linux-kernel - Re: [PATCH] mtd: spi-nor: fix erase_type array to indicate current map conf

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Date:   Thu, 22 Nov 2018 16:14:34 +0000
From:   "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>
To:     "Tudor.Ambarus@...rochip.com" <Tudor.Ambarus@...rochip.com>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "boris.brezillon@...tlin.com" <boris.brezillon@...tlin.com>,
        "richard@....at" <richard@....at>
CC:     "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: spi-nor: fix erase_type array to indicate current
 map conf

Hello Tudor,

On 22/11/2018 13:36, Tudor.Ambarus@...rochip.com wrote:
> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
> 
> Bug reported for the out-of-tree S25FS128S flash memory.
> 
> BFPT table advertises all the erase types supported by all the
> possible map configurations. Update the erase_type array to indicate
> which erase types are applicable to the current map configuration.
> 
> Backward compatibility test done on sst26vf064b.
> 
> Fixes: b038e8e3be72 ("mtd: spi-nor: parse SFDP Sector Map Parameter Table")
> Reported-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
>  drivers/mtd/spi-nor/spi-nor.c | 29 ++++++++++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 93c9bc8931fc..a71adcd6ddfa 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -3000,7 +3000,8 @@ static int spi_nor_init_non_uniform_erase_map(struct spi_nor *nor,
>  	u64 offset;
>  	u32 region_count;
>  	int i, j;
> -	u8 erase_type, uniform_erase_type;
> +	u8 uniform_erase_type, save_uniform_erase_type;
> +	u8 erase_type, regions_erase_type;
>  
>  	region_count = SMPT_MAP_REGION_COUNT(*smpt);
>  	/*
> @@ -3014,6 +3015,7 @@ static int spi_nor_init_non_uniform_erase_map(struct spi_nor *nor,
>  	map->regions = region;
>  
>  	uniform_erase_type = 0xff;
> +	regions_erase_type = 0;
>  	offset = 0;
>  	/* Populate regions. */
>  	for (i = 0; i < region_count; i++) {
> @@ -3030,13 +3032,38 @@ static int spi_nor_init_non_uniform_erase_map(struct spi_nor *nor,
>  		 */
>  		uniform_erase_type &= erase_type;
>  
> +		/*
> +		 * regions_erase_type mask will indicate all the erase types
> +		 * supported in this configuration map.
> +		 */
> +		regions_erase_type |= erase_type;
> +
>  		offset = (region[i].offset & ~SNOR_ERASE_FLAGS_MASK) +
>  			 region[i].size;
>  	}
>  
> +	save_uniform_erase_type = map->uniform_erase_type;
>  	map->uniform_erase_type = spi_nor_sort_erase_mask(map,
>  							  uniform_erase_type);
>  
> +	if (!regions_erase_type) {
> +		/*
> +		 * Roll back to the previous uniform_erase_type mask, SMPT is
> +		 * broken.
> +		 */
> +		map->uniform_erase_type = save_uniform_erase_type;
> +		return -EINVAL;
> +	}
> +
> +	/*
> +	 * BFPT table advertises all the erase types supported by all the
> +	 * possible map configurations. Update the erase_type array to indicate
> +	 * which erase types are applicable to the current map configuration.
> +	 */
> +	for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++)
> +		if (!(regions_erase_type & BIT(erase[i].idx)))
> +			spi_nor_set_erase_type(&erase[i], 0, 0xFF);

have you noticed the following:

.../drivers/mtd/spi-nor/spi-nor.c: In function ‘spi_nor_init_non_uniform_erase_map’:
.../drivers/mtd/spi-nor/spi-nor.c:2940:27: error: passing argument 1 of ‘spi_nor_set_erase_type’ discards ‘const’ qualifier
 from pointer target type [-Werror=discarded-qualifiers]
    spi_nor_set_erase_type(&erase[i], 0, 0xFF);
                           ^
.../drivers/mtd/spi-nor/spi-nor.c:2368:13: note: expected ‘struct spi_nor_erase_type *’ but argument is of type ‘const stru
ct spi_nor_erase_type *’
 static void spi_nor_set_erase_type(struct spi_nor_erase_type *erase,
             ^~~~~~~~~~~~~~~~~~~~~~

> +
>  	spi_nor_region_mark_end(&region[i - 1]);
>  
>  	return 0;

-- 
Best regards,
Alexander Sverdlin.