linux-kernel - Re: [PATCH 2/3] mtd: spi_nor: Introduce spi_nor_set_addr

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190801084746.638eae0b@collabora.com>
Date:   Thu, 1 Aug 2019 08:47:46 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     <Tudor.Ambarus@...rochip.com>
Cc:     <marek.vasut@...il.com>, <vigneshr@...com>, <dwmw2@...radead.org>,
        <computersforpeace@...il.com>, <miquel.raynal@...tlin.com>,
        <richard@....at>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] mtd: spi_nor: Introduce spi_nor_set_addr_width()

On Wed, 31 Jul 2019 09:18:47 +0000
<Tudor.Ambarus@...rochip.com> wrote:

> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
> 
> Parsing of flash parameters were interleaved with setting of the
> nor addr width. Dedicate a function for setting nor addr width.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>

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

> ---
>  drivers/mtd/spi-nor/spi-nor.c | 50 ++++++++++++++++++++++++++-----------------
>  1 file changed, 30 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index fba941a932cc..c322d7cd8216 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -4773,6 +4773,33 @@ static const struct flash_info *spi_nor_match_id(const char *name)
>  	return NULL;
>  }
>  
> +static int spi_nor_set_addr_width(struct spi_nor *nor)
> +{
> +	if (nor->addr_width) {
> +		/* already configured from SFDP */
> +	} else if (nor->info->addr_width) {
> +		nor->addr_width = nor->info->addr_width;
> +	} else if (nor->mtd.size > 0x1000000) {
> +		/* enable 4-byte addressing if the device exceeds 16MiB */
> +		nor->addr_width = 4;
> +	} else {
> +		nor->addr_width = 3;
> +	}
> +
> +	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
> +		dev_err(nor->dev, "address width is too large: %u\n",
> +			nor->addr_width);
> +		return -EINVAL;
> +	}
> +
> +	/* Set 4byte opcodes when possible. */
> +	if (nor->addr_width == 4 && nor->flags & SNOR_F_4B_OPCODES &&
> +	    !(nor->flags & SNOR_F_HAS_4BAIT))
> +		spi_nor_set_4byte_opcodes(nor);
> +
> +	return 0;
> +}
> +
>  int spi_nor_scan(struct spi_nor *nor, const char *name,
>  		 const struct spi_nor_hwcaps *hwcaps)
>  {
> @@ -4903,29 +4930,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
>  	if (ret)
>  		return ret;
>  
> -	if (nor->addr_width) {
> -		/* already configured from SFDP */
> -	} else if (info->addr_width) {
> -		nor->addr_width = info->addr_width;
> -	} else if (mtd->size > 0x1000000) {
> -		/* enable 4-byte addressing if the device exceeds 16MiB */
> -		nor->addr_width = 4;
> -	} else {
> -		nor->addr_width = 3;
> -	}
> -
>  	if (info->flags & SPI_NOR_4B_OPCODES)
>  		nor->flags |= SNOR_F_4B_OPCODES;
>  
> -	if (nor->addr_width == 4 && nor->flags & SNOR_F_4B_OPCODES &&
> -	    !(nor->flags & SNOR_F_HAS_4BAIT))
> -		spi_nor_set_4byte_opcodes(nor);
> -
> -	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
> -		dev_err(dev, "address width is too large: %u\n",
> -			nor->addr_width);
> -		return -EINVAL;
> -	}
> +	ret = spi_nor_set_addr_width(nor);
> +	if (ret)
> +		return ret;
>  
>  	/* Send all the required SPI flash commands to initialize device */
>  	ret = spi_nor_init(nor);