linux-kernel - [PATCH] mtd: rawnand: nand_bbt: Skip bad blocks when searching for the BBT in NAND

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Date:   Thu, 25 Mar 2021 11:23:37 +0100
From:   Stefan Riedmueller <s.riedmueller@...tec.de>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-mtd@...ts.infradead.org, Richard Weinberger <richard@....at>,
        linux-kernel@...r.kernel.org,
        Stefan Riedmueller <s.riedmueller@...tec.de>
Subject: [PATCH] mtd: rawnand: nand_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 <s.riedmueller@...tec.de>
---
 drivers/mtd/nand/raw/nand_bbt.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mtd/nand/raw/nand_bbt.c b/drivers/mtd/nand/raw/nand_bbt.c
index dced32a126d9..6e25a5ce5ba9 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)) {
-- 
2.25.1