From 903cd06cd6ece7f9050a3ad5b03e0b76be2882ff Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Tue, 28 Jun 2011 16:28:58 -0700 Subject: [PATCH] mtd: nand: ignore ECC errors for simple BBM scans Now that nand_do_readoob() may return -EUCLEAN or -EBADMSG on ECC errors, we need to handle the return value specially in some cases. When scanning for simple bad block markers, reacting to an ECC error is not very useful, as we assume that the relevant markers are still non-0xFF for true bad blocks. Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy --- drivers/mtd/nand/nand_bbt.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c index f30807c..a4fcbf1 100644 --- a/drivers/mtd/nand/nand_bbt.c +++ b/drivers/mtd/nand/nand_bbt.c @@ -312,14 +312,20 @@ static int scan_read_raw_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, ops.oobbuf = buf + len; ops.datbuf = buf; ops.len = len; - return mtd->read_oob(mtd, offs, &ops); + res = mtd->read_oob(mtd, offs, &ops); + + /* Ignore ECC errors when checking for BBM */ + if (res != -EUCLEAN && res != -EBADMSG) + return res; + return 0; } else { ops.oobbuf = buf + mtd->writesize; ops.datbuf = buf; ops.len = mtd->writesize; res = mtd->read_oob(mtd, offs, &ops); - if (res) + /* Ignore ECC errors when checking for BBM */ + if (res && res != -EUCLEAN && res != -EBADMSG) return res; } @@ -435,7 +441,8 @@ static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, * byte reads for 16 bit buswidth. */ ret = mtd->read_oob(mtd, offs, &ops); - if (ret) + /* Ignore ECC errors when checking for BBM */ + if (ret && ret != -EUCLEAN && ret != -EBADMSG) return ret; if (check_short_pattern(buf, bd)) -- 2.7.4