linux-kernel - Re: [PATCH 2/2] mxc_nand: use our own read

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Message-ID: <20140627091917.GD20413@pengutronix.de>
Date:	Fri, 27 Jun 2014 11:19:17 +0200
From:	Michael Grzeschik <mgr@...gutronix.de>
To:	Michael Grzeschik <m.grzeschik@...gutronix.de>
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dwmw2@...radead.org, kernel@...gutronix.de
Subject: Re: [PATCH 2/2] mxc_nand: use our own read_page function

On Thu, Jun 26, 2014 at 10:42:48PM +0200, Michael Grzeschik wrote:
> The current approach of the read_page function is to iterate over all
> subpages and call the correct_data function. The correct_data function
> currently does the same. It iterates over all subpages and checks for
> correctable and uncorrectable data. This redundant call for each
> subpage leads to miscalculations.
> 
> This patch changes the driver to use its own read_page function in which
> we call the correct_data function only once per page. With that we do
> the failure and correct statistics counting inside this function.
> 
> Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
> ---
>  drivers/mtd/nand/mxc_nand.c | 73 ++++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 69 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
> index 7fd495e..09e3682 100644
> --- a/drivers/mtd/nand/mxc_nand.c
> +++ b/drivers/mtd/nand/mxc_nand.c

[snip]

> @@ -673,15 +728,21 @@ static int mxc_nand_correct_data_v2_v3(struct mtd_info *mtd, u_char *dat,
>  	do {
>  		err = ecc_stat & ecc_bit_mask;
>  		if (err > err_limit) {
> -			printk(KERN_WARNING "UnCorrectable RS-ECC Error\n");
> -			return -1;
> +			broken++;
>  		} else {
>  			ret += err;
>  		}
>  		ecc_stat >>= 4;
>  	} while (--no_subpages);
>  
> -	pr_debug("%d Symbol Correctable RS-ECC Error\n", ret);
> +	mtd->ecc_stats.corrected += ret;
> +	if (ret)
> +		printk("%d Symbol Correctable RS-ECC Error\n", ret);

This was ment to be pr_debug as before.

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