Re: [PATCH v2] mtd: nand: imx-bbm: use raw reading when checking for factory BBM

[Sascha Hauer <s.hauer@pengutronix.de>]

On Fri, Jul 08, 2016 at 09:25:43AM +0200, Uwe Kleine-König wrote:
> This is necessary to prevent the imx_nand_bbm command to bail out
> on ECC errors which leaves the device without BBT.
> 
> Also simplify buffer management: Use on-stack buffer instead of malloc.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> ---
> Changes since (implicit) v1 sent with Message-Id: 1467884923-24060-1-git-send-email-u.kleine-koenig@pengutronix.de:
> 
>  - drop two now unused variables fixing two compiler warnings
> 
>  drivers/mtd/nand/nand_imx_bbm.c | 33 ++++++++++++++++-----------------
>  1 file changed, 16 insertions(+), 17 deletions(-)

Applied, thanks

Sascha

> 
> diff --git a/drivers/mtd/nand/nand_imx_bbm.c b/drivers/mtd/nand/nand_imx_bbm.c
> index 251dfe5d3f12..23722a906473 100644
> --- a/drivers/mtd/nand/nand_imx_bbm.c
> +++ b/drivers/mtd/nand/nand_imx_bbm.c
> @@ -52,12 +52,20 @@
>   * on the flash BBT.
>   *
>   */
> -static int checkbad(struct mtd_info *mtd, loff_t ofs, void *__buf)
> +static int checkbad(struct mtd_info *mtd, loff_t ofs)
>  {
> -	int ret, retlen;
> -	uint8_t *buf = __buf;
> -
> -	ret = mtd->read(mtd, ofs, mtd->writesize, &retlen, buf);
> +	int ret;
> +	uint8_t buf[mtd->writesize + mtd->oobsize];
> +	struct mtd_oob_ops ops;
> +
> +	ops.mode = MTD_OPS_RAW;
> +	ops.ooboffs = 0;
> +	ops.datbuf = buf;
> +	ops.len = mtd->writesize;
> +	ops.oobbuf = buf + mtd->writesize;
> +	ops.ooblen = mtd->oobsize;
> +
> +	ret = mtd_read_oob(mtd, ofs, &ops);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -72,7 +80,6 @@ static void *create_bbt(struct mtd_info *mtd)
>  	struct nand_chip *chip = mtd->priv;
>  	int len, i, numblocks, ret;
>  	loff_t from = 0;
> -	void *buf;
>  	uint8_t *bbt;
>  
>  	if ((chip->bbt_td && chip->bbt_td->pages[0] != -1) ||
> @@ -88,18 +95,12 @@ static void *create_bbt(struct mtd_info *mtd)
>  	if (!bbt)
>  		return ERR_PTR(-ENOMEM);
>  
> -	buf = malloc(mtd->writesize);
> -	if (!buf) {
> -		ret = -ENOMEM;
> -		goto out2;
> -	}
> -
>  	numblocks = mtd->size >> (chip->bbt_erase_shift - 1);
>  
>  	for (i = 0; i < numblocks;) {
> -		ret = checkbad(mtd, from, buf);
> +		ret = checkbad(mtd, from);
>  		if (ret < 0)
> -			goto out1;
> +			goto out;
>  
>  		if (ret) {
>  			bbt[i >> 3] |= 0x03 << (i & 0x6);
> @@ -113,9 +114,7 @@ static void *create_bbt(struct mtd_info *mtd)
>  
>  	return bbt;
>  
> -out1:
> -	free(buf);
> -out2:
> +out:
>  	free(bbt);
>  
>  	return ERR_PTR(ret);
> -- 
> 2.8.1
> 
> 
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