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From: <Tudor.Ambarus@microchip.com>
To: <dan.carpenter@oracle.com>, <marek.vasut@gmail.com>,
	<Cyrille.Pitchen@microchip.com>
Cc: vigneshr@ti.com, richard@nod.at, kernel-janitors@vger.kernel.org,
	linux-mtd@lists.infradead.org, miquel.raynal@bootlin.com,
	computersforpeace@gmail.com, dwmw2@infradead.org
Subject: Re: [PATCH] mtd: spi-nor: Fix an error code in spi_nor_read_raw()
Date: Wed, 21 Aug 2019 07:35:21 +0000
Message-ID: <568a064f-af88-bfd6-b50c-208f9cc9f8b0@microchip.com> (raw)
In-Reply-To: <20190815083252.GD27238@mwanda>



On 08/15/2019 11:32 AM, Dan Carpenter wrote:
> External E-Mail
> 
> 
> 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@oracle.com>

Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>

> ---
>  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;
>  
>  		buf += ret;
>  		addr += ret;
> 
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Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-15  8:32 Dan Carpenter
2019-08-15 10:35 ` walter harms
2019-08-15 14:41   ` Dan Carpenter
2019-08-21  7:35 ` Tudor.Ambarus [this message]
2019-08-21  8:21 ` Tudor.Ambarus

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