_pattern(buf, scanlen, mtd->writesize, td)) {