linux-kernel - Re: [PATCH v3 2/3] mtd: spi-nor: otp: use more consistent wording

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20210520173906.3h3m6lykfpnmznkx@ti.com>
Date:   Thu, 20 May 2021 23:09:08 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Michael Walle <michael@...le.cc>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Subject: Re: [PATCH v3 2/3] mtd: spi-nor: otp: use more consistent wording

On 20/05/21 05:58PM, Michael Walle wrote:
> Use the wording as used in the datasheet to describe the access methods
> of the security registers (aka OTP storage). This will also match the
> function names.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
>  drivers/mtd/spi-nor/otp.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/otp.c b/drivers/mtd/spi-nor/otp.c
> index 91a4c510ed51..ec0c1b33f7cc 100644
> --- a/drivers/mtd/spi-nor/otp.c
> +++ b/drivers/mtd/spi-nor/otp.c
> @@ -15,14 +15,16 @@
>  #define spi_nor_otp_n_regions(nor) ((nor)->params->otp.org->n_regions)
>  
>  /**
> - * spi_nor_otp_read_secr() - read OTP data
> + * spi_nor_otp_read_secr() - read security register
>   * @nor:	pointer to 'struct spi_nor'
>   * @addr:       offset to read from
>   * @len:        number of bytes to read
>   * @buf:        pointer to dst buffer
>   *
> - * Read OTP data from one region by using the SPINOR_OP_RSECR commands. This
> - * method is used on GigaDevice and Winbond flashes.
> + * Read a security register by using the SPINOR_OP_RSECR commands. This method
> + * is used on GigaDevice and Winbond flashes to access OTP data.
> + *
> + * Please note, the read must not span multiple registers.

Security register is a very vague term. It in no way tells you that it 
means OTP data unless you already know. If I read this for the first 
time, I would think it is some sort of password or access enable/disable 
type of register, and not OTP data region.

Please add a note to clarify this. Same for the write and erase 
functions.

With this fixed,

Reviewed-by: Pratyush Yadav <p.yadav@...com>

>   *
>   * Return: number of bytes read successfully, -errno otherwise
>   */
> @@ -56,16 +58,16 @@ int spi_nor_otp_read_secr(struct spi_nor *nor, loff_t addr, size_t len, u8 *buf)
>  }
>  
>  /**
> - * spi_nor_otp_write_secr() - write OTP data
> + * spi_nor_otp_write_secr() - write security register
>   * @nor:        pointer to 'struct spi_nor'
>   * @addr:       offset to write to
>   * @len:        number of bytes to write
>   * @buf:        pointer to src buffer
>   *
> - * Write OTP data to one region by using the SPINOR_OP_PSECR commands. This
> - * method is used on GigaDevice and Winbond flashes.
> + * Write a security register by using the SPINOR_OP_PSECR commands. This method
> + * is used on GigaDevice and Winbond flashes to access OTP data.
>   *
> - * Please note, the write must not span multiple OTP regions.
> + * Please note, the write must not span multiple registers.
>   *
>   * Return: number of bytes written successfully, -errno otherwise
>   */
> @@ -88,7 +90,7 @@ int spi_nor_otp_write_secr(struct spi_nor *nor, loff_t addr, size_t len,
>  
>  	/*
>  	 * We only support a write to one single page. For now all winbond
> -	 * flashes only have one page per OTP region.
> +	 * flashes only have one page per security register.
>  	 */
>  	ret = spi_nor_write_enable(nor);
>  	if (ret)
> -- 
> 2.20.1
> 

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.