linux-kernel - Re: [PATCH v2] mtd: spinand: read return badly if the last page has bitflips

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Date:   Mon, 24 Jun 2019 07:37:44 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     liaoweixiong <liaoweixiong@...winnertech.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        "David Woodhouse" <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Frieder Schrempf <frieder.schrempf@...eet.de>,
        Peter Pan <peterpandong@...ron.com>,
        "Jeff Kletsky" <git-commits@...ycomm.com>
CC:     "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mtd: spinand: read return badly if the last page has
 bitflips

On 20.06.19 03:00, liaoweixiong wrote:
> In case of the last page containing bitflips (ret > 0),
> spinand_mtd_read() will return that number of bitflips for the last
> page. But to me it looks like it should instead return max_bitflips like
> it does when the last page read returns with 0.
> 
> Signed-off-by: liaoweixiong <liaoweixiong@...winnertech.com>

Reviewed-by: Frieder Schrempf <frieder.schrempf@...tron.de>

This should probably be resent with the following tags:

Cc: stable@...r.kernel.org
Fixes: 7529df465248 ("mtd: nand: Add core infrastructure to support SPI 
NANDs")

> ---
>   drivers/mtd/nand/spi/core.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
> index 556bfdb..6b9388d 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -511,12 +511,12 @@ static int spinand_mtd_read(struct mtd_info *mtd, loff_t from,
>   		if (ret == -EBADMSG) {
>   			ecc_failed = true;
>   			mtd->ecc_stats.failed++;
> -			ret = 0;
>   		} else {
>   			mtd->ecc_stats.corrected += ret;
>   			max_bitflips = max_t(unsigned int, max_bitflips, ret);
>   		}
>   
> +		ret = 0;
>   		ops->retlen += iter.req.datalen;
>   		ops->oobretlen += iter.req.ooblen;
>   	}
>