Re: [PATCH v3 3/9] mtd: spi-nor: core: Use auto-detection only once

Michael Walle
2022-04-19T10:19:07Z

Am 2022-04-11 11:10, schrieb Tudor Ambarus:
> In case spi_nor_match_name() returned NULL, the auto detection was
> issued twice. There's no reason to try to detect the same chip twice,
> do the auto detection only once.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
> ---
> v3:
> - caller of spi_nor_get_flash_info now handles NULL and translates it
> to
> ENOENT.
>
> drivers/mtd/spi-nor/core.c | 13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index b9cc8bbf1f62..b55d922d46dd 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -2896,13 +2896,14 @@ static const struct flash_info
> *spi_nor_get_flash_info(struct spi_nor *nor,
> {
> const struct flash_info *info = NULL;
>
> - if (name)
> + if (name) {
> info = spi_nor_match_name(nor, name);
> + if (IS_ERR(info))
> + return info;
> + }

That is unnecessary, as spi_nor_match_name() doesn't
return an error code, just NULL or a valid pointer.

Apart from that:
Reviewed-by: Michael Walle <michael@walle.cc>

> /* Try to auto-detect if chip name wasn't specified or not found */
> if (!info)
> - info = spi_nor_read_id(nor);
> - if (IS_ERR_OR_NULL(info))
> - return ERR_PTR(-ENOENT);
> + return spi_nor_read_id(nor);
>
> /*
> * If caller has specified name of flash model that can normally be
> @@ -2994,7 +2995,9 @@ int spi_nor_scan(struct spi_nor *nor, const char
> *name,
> return -ENOMEM;
>
> info = spi_nor_get_flash_info(nor, name);
> - if (IS_ERR(info))
> + if (!info)
> + return -ENOENT;
> + else if (IS_ERR(info))
> return PTR_ERR(info);
>
> nor->info = info;