[PATCH] mtd: nand: remove hard-coded NAND ids length

[Boris Brezillon]

Le Thu, 29 Jun 2017 19:08:30 +0200,
Jean-Louis Thekekara <jeanlouis.thekekara at parrot.com> a écrit :

> This commit removes hard-coded '8' used for looping into
> struct nand_chip.id.data array.
> 
> NAND_MAX_ID_LEN has been introduced by Artem Bityutskiy in
> 53552d22bfe1f for defining ids length in nand_flash_ids[] list.
> 
> This commit unifies ids length in nand base driver.
> 
> Signed-off-by: Jean-Louis Thekekara <jeanlouis.thekekara at parrot.com>

LGTM. I'll apply to nand/next once 4.13-rc1 is out.

Just a note for your future MTD/NAND contributions, can you please Cc
NAND/MTD maintainers (you can get the list with
scripts/get_maintainers.pl ;-)).

> ---
>  drivers/mtd/nand/nand_base.c |  4 ++--
>  include/linux/mtd/nand.h     | 10 +++++-----
>  2 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index 85edac9b2bb5..66db2ced87ad 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -4056,7 +4056,7 @@ static int nand_detect(struct nand_chip *chip, struct nand_flash_dev *type)
>  	chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
>  
>  	/* Read entire ID string */
> -	for (i = 0; i < 8; i++)
> +	for (i = 0; i < ARRAY_SIZE(chip->id.data); i++)
>  		id_data[i] = chip->read_byte(mtd);
>  
>  	if (id_data[0] != maf_id || id_data[1] != dev_id) {
> @@ -4065,7 +4065,7 @@ static int nand_detect(struct nand_chip *chip, struct nand_flash_dev *type)
>  		return -ENODEV;
>  	}
>  
> -	chip->id.len = nand_id_len(id_data, 8);
> +	chip->id.len = nand_id_len(id_data, ARRAY_SIZE(chip->id.data));
>  
>  	/* Try to identify manufacturer */
>  	manufacturer = nand_get_manufacturer(maf_id);
> diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> index dc8fbc033442..c3c1a32a5ade 100644
> --- a/include/linux/mtd/nand.h
> +++ b/include/linux/mtd/nand.h
> @@ -449,14 +449,16 @@ struct nand_jedec_params {
>  	__le16 crc;
>  } __packed;
>  
> +/* The maximum expected count of bytes in the NAND ID sequence */
> +#define NAND_MAX_ID_LEN 8
> +
>  /**
>   * struct nand_id - NAND id structure
> - * @data: buffer containing the id bytes. Currently 8 bytes large, but can
> - *	  be extended if required.
> + * @data: buffer containing the id bytes.
>   * @len: ID length.
>   */
>  struct nand_id {
> -	u8 data[8];
> +	u8 data[NAND_MAX_ID_LEN];
>  	int len;
>  };
>  
> @@ -1028,8 +1030,6 @@ static inline void *nand_get_manufacturer_data(struct nand_chip *chip)
>  #define NAND_MFR_ATO		0x9b
>  #define NAND_MFR_WINBOND	0xef
>  
> -/* The maximum expected count of bytes in the NAND ID sequence */
> -#define NAND_MAX_ID_LEN 8
>  
>  /*
>   * A helper for defining older NAND chips where the second ID byte fully