[PATCH 2/2] mtd: nand_bbt: Skip bad blocks when searching for the BBT in NAND

[Stefan Riedmueller]

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.

Signed-off-by: Stefan Riedmueller <s.riedmueller at phytec.de>
---
 drivers/mtd/nand/nand_bbt.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index a86b5b2da38e..0b48373e6a0b 100644
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -528,6 +528,7 @@ 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;
@@ -563,6 +564,9 @@ 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