Re: [PATCH 4/5] mtd: rawnand: mtk: Fix wrongly assigned oob buffer pointer issue

[Miquel Raynal <miquel.raynal-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>]

Hi Xiaolei,

Xiaolei Li <xiaolei.li@mediatek.com> wrote on Mon, 29 Apr 2019 14:38:33
+0800:

> One main goal of the function mtk_nfc_update_ecc_stats is to check
> whether sectors are all empty. If they are empty, set these sectors's
> data buffer and oob buffer as 0xff.
> 
> But now, the sector oob buffer pointer is wrongly assigned. We always
> do memset from sector 0.
> 
> To fix this issue, pass start secotr number to make oob buffer pointer

                                sector

> be properly assigned.

Please use upper case for plain English acronyms: NAND, ECC, OOB, etc.

> 
> Fixes: 93db446a424c ("mtd: nand: move raw NAND related code to the raw/ subdir")

Same comment as before, wrong commit pointed in the Fixes tag.

> Signed-off-by: Xiaolei Li <xiaolei.li@mediatek.com>
> ---
>  drivers/mtd/nand/raw/mtk_nand.c | 21 ++++++++++-----------
>  1 file changed, 10 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/mtk_nand.c b/drivers/mtd/nand/raw/mtk_nand.c
> index 7a5e8c9cf61b..cf5e50e704ae 100644
> --- a/drivers/mtd/nand/raw/mtk_nand.c
> +++ b/drivers/mtd/nand/raw/mtk_nand.c
> @@ -873,19 +873,21 @@ static int mtk_nfc_write_oob_std(struct nand_chip *chip, int page)
>  	return mtk_nfc_write_page_raw(chip, NULL, 1, page);
>  }
>  
> -static int mtk_nfc_update_ecc_stats(struct mtd_info *mtd, u8 *buf, u32 sectors)
> +static int mtk_nfc_update_ecc_stats(struct mtd_info *mtd, u8 *buf, u32 start,
> +				    u32 sectors)
>  {
>  	struct nand_chip *chip = mtd_to_nand(mtd);
>  	struct mtk_nfc *nfc = nand_get_controller_data(chip);
>  	struct mtk_nfc_nand_chip *mtk_nand = to_mtk_nand(chip);
>  	struct mtk_ecc_stats stats;
> +	u32 reg_size = mtk_nand->fdm.reg_size;
>  	int rc, i;
>  
>  	rc = nfi_readl(nfc, NFI_STA) & STA_EMP_PAGE;
>  	if (rc) {
>  		memset(buf, 0xff, sectors * chip->ecc.size);
>  		for (i = 0; i < sectors; i++)
> -			memset(oob_ptr(chip, i), 0xff, mtk_nand->fdm.reg_size);
> +			memset(oob_ptr(chip, start + i), 0xff, reg_size);
>  		return 0;
>  	}
>  
> @@ -905,7 +907,7 @@ static int mtk_nfc_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
>  	u32 spare = mtk_nand->spare_per_sector;
>  	u32 column, sectors, start, end, reg;
>  	dma_addr_t addr;
> -	int bitflips;
> +	int bitflips = 0;
>  	size_t len;
>  	u8 *buf;
>  	int rc;
> @@ -972,14 +974,11 @@ static int mtk_nfc_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
>  	if (rc < 0) {
>  		dev_err(nfc->dev, "subpage done timeout\n");
>  		bitflips = -EIO;
> -	} else {
> -		bitflips = 0;
> -		if (!raw) {
> -			rc = mtk_ecc_wait_done(nfc->ecc, ECC_DECODE);
> -			bitflips = rc < 0 ? -ETIMEDOUT :
> -				mtk_nfc_update_ecc_stats(mtd, buf, sectors);
> -			mtk_nfc_read_fdm(chip, start, sectors);
> -		}
> +	} else if (!raw) {
> +		rc = mtk_ecc_wait_done(nfc->ecc, ECC_DECODE);
> +		bitflips = rc < 0 ? -ETIMEDOUT :
> +			mtk_nfc_update_ecc_stats(mtd, buf, start, sectors);
> +		mtk_nfc_read_fdm(chip, start, sectors);
>  	}
>  
>  	dma_unmap_single(nfc->dev, addr, len, DMA_FROM_DEVICE);

With this addressed:

Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>


Thanks,
Miquèl

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