linux-kernel - Re: [PATCH v2 3/3] mtd: spinand: Don not erase the block before writing a bad block marker

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Date:   Mon, 17 Feb 2020 18:24:38 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Schrempf Frieder <frieder.schrempf@...tron.de>
Cc:     Boris Brezillon <bbrezillon@...nel.org>,
        Jeff Kletsky <git-commits@...ycomm.com>,
        liaoweixiong <liaoweixiong@...winnertech.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] mtd: spinand: Don not erase the block before
 writing a bad block marker

In the subject: s/Don not/Do not/

On Mon, 17 Feb 2020 15:54:12 +0000
Schrempf Frieder <frieder.schrempf@...tron.de> wrote:

> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> Currently when marking a block, we use spinand_erase_op() to erase
> the block before writing the marker to the OOB area. Doing so without
> waiting for the operation to finish can lead to the marking failing
> silently and no bad block marker being written to the flash.
> 
> In fact we don't need to do an erase at all before writing the BBM.
> The ECC is disabled for the raw access to the OOB data and we don't

			  s/the raw access/raw accesses/

> need to work around any issues with chips reporting ECC errors as it
> is known to be the case for raw NAND.
> 
> Fixes: 7529df465248 ("mtd: nand: Add core infrastructure to support SPI NANDs")
> Cc: stable@...r.kernel.org
> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> ---
> Changes in v2:
>  * Instead of waiting for the erase operation to finish, just don't
>    do an erase at all, as it is not needed.
>  * Update the commit message
> ---
>  drivers/mtd/nand/spi/core.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
> index a94287884453..8dda51bbdd11 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -613,7 +613,6 @@ static int spinand_markbad(struct nand_device *nand, const struct nand_pos *pos)
>  	};
>  	int ret;
>  
> -	/* Erase block before marking it bad. */
>  	ret = spinand_select_target(spinand, pos->target);
>  	if (ret)
>  		return ret;
> @@ -622,8 +621,6 @@ static int spinand_markbad(struct nand_device *nand, const struct nand_pos *pos)
>  	if (ret)
>  		return ret;
>  
> -	spinand_erase_op(spinand, pos);
> -
>  	return spinand_write_page(spinand, &req);
>  }
>