linux-kernel - Re: [PATCH v7 3/3] mtd: rawnand: Add support for secure regions in NAND memory

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Date:   Fri, 19 Mar 2021 17:56:59 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        robh+dt@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Daniele.Palmas@...it.com,
        bjorn.andersson@...aro.org
Subject: Re: [PATCH v7 3/3] mtd: rawnand: Add support for secure regions in
 NAND memory

On Fri, 19 Mar 2021 20:30:10 +0530
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org> wrote:

> @@ -2737,6 +2783,11 @@ static int nand_read_page_swecc(struct nand_chip *chip, uint8_t *buf,
>  	uint8_t *ecc_code = chip->ecc.code_buf;
>  	unsigned int max_bitflips = 0;
>  
> +	/* Check if the region is secured */
> +	ret = nand_check_secure_region(chip, ((loff_t)page << chip->page_shift), 0);
> +	if (ret)
> +		return ret;
> +

I'm lost. Why do you need to do that here if it's already done in
nand_do_read_{ops,oob}()?

>  	chip->ecc.read_page_raw(chip, buf, 1, page);
>  
>  	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)