linux-kernel - Re: [PATCH v4 03/11] mtd: spi-nor: core: Use auto-detection only once

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Message-ID: <7f570c32-d0be-97ba-0a1b-9aca93cfbbf1@microchip.com>
Date:   Thu, 21 Apr 2022 07:18:21 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <p.yadav@...com>, <michael@...le.cc>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <Takahiro.Kuwano@...ineon.com>
Subject: Re: [PATCH v4 03/11] mtd: spi-nor: core: Use auto-detection only once

Hi, Pratyush,

I forgot to remove few checks, would you please remove them when applying?
See below.

On 4/20/22 13:34, Tudor Ambarus wrote:
> In case spi_nor_match_name() returned NULL, the auto detection was
> issued twice. There's no reason to try to detect the same chip twice,
> do the auto detection only once.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> Reviewed-by: Michael Walle <michael@...le.cc>
> ---
>  drivers/mtd/spi-nor/core.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index b9cc8bbf1f62..b55d922d46dd 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -2896,13 +2896,14 @@ static const struct flash_info *spi_nor_get_flash_info(struct spi_nor *nor,
>  {
>  	const struct flash_info *info = NULL;
>  
> -	if (name)
> +	if (name) {
>  		info = spi_nor_match_name(nor, name);
> +		if (IS_ERR(info))
> +			return info;

As Michael suggested spi_nor_match_name() returns NULL or valid entry, so this
check is not necessary, let's remove them.

> +	}
>  	/* Try to auto-detect if chip name wasn't specified or not found */
>  	if (!info)
> -		info = spi_nor_read_id(nor);
> -	if (IS_ERR_OR_NULL(info))
> -		return ERR_PTR(-ENOENT);
> +		return spi_nor_read_id(nor);
>  
>  	/*
>  	 * If caller has specified name of flash model that can normally be
> @@ -2994,7 +2995,9 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
>  		return -ENOMEM;
>  
>  	info = spi_nor_get_flash_info(nor, name);
> -	if (IS_ERR(info))
> +	if (!info)
> +		return -ENOENT;

also according to Michael, this change is not needed as spi_nor_get_flash_info() can't
return NULL. Here we can keep the code as it was. Let me know if you want me to respin.

> +	else if (IS_ERR(info))
>  		return PTR_ERR(info);
>  
>  	nor->info = info;