linux-kernel - Re: [PATCH v2] mtd: spi-nor: core: Skip setting erase types when SPI_NOR_NO

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Date:   Sat, 2 Apr 2022 01:35:56 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>
CC:     <michael@...le.cc>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <vigneshr@...com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH v2] mtd: spi-nor: core: Skip setting erase types when
 SPI_NOR_NO_ERASE is set

On 08/03/22 11:11AM, Tudor Ambarus wrote:
> Even if SPI_NOR_NO_ERASE was specified at flash declaration, the erase
> type of size nor->info->sector_size was incorrectly set as supported.
> Don't set erase types when SPI_NOR_NO_ERASE is set.

Does this have any practical implications? Since we set MTD_NO_ERASE, 
erase should never be called for this flash anyway, right?

> 
> Fixes: b199489d37b2 ("mtd: spi-nor: add the framework for SPI NOR")
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> Cc: stable@...r.kernel.org
> ---
> v2:
> - add comment, update commit message, split change in individual commit
> - add fixes tag and cc to stable.
> 
>  drivers/mtd/spi-nor/core.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index b4f141ad9c9c..64cf7b9df621 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -2392,6 +2392,10 @@ static void spi_nor_no_sfdp_init_params(struct spi_nor *nor)
>  					SPINOR_OP_PP, SNOR_PROTO_8_8_8_DTR);
>  	}
>  
> +	/* Skip setting erase types when SPI_NOR_NO_ERASE is set. */
> +	if (nor->info->flags & SPI_NOR_NO_ERASE)
> +		return;
> +
>  	/*
>  	 * Sector Erase settings. Sort Erase Types in ascending order, with the
>  	 * smallest erase size starting at BIT(0).
> -- 
> 2.25.1
> 

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.