linux-kernel - Re: [PATCH 3/4] mtd: spi-nor: sysfs: hide the flash name if not set

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Date: Mon, 29 Jan 2024 14:24:19 +0100
From: Pratyush Yadav <pratyush@...nel.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>
Cc: pratyush@...nel.org,  michael@...le.cc,  miquel.raynal@...tlin.com,
  richard@....at,  jaimeliao@...c.com.tw,  linux-mtd@...ts.infradead.org,
  linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] mtd: spi-nor: sysfs: hide the flash name if not set

On Fri, Dec 15 2023, Tudor Ambarus wrote:

> From: JaimeLiao <jaimeliao@...c.com.tw>
>
> The flash name is not reliable as we saw flash ID collisions.
> Hide the flash name if not set.
>
> Signed-off-by: JaimeLiao <jaimeliao@...c.com.tw>
> [ta: update commit subject and description]
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
> ---
>  Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor | 3 +++
>  drivers/mtd/spi-nor/sysfs.c                             | 2 ++
>  2 files changed, 5 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor b/Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor
> index c800621eff95..6d7be97bf7d1 100644
> --- a/Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor
> +++ b/Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor
> @@ -25,6 +25,9 @@ KernelVersion:	5.14
>  Contact:	linux-mtd@...ts.infradead.org
>  Description:	(RO) Part name of the SPI NOR flash.
>  
> +		The attribute is not present if the jedec_id founded in
> +		ID table but flash name didn't include in it.

Nitpick: strange sentence construction makes it a bit confusing.
Perhaps:

    The attribute is not present if the JEDEC ID table for the flash
    does not include its name.

> +
>  
>  What:		/sys/bus/spi/devices/.../spi-nor/sfdp
>  Date:		April 2021
> diff --git a/drivers/mtd/spi-nor/sysfs.c b/drivers/mtd/spi-nor/sysfs.c
> index 2dfdc555a69f..96064e4babf0 100644
> --- a/drivers/mtd/spi-nor/sysfs.c
> +++ b/drivers/mtd/spi-nor/sysfs.c
> @@ -78,6 +78,8 @@ static umode_t spi_nor_sysfs_is_visible(struct kobject *kobj,
>  
>  	if (attr == &dev_attr_manufacturer.attr && !nor->manufacturer)
>  		return 0;
> +	if (attr == &dev_attr_partname.attr && !nor->info->name)
> +		return 0;

Do you want to show the name for the "spi-nor-generic" flash? If not
then perhaps drop its name as well?

>  	if (attr == &dev_attr_jedec_id.attr && !nor->info->id && !nor->id)
>  		return 0;

-- 
Regards,
Pratyush Yadav