linux-kernel - Re: [PATCH v4 01/13] spi: airoha: return an error for continuous mode dirmap creation cases

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Message-ID: <aKl2Awfe4CIV2O44@lore-rh-laptop>
Date: Sat, 23 Aug 2025 10:04:19 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>
Cc: Ray Liu <ray.liu@...oha.com>, Mark Brown <broonie@...nel.org>,
	Jyothi Kumar Seerapu <quic_jseerapu@...cinc.com>,
	linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Frieder Schrempf <frieder.schrempf@...tron.de>
Subject: Re: [PATCH v4 01/13] spi: airoha: return an error for continuous
 mode dirmap creation cases

> This driver can accelerate single page operations only, thus
> continuous reading mode should not be used.
> 
> Continuous reading will use sizes up to the size of one erase block.
> This size is much larger than the size of single flash page. Use this
> difference to identify continuous reading and return an error.
> 
> Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>
> Reviewed-by: Frieder Schrempf <frieder.schrempf@...tron.de>

I guess here we need to add the proper Fixes tag:

Fixes: a403997c12019 ("spi: airoha: add SPI-NAND Flash controller driver")

> ---
>  drivers/spi/spi-airoha-snfi.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/spi/spi-airoha-snfi.c b/drivers/spi/spi-airoha-snfi.c
> index dbe640986825..043a03cd90a1 100644
> --- a/drivers/spi/spi-airoha-snfi.c
> +++ b/drivers/spi/spi-airoha-snfi.c
> @@ -618,6 +618,10 @@ static int airoha_snand_dirmap_create(struct spi_mem_dirmap_desc *desc)
>  	if (desc->info.offset + desc->info.length > U32_MAX)
>  		return -EINVAL;
>  
> +	/* continuous reading is not supported */
> +	if (desc->info.length > SPI_NAND_CACHE_SIZE)
> +		return -E2BIG;
> +
>  	if (!airoha_snand_supports_op(desc->mem, &desc->info.op_tmpl))
>  		return -EOPNOTSUPP;
>  
> -- 
> 2.50.1
> 

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