Re: [linux-sunxi] [PATCH 01/23] mtd: kill the ecclayout->oobavail field

From: Priit Laes <plaes@plaes.org>
To: boris.brezillon@free-electrons.com,
	David Woodhouse <dwmw2@infradead.org>,
	Brian Norris <computersforpeace@gmail.com>,
	linux-mtd@lists.infradead.org
Cc: Daniel Mack <daniel@zonque.org>,
	Haojian Zhuang <haojian.zhuang@gmail.com>,
	Robert Jarzmik <robert.jarzmik@free.fr>,
	Kukjin Kim <kgene@kernel.org>,
	Krzysztof Kozlowski <k.kozlowski@samsung.com>,
	linux-samsung-soc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Ralf Baechle <ralf@linux-mips.org>,
	linux-mips@linux-mips.org, Josh Wu <josh.wu@atmel.com>,
	Ezequiel Garcia <ezequiel.garcia@free-electrons.com>,
	Maxime Ripard <maxime.ripard@free-electrons.com>,
	Chen-Yu Tsai <wens@csie.org>,
	linux-sunxi@googlegroups.com, Stefan Agner <stefan@agner.ch>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
	punnaiah choudary kalluri <punnaia@xilinx.com>
Subject: Re: [linux-sunxi] [PATCH 01/23] mtd: kill the ecclayout->oobavail field
Date: Tue, 08 Dec 2015 08:43:05 +0200	[thread overview]
Message-ID: <1449556985.25438.8.camel@plaes.org> (raw)
In-Reply-To: <1449527178-5930-2-git-send-email-boris.brezillon@free-electrons.com>

On Mon, 2015-12-07 at 23:25 +0100, Boris Brezillon wrote:
> ecclayout->oobavail is just redundant with the mtd->oobavail field.
> Moreover, it prevents static const definition of ecc layouts since
> the
> NAND framework is calculating this value based on the ecclayout-
> >oobfree
> field.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>  drivers/mtd/devices/docg3.c                   |  5 ++-
>  drivers/mtd/mtdswap.c                         | 16 ++++-----
>  drivers/mtd/nand/brcmnand/brcmnand.c          |  3 --
>  drivers/mtd/nand/docg4.c                      |  1 -
>  drivers/mtd/nand/hisi504_nand.c               |  1 -
>  drivers/mtd/nand/nand_base.c                  | 12 +++----
>  drivers/mtd/onenand/onenand_base.c            | 16 ++++-----
>  drivers/mtd/tests/oobtest.c                   | 49 +++++++++++++--
> ------------
>  drivers/staging/mt29f_spinand/mt29f_spinand.c |  1 -
>  fs/jffs2/wbuf.c                               |  6 ++--
>  include/linux/mtd/mtd.h                       |  1 -
>  11 files changed, 48 insertions(+), 63 deletions(-)
> 
[..]
>  
> diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c
> b/drivers/mtd/nand/brcmnand/brcmnand.c
> index 35d78f7..a906ec2 100644
> --- a/drivers/mtd/nand/brcmnand/brcmnand.c
> +++ b/drivers/mtd/nand/brcmnand/brcmnand.c
> @@ -845,9 +845,6 @@ static struct nand_ecclayout *brcmnand_create_layout(int ecc_level,
>  			break;
>  	}
>  out:
> -	/* Sum available OOB */
> -	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES_LARGE; i++)
> -		layout->oobavail += layout->oobfree[i].length;
>  	return layout;
>  }

You can get rid of the 'out' label and replace the single goto in this
function with 'return layout'.

[...]
>  
> diff --git a/drivers/mtd/nand/nand_base.c
> b/drivers/mtd/nand/nand_base.c
> index 0748a13..1107f5c1 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -2037,7 +2037,7 @@ static int nand_do_read_oob(struct mtd_info
> *mtd, loff_t from,
>  	stats = mtd->ecc_stats;
>  
>  	if (ops->mode == MTD_OPS_AUTO_OOB)
> -		len = chip->ecc.layout->oobavail;
> +		len = mtd->oobavail;
>  	else
>  		len = mtd->oobsize;
>  
> @@ -2728,7 +2728,7 @@ static int nand_do_write_oob(struct mtd_info
> *mtd, loff_t to,
>  			 __func__, (unsigned int)to, (int)ops-
> >ooblen);
>  
>  	if (ops->mode == MTD_OPS_AUTO_OOB)
> -		len = chip->ecc.layout->oobavail;
> +		len = mtd->oobavail;
>  	else
>  		len = mtd->oobsize;
>  
[...]
> diff --git a/drivers/mtd/onenand/onenand_base.c
> b/drivers/mtd/onenand/onenand_base.c
> index 43b3392..d70bbfd 100644
> --- a/drivers/mtd/onenand/onenand_base.c
> +++ b/drivers/mtd/onenand/onenand_base.c
> @@ -1125,7 +1125,7 @@ static int onenand_mlc_read_ops_nolock(struct
> mtd_info *mtd, loff_t from,
>  			(int)len);
>  
>  	if (ops->mode == MTD_OPS_AUTO_OOB)
> -		oobsize = this->ecclayout->oobavail;
> +		oobsize = mtd->oobavail;
>  	else
>  		oobsize = mtd->oobsize;
>  
> @@ -1230,7 +1230,7 @@ static int onenand_read_ops_nolock(struct
> mtd_info *mtd, loff_t from,
>  			(int)len);
>  
>  	if (ops->mode == MTD_OPS_AUTO_OOB)
> -		oobsize = this->ecclayout->oobavail;
> +		oobsize = mtd->oobavail;
>  	else
>  		oobsize = mtd->oobsize;
>  
> @@ -1365,7 +1365,7 @@ static int onenand_read_oob_nolock(struct
> mtd_info *mtd, loff_t from,
>  	ops->oobretlen = 0;
>  
>  	if (mode == MTD_OPS_AUTO_OOB)
> -		oobsize = this->ecclayout->oobavail;
> +		oobsize = mtd->oobavail;
>  	else
>  		oobsize = mtd->oobsize;
>  
> @@ -1887,7 +1887,7 @@ static int onenand_write_ops_nolock(struct
> mtd_info *mtd, loff_t to,
>  		return 0;
>  
>  	if (ops->mode == MTD_OPS_AUTO_OOB)
> -		oobsize = this->ecclayout->oobavail;
> +		oobsize = mtd->oobavail;
>  	else
>  		oobsize = mtd->oobsize;
>  
> @@ -2063,7 +2063,7 @@ static int onenand_write_oob_nolock(struct
> mtd_info *mtd, loff_t to,
>  	ops->oobretlen = 0;
>  
>  	if (mode == MTD_OPS_AUTO_OOB)
> -		oobsize = this->ecclayout->oobavail;
> +		oobsize = mtd->oobavail;
>  	else
>  		oobsize = mtd->oobsize;

This identical construction seems to occur multiple times in multiple
files. Would it make sense to create a macro for it?

Päikest,
Priit Laes :)