linux-kernel - Re: [PATCH v2 11/53] mtd: nand: denali: fix bitflips calculation in handle

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Date:   Wed, 22 Mar 2017 21:57:28 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mtd@...ts.infradead.org, laurent.monat@...uantique.com,
        thorsten.christiansson@...uantique.com,
        Enrico Jorns <ejo@...gutronix.de>,
        Jason Roberts <jason.e.roberts@...el.com>,
        Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Graham Moore <grmoore@...nsource.altera.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Chuanxiao Dong <chuanxiao.dong@...el.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>
Subject: Re: [PATCH v2 11/53] mtd: nand: denali: fix bitflips calculation in
 handle_ecc()

On Wed, 22 Mar 2017 23:07:18 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:

> +	do {
> +		err_addr = ioread32(denali->flash_reg + ECC_ERROR_ADDRESS);
> +		err_sector = ECC_SECTOR(err_addr);
> +		err_byte = ECC_BYTE(err_addr);
> +
> +		err_cor_info = ioread32(denali->flash_reg + ERR_CORRECTION_INFO);
> +		err_cor_value = ECC_CORRECTION_VALUE(err_cor_info);
> +		err_device = ECC_ERR_DEVICE(err_cor_info);
> +
> +		/* reset the bitflip counter when crossing ECC sector */
> +		if (err_sector != prev_sector)
> +			bitflips = 0;
> +
> +		if (ECC_ERROR_UNCORRECTABLE(err_cor_info)) {
> +			/*
> +			 * if the error is not correctable, need to look at the
> +			 * page to see if it is an erased page. if so, then
> +			 * it's not a real ECC error
> +			 */
> +			ret = -EBADMSG;

You should never return -EBADMSG directly. Just increment
ecc_stats.failed and let the core return -EBADMSG to the upper layer.