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mtd: rawnand: bbt: Skip bad blocks when searching for the BBT in NAND

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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: Stefan Riedmueller <s.riedmueller@phytec.de>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210325102337.481172-1-s.riedmueller@phytec.de
This commit is contained in:
Stefan Riedmueller 2021-03-25 11:23:37 +01:00 committed by Miquel Raynal
parent 25fefc88c7
commit bd9c9fe2ad
1 changed files with 5 additions and 0 deletions
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5
drivers/mtd/nand/raw/nand_bbt.c
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@ -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)) {