linux-kernel - Re: [PATCH v2 07/51] mtd: nand: core: use mtd_ooblayout

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Date:	Fri, 5 Feb 2016 10:31:06 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	linux-mtd@...ts.infradead.org
Cc:	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	Josh Wu <josh.wu@...el.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
	Stefan Agner <stefan@...er.ch>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	punnaiah choudary kalluri <punnaia@...inx.com>,
	Priit Laes <plaes@...es.org>
Subject: Re: [PATCH v2 07/51] mtd: nand: core: use mtd_ooblayout_xxx()
 helpers where appropriate

On Thu,  4 Feb 2016 11:06:30 +0100
Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:

> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
>  drivers/mtd/nand/nand_base.c | 169 ++++++++++++++++++-------------------------
>  drivers/mtd/nand/nand_bch.c  |   3 +-
>  2 files changed, 74 insertions(+), 98 deletions(-)
> 
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index 572369d..e01a9b5 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c

[...]

> @@ -4116,7 +4092,6 @@ static bool nand_ecc_strength_good(struct mtd_info *mtd)
>   */
>  int nand_scan_tail(struct mtd_info *mtd)
>  {
> -	int i;
>  	struct nand_chip *chip = mtd_to_nand(mtd);
>  	struct nand_ecc_ctrl *ecc = &chip->ecc;
>  	struct nand_buffers *nbuf;
> @@ -4315,9 +4290,9 @@ int nand_scan_tail(struct mtd_info *mtd)
>  	 * The number of bytes available for a client to place data into
>  	 * the out of band area.
>  	 */
> -	mtd->oobavail = 0;
> -	for (i = 0; ecc->layout->oobfree[i].length; i++)
> -		mtd->oobavail += ecc->layout->oobfree[i].length;
> +	mtd->oobavail = mtd_ooblayout_count_freebytes(mtd);

We should call that after setting the mtd->ecclayout field.

> +	if (mtd->oobavail < 0)
> +		mtd->oobavail = 0;
>  
>  	/* ECC sanity check: warn if it's too weak */
>  	if (!nand_ecc_strength_good(mtd))



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com