From: Stefan Riedmueller Date: Thu, 25 Mar 2021 10:23:37 +0000 (+0100) Subject: mtd: rawnand: bbt: Skip bad blocks when searching for the BBT in NAND X-Git-Tag: accepted/tizen/unified/20230118.172025~7394^2~2^2~6 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bd9c9fe2ad04546940f4a9979d679e62cae6aa51;p=platform%2Fkernel%2Flinux-rpi.git 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: Stefan Riedmueller Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210325102337.481172-1-s.riedmueller@phytec.de --- diff --git a/drivers/mtd/nand/raw/nand_bbt.c b/drivers/mtd/nand/raw/nand_bbt.c index dced32a..6e25a5c 100644 --- a/drivers/mtd/nand/raw/nand_bbt.c +++ b/drivers/mtd/nand/raw/nand_bbt.c @@ -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)) {