Re: [PATCH] mtd: spi-nor: Fix an error code in spi_nor_read_raw()

[walter harms <wharms@xxxxxx>]

Am 15.08.2019 10:32, schrieb Dan Carpenter:
> The problem is that if "ret" is negative then when we check if
> "ret > len", that condition is going to be true because of type
> promotion.  So this patch re-orders the code to check for negatives
> first and preserve those error codes.
> 
> Fixes: f384b352cbf0 ("mtd: spi-nor: parse Serial Flash Discoverable Parameters (SFDP) tables")
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> ---
>  drivers/mtd/spi-nor/spi-nor.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 63af87609bac..986b0754495d 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -2903,10 +2903,10 @@ static int spi_nor_read_raw(struct spi_nor *nor, u32 addr, size_t len, u8 *buf)
>  
>  	while (len) {
>  		ret = spi_nor_read_data(nor, addr, len, buf);
> -		if (!ret || ret > len)
> -			return -EIO;
>  		if (ret < 0)
>  			return ret;
> +		if (!ret || ret > len)
> +			return -EIO;

Bonuspoints to make this more readable:

	if (ret==0 || ret > len)
		return -EIO;

that makes the intention more obvious.

JM2C,
 wh

>  
>  		buf += ret;
>  		addr += ret;

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