[PATCH v4] mtdchar: fix usage of mtd_ooblayout_ecc()

[PATCH v4] mtdchar: fix usage of mtd_ooblayout_ecc()

[OuYang ZhiZhong]

Section was not properly computed. The value of OOB region definition is
always ECC section 0 information in the OOB area, but we want to get all
the ECC bytes information, so we should call
mtd_ooblayout_ecc(mtd, section++, &oobregion) until it returns -ERANGE.

Fixes: c2b78452a9db ("mtd: use mtd_ooblayout_xxx() helpers where appropriate")
Cc: <stable@vger.kernel.org>
Signed-off-by: OuYang ZhiZhong <ouyzz@yealink.com>
---
 drivers/mtd/mtdchar.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index de8c902..7d80a8b 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -479,7 +479,7 @@ static int shrink_ecclayout(struct mtd_info *mtd,
 	for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
 		u32 eccpos;
 
-		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
+		ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
 		if (ret < 0) {
 			if (ret != -ERANGE)
 				return ret;
@@ -526,7 +526,7 @@ static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
 	for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
 		u32 eccpos;
 
-		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
+		ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
 		if (ret < 0) {
 			if (ret != -ERANGE)
 				return ret;
-- 
1.7.9.5

Re: [PATCH v4] mtdchar: fix usage of mtd_ooblayout_ecc()

[Boris Brezillon]

On Sun, 11 Mar 2018 15:59:07 +0800
OuYang ZhiZhong <ouyzz@yealink.com> wrote:

> Section was not properly computed. The value of OOB region definition is
> always ECC section 0 information in the OOB area, but we want to get all
> the ECC bytes information, so we should call
> mtd_ooblayout_ecc(mtd, section++, &oobregion) until it returns -ERANGE.

Applied.

Thanks,

Boris

> 
> Fixes: c2b78452a9db ("mtd: use mtd_ooblayout_xxx() helpers where appropriate")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: OuYang ZhiZhong <ouyzz@yealink.com>
> ---
>  drivers/mtd/mtdchar.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
> index de8c902..7d80a8b 100644
> --- a/drivers/mtd/mtdchar.c
> +++ b/drivers/mtd/mtdchar.c
> @@ -479,7 +479,7 @@ static int shrink_ecclayout(struct mtd_info *mtd,
>  	for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
>  		u32 eccpos;
>  
> -		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
> +		ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
>  		if (ret < 0) {
>  			if (ret != -ERANGE)
>  				return ret;
> @@ -526,7 +526,7 @@ static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
>  	for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
>  		u32 eccpos;
>  
> -		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
> +		ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
>  		if (ret < 0) {
>  			if (ret != -ERANGE)
>  				return ret;



-- 
Boris Brezillon, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com