linux-kernel - Re: [PATCH v3 3/9] mtd: spi-nor: core: Use auto-detection only once

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Message-ID: <8a12e7d841827388d1f8839d8afdfe5c@walle.cc>
Date:   Tue, 19 Apr 2022 12:18:42 +0200
From:   Michael Walle <michael@...le.cc>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>
Cc:     p.yadav@...com, miquel.raynal@...tlin.com, richard@....at,
        vigneshr@...com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, nicolas.ferre@...rochip.com
Subject: Re: [PATCH v3 3/9] mtd: spi-nor: core: Use auto-detection only once

Am 2022-04-11 11:10, schrieb Tudor Ambarus:
> 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>
> ---
> v3:
> - caller of spi_nor_get_flash_info now handles NULL and translates it 
> to
> ENOENT.
> 
>  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;
> +	}

That is unnecessary, as spi_nor_match_name() doesn't
return an error code, just NULL or a valid pointer.

Apart from that:
Reviewed-by: Michael Walle <michael@...le.cc>

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