linux-kernel - Re: [PATCH] mtd: spi-nor: Fix the disabling of write protection at init

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Message-ID: <6bc1b181-a439-77c3-5162-a032a5f21b08@ti.com>
Date:   Mon, 5 Aug 2019 12:10:32 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     <Tudor.Ambarus@...rochip.com>, <marek.vasut@...il.com>
CC:     <dwmw2@...radead.org>, <computersforpeace@...il.com>,
        <miquel.raynal@...tlin.com>, <richard@....at>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: spi-nor: Fix the disabling of write protection at
 init



On 31/07/19 2:16 PM, Tudor.Ambarus@...rochip.com wrote:
> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
> 
> spi_nor_spansion_clear_sr_bp() depends on spansion_quad_enable().
> While spansion_quad_enable() is selected as default when
> initializing the flash parameters, the nor->quad_enable() method
> can be overwritten later on when parsing BFPT.
> 
> Select the write protection disable mechanism at spi_nor_init() time,
> when the nor->quad_enable() method is already known.
> 
> Fixes: 191f5c2ed4b6faba ("mtd: spi-nor: use 16-bit WRR command when QE is set on spansion flashes")
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>

Reviewed-by: Vignesh Raghavendra <vigneshr@...com>

> ---
>  drivers/mtd/spi-nor/spi-nor.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 924dbaf3fa49..28a64dbdaea9 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -4357,8 +4357,6 @@ static int spi_nor_init_params(struct spi_nor *nor,
>  		default:
>  			/* Kept only for backward compatibility purpose. */
>  			params->quad_enable = spansion_quad_enable;
> -			if (nor->clear_sr_bp)
> -				nor->clear_sr_bp = spi_nor_spansion_clear_sr_bp;
>  			break;
>  		}
>  
> @@ -4621,6 +4619,9 @@ static int spi_nor_init(struct spi_nor *nor)
>  	int err;
>  
>  	if (nor->clear_sr_bp) {
> +		if (nor->quad_enable == spansion_quad_enable)
> +			nor->clear_sr_bp = spi_nor_spansion_clear_sr_bp;
> +
>  		err = nor->clear_sr_bp(nor);
>  		if (err) {
>  			dev_err(nor->dev,
> 

-- 
Regards
Vignesh