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mtd: ecc_strength is at ecc step granularity 

ecc_strength element of mtd_info will be the strength of one ecc step, not of
the entire writesize, as was previously planned.  This is the appropriate way
because, as was pointed out¹, bit errors in excess of the strength of one
step can cause a hard error if they all occur within the same ecc region.

¹ http://lists.infradead.org/pipermail/linux-mtd/2012-March/040313.html

Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Mike Dunn 2012-04-25 12:06:05 -07:00 committed by David Woodhouse
parent 09cbe581e3
commit 86c2072be6
2 changed files with 2 additions and 2 deletions
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2
drivers/mtd/nand/nand_base.c
View File

@ -3487,7 +3487,7 @@ int nand_scan_tail(struct mtd_info *mtd)
/* propagate ecc info to mtd_info */
mtd->ecclayout = chip->ecc.layout;
mtd->ecc_strength = chip->ecc.strength * chip->ecc.steps;
mtd->ecc_strength = chip->ecc.strength;
/* Check, if we should skip the bad block table scan */
if (chip->options & NAND_SKIP_BBTSCAN)

2
include/linux/mtd/mtd.h
View File

@ -164,7 +164,7 @@ struct mtd_info {
/* ECC layout structure pointer - read only! */
struct nand_ecclayout *ecclayout;
/* max number of correctible bit errors per writesize */
/* max number of correctible bit errors per ecc step */
unsigned int ecc_strength;
/* Data for variable erase regions. If numeraseregions is zero,