linux-kernel - RE: [PATCH v2 1/5] mtd: spi-nor: don't drop sfdp data if optional parsers fail

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Date:   Tue, 13 Nov 2018 06:29:31 +0000
From:   Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
To:     "Tudor.Ambarus@...rochip.com" <Tudor.Ambarus@...rochip.com>,
        "boris.brezillon@...tlin.com" <boris.brezillon@...tlin.com>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.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>,
        "cyrille.pitchen@...ev4u.fr" <cyrille.pitchen@...ev4u.fr>
Subject: RE: [PATCH v2 1/5] mtd: spi-nor: don't drop sfdp data if optional
 parsers fail

> -----Original Message-----
> From: Tudor.Ambarus@...rochip.com [mailto:Tudor.Ambarus@...rochip.com]
> Sent: Friday, November 9, 2018 10:27 PM
> To: boris.brezillon@...tlin.com; marek.vasut@...il.com;
> dwmw2@...radead.org; computersforpeace@...il.com; richard@....at
> Cc: linux-mtd@...ts.infradead.org; linux-kernel@...r.kernel.org; Yogesh
> Narayan Gaur <yogeshnarayan.gaur@....com>; cyrille.pitchen@...ev4u.fr;
> Tudor.Ambarus@...rochip.com
> Subject: [PATCH v2 1/5] mtd: spi-nor: don't drop sfdp data if optional parsers fail
> 
> JESD216C states that just the Basic Flash Parameter Table is mandatory.
> Already defined (or future) additional parameter headers and tables are optional.
> 
> Don't drop already collected sfdp data in case an optional table parser fails. In
> case of failing, each optional parser is responsible to roll back to the previously
> known spi_nor data.
> 
> Fixes: b038e8e3be72 ("mtd: spi-nor: parse SFDP Sector Map Parameter Table")
> Reported-by: Yogesh Gaur <yogeshnarayan.gaur@....com>
Tested-by: Yogesh Gaur <yogeshnarayan.gaur@....com>

> Suggested-by: Boris Brezillon <boris.brezillon@...tlin.com>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
> v2: update Fixes tag to point to correct commit
> 
>  drivers/mtd/spi-nor/spi-nor.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index
> 4a96ee719e5a..2cdf96013689 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -3130,7 +3130,7 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
>  	if (err)
>  		goto exit;
> 
> -	/* Parse other parameter headers. */
> +	/* Parse optional parameter tables. */
>  	for (i = 0; i < header.nph; i++) {
>  		param_header = &param_headers[i];
> 
> @@ -3143,8 +3143,17 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
>  			break;
>  		}
> 
> -		if (err)
> -			goto exit;
> +		if (err) {
> +			dev_warn(dev, "Failed to parse optional parameter
> table: %04x\n",
> +				 SFDP_PARAM_HEADER_ID(param_header));
> +			/*
> +			 * Let's not drop all information we extracted so far
> +			 * if optional table parsers fail. In case of failing,
> +			 * each optional parser is responsible to roll back to
> +			 * the previously known spi_nor data.
> +			 */
> +			err = 0;
> +		}
>  	}
> 
>  exit:
> --
> 2.9.4