Re: [PATCH] mtd: spi-nor: Make sure nor->spimem and nor->controller_ops are mutually exclusive

[Boris Brezillon <boris.brezillon@collabora.com>]

On Mon, 11 Nov 2019 09:44:08 +0000
<Tudor.Ambarus@microchip.com> wrote:

> From: Tudor Ambarus <tudor.ambarus@microchip.com>
> 
> Expand the spi_nor_check() to make sure that nor->spimem and
> nor->controller_ops are mutually exclusive.
> 
> Fixes: b35b9a10362d ("mtd: spi-nor: Move m25p80 code in spi-nor.c")
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>

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

> ---
> v3:
> - split checks for better error accuracy
> - s/mutual/mutually
> 
>  drivers/mtd/spi-nor/spi-nor.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 824649eecd59..f5d24ccf5108 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -2878,6 +2878,7 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
>  static int spi_nor_check(struct spi_nor *nor)
>  {
>  	if (!nor->dev ||
> +	    (!nor->spimem && !nor->controller_ops) ||
>  	    (!nor->spimem && nor->controller_ops &&
>  	    (!nor->controller_ops->read ||
>  	     !nor->controller_ops->write ||
> @@ -2887,6 +2888,11 @@ static int spi_nor_check(struct spi_nor *nor)
>  		return -EINVAL;
>  	}
>  
> +	if (nor->spimem && nor->controller_ops) {
> +		dev_err(nor->dev, "nor->spimem and nor->controller_ops are mutually exclusive, please set just one of them.\n");
> +		return -EINVAL;
> +	}
> +
>  	return 0;
>  }
>  


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