linux-kernel - Re: [PATCH] mtd: spi-nor: Get rid of duplicated argument in spi_nor_parse

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Message-ID: <20210205134625.6zmeit7ecqtzwyin@ti.com>
Date:   Fri, 5 Feb 2021 19:16:25 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: spi-nor: Get rid of duplicated argument in
 spi_nor_parse_sfdp()

On 04/02/21 07:45PM, Tudor Ambarus wrote:
> spi_nor_parse_sfdp(nor, nor->params);
> passes for the second argument a member within the first argument.
> Drop the second argument and obtain it directly from the first,
> and do it across all the children functions. This is a follow up for
> 'commit 69a8eed58cc0 ("mtd: spi-nor: Don't copy self-pointing struct around")'
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
>  drivers/mtd/spi-nor/core.c     | 10 ++--
>  drivers/mtd/spi-nor/core.h     |  6 +--
>  drivers/mtd/spi-nor/issi.c     |  3 +-
>  drivers/mtd/spi-nor/macronix.c |  3 +-
>  drivers/mtd/spi-nor/sfdp.c     | 87 +++++++++++++---------------------
>  drivers/mtd/spi-nor/sfdp.h     |  3 +-
>  drivers/mtd/spi-nor/spansion.c | 12 ++---
>  drivers/mtd/spi-nor/winbond.c  |  3 +-
>  8 files changed, 49 insertions(+), 78 deletions(-)
> 
[...]
> @@ -945,13 +935,11 @@ static int spi_nor_parse_smpt(struct spi_nor *nor,
>   * @nor:		pointer to a 'struct spi_nor'.
>   * @param_header:	pointer to the 'struct sfdp_parameter_header' describing
>   *			the 4-Byte Address Instruction Table length and version.
> - * @params:		pointer to the 'struct spi_nor_flash_parameter' to be.
>   *
>   * Return: 0 on success, -errno otherwise.
>   */
>  static int spi_nor_parse_4bait(struct spi_nor *nor,
> -			       const struct sfdp_parameter_header *param_header,
> -			       struct spi_nor_flash_parameter *params)
> +			       const struct sfdp_parameter_header *param_header)
>  {
>  	static const struct sfdp_4bait reads[] = {
>  		{ SNOR_HWCAPS_READ,		BIT(0) },
> @@ -975,8 +963,8 @@ static int spi_nor_parse_4bait(struct spi_nor *nor,
>  		{ 0u /* not used */,		BIT(11) },
>  		{ 0u /* not used */,		BIT(12) },
>  	};
> -	struct spi_nor_pp_command *params_pp = params->page_programs;
> -	struct spi_nor_erase_map *map = &params->erase_map;
> +	struct spi_nor_pp_command *params_pp = nor->params->page_programs;
> +	struct spi_nor_erase_map *map = &nor->params->erase_map;
>  	struct spi_nor_erase_type *erase_type = map->erase_type;
>  	u32 *dwords;
>  	size_t len;
> @@ -1013,7 +1001,7 @@ static int spi_nor_parse_4bait(struct spi_nor *nor,
>  		const struct sfdp_4bait *read = &reads[i];
>  
>  		discard_hwcaps |= read->hwcaps;
> -		if ((params->hwcaps.mask & read->hwcaps) &&
> +		if ((nor->params->hwcaps.mask & read->hwcaps) &&
>  		    (dwords[0] & read->supported_bit))
>  			read_hwcaps |= read->hwcaps;
>  	}
> @@ -1029,8 +1017,8 @@ static int spi_nor_parse_4bait(struct spi_nor *nor,
>  		/*
>  		 * The 4 Byte Address Instruction (Optional) Table is the only
>  		 * SFDP table that indicates support for Page Program Commands.
> -		 * Bypass the params->hwcaps.mask and consider 4BAIT the biggest
> -		 * authority for specifying Page Program support.
> +		 * Bypass the nor->params->hwcaps.mask and consider 4BAIT the
> +		 * biggest authority for specifying Page Program support.
>  		 */
>  		discard_hwcaps |= program->hwcaps;
>  		if (dwords[0] & program->supported_bit)
> @@ -1064,12 +1052,12 @@ static int spi_nor_parse_4bait(struct spi_nor *nor,
>  	 * Discard all operations from the 4-byte instruction set which are
>  	 * not supported by this memory.
>  	 */
> -	params->hwcaps.mask &= ~discard_hwcaps;
> -	params->hwcaps.mask |= (read_hwcaps | pp_hwcaps);
> +	nor->params->hwcaps.mask &= ~discard_hwcaps;
> +	nor->params->hwcaps.mask |= (read_hwcaps | pp_hwcaps);
>  
>  	/* Use the 4-byte address instruction set. */
>  	for (i = 0; i < SNOR_CMD_READ_MAX; i++) {
> -		struct spi_nor_read_command *read_cmd = &params->reads[i];
> +		struct spi_nor_read_command *read_cmd = &nor->params->reads[i];

Nitpick: 'nor->params' is used in multiple places in this function. 
Might be worth it to make it a local variable.

Either way,

Reviewed-by: Pratyush Yadav <p.yadav@...com>

>  
>  		read_cmd->opcode = spi_nor_convert_3to4_read(read_cmd->opcode);
>  	}
[...]

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.