linux-kernel - Re: [PATCH v2] mtd: nand: omap: drop condition with no effect

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Date:	Thu, 05 Feb 2015 07:50:26 +0530
From:	pekon <pekon@...-sem.com>
To:	Nicholas Mc Guire <hofrat@...dl.org>,
	David Woodhouse <dwmw2@...radead.org>
CC:	Roger Quadros <rogerq@...com>, Tony Lindgren <tony@...mide.com>,
	linux-kernel@...r.kernel.org, Rostislav Lisovy <lisovy@...il.com>,
	linux-mtd@...ts.infradead.org,
	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	Brian Norris <computersforpeace@...il.com>,
	pekon gupta <pekon@...com>
Subject: Re: [PATCH v2] mtd: nand: omap: drop condition with no effect

On Wednesday 04 February 2015 10:54 PM, Nicholas Mc Guire wrote:
> The if and the else branch code are identical - so the condition has no
> effect on the effective code. This patch removes the condition and the
> duplicated code and updates the documentation as suggested by
> Roger Quadros <rogerq@...com>.
>
> Acked-by: Roger Quadros <rogerq@...com>
> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
> ---
>
> v2: Confirmation of proposed patch and update of the related documentation
>      as provided by Roger Quadros <rogerq@...com>
>
> The conditions in the OMAP_ECC_BCH8_CODE_HW_DETECTION_SW and
> OMAP_ECC_BCH4_CODE_HW_DETECTION_SW case have no effect and can
> be removed.
>
> Patch was only compile tested with arm-linux-gnueabi-4.7-, current
> crosstool-ng did not seem to build omap2 properly.
> Config is omap2plus_defconfig which implies CONFIG_MTD_NAND_OMAP2=y.
>
> Patch is against 3.19.0-rc7 (localversion-next is -next-20150204)
>
>   drivers/mtd/nand/omap2.c |   31 +++++++++----------------------
>   1 file changed, 9 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 63f858e..60fa899 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1048,10 +1048,9 @@ static int omap_dev_ready(struct mtd_info *mtd)
>    * @mtd: MTD device structure
>    * @mode: Read/Write mode
>    *
> - * When using BCH, sector size is hardcoded to 512 bytes.
> - * Using wrapping mode 6 both for reading and writing if ELM module not uses
> - * for error correction.
> - * On writing,
> + * When using BCH with SW correction (i.e. no ELM), sector size is set
> + * to 512 bytes and we use BCH_WRAPMODE_6 wrapping mode
> + * for both reading and writing with:
>    * eccsize0 = 0  (no additional protected byte in spare area)
>    * eccsize1 = 32 (skip 32 nibbles = 16 bytes per sector in spare area)
>    */
> @@ -1071,15 +1070,9 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
>   	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
>   		bch_type = 0;
>   		nsectors = 1;
> -		if (mode == NAND_ECC_READ) {
> -			wr_mode	  = BCH_WRAPMODE_6;
> -			ecc_size0 = BCH_ECC_SIZE0;
> -			ecc_size1 = BCH_ECC_SIZE1;
> -		} else {
> -			wr_mode   = BCH_WRAPMODE_6;
> -			ecc_size0 = BCH_ECC_SIZE0;
> -			ecc_size1 = BCH_ECC_SIZE1;
> -		}
> +		wr_mode	  = BCH_WRAPMODE_6;
> +		ecc_size0 = BCH_ECC_SIZE0;
> +		ecc_size1 = BCH_ECC_SIZE1;
>   		break;
>   	case OMAP_ECC_BCH4_CODE_HW:
>   		bch_type = 0;
> @@ -1097,15 +1090,9 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
>   	case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
>   		bch_type = 1;
>   		nsectors = 1;
> -		if (mode == NAND_ECC_READ) {
> -			wr_mode	  = BCH_WRAPMODE_6;
> -			ecc_size0 = BCH_ECC_SIZE0;
> -			ecc_size1 = BCH_ECC_SIZE1;
> -		} else {
> -			wr_mode   = BCH_WRAPMODE_6;
> -			ecc_size0 = BCH_ECC_SIZE0;
> -			ecc_size1 = BCH_ECC_SIZE1;
> -		}
> +		wr_mode	  = BCH_WRAPMODE_6;
> +		ecc_size0 = BCH_ECC_SIZE0;
> +		ecc_size1 = BCH_ECC_SIZE1;
>   		break;
>   	case OMAP_ECC_BCH8_CODE_HW:
>   		bch_type = 1;
>
Thanks for the clean-up ..
Reviewed-by: Pekon Gupta <pekon@...-sem.com>

with regards, pekon

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