linux-kernel - Re: [PATCH] mtd: spi-nor: core: Add an error message when failing to exit the 4-byte address mode

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Message-ID: <27c95d5e17906f5e45c04cec7c1bda9d@walle.cc>
Date:   Thu, 28 Jul 2022 14:15:05 +0200
From:   Michael Walle <michael@...le.cc>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>
Cc:     pratyush@...nel.org, miquel.raynal@...tlin.com, richard@....at,
        vigneshr@...com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Pratyush Yadav <p.yadav@...com>
Subject: Re: [PATCH] mtd: spi-nor: core: Add an error message when failing to
 exit the 4-byte address mode

Hi,

Am 2022-07-28 05:01, schrieb Tudor Ambarus:
> Add an error message when failing to exit the 4-byte address mode. Do 
> not
> stop the execution and go through the spi_nor_soft_reset() method if 
> used,
> in the hope that the flash will default to 3-byte address mode after 
> the
> reset.
> 
> Suggested-by: Pratyush Yadav <p.yadav@...com>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
>  drivers/mtd/spi-nor/core.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index f2c64006f8d7..1cdbdad97136 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -2841,7 +2841,8 @@ void spi_nor_restore(struct spi_nor *nor)
>  	/* restore the addressing mode */
>  	if (nor->addr_nbytes == 4 && !(nor->flags & SNOR_F_4B_OPCODES) &&
>  	    nor->flags & SNOR_F_BROKEN_RESET)
> -		nor->params->set_4byte_addr_mode(nor, false);
> +		if (nor->params->set_4byte_addr_mode(nor, false))
> +			dev_err(nor->dev, "Failed to exit 4-byte address mode\n");

Could we stick to the ususal pattern:

ret = func()
if (ret)
    err("blubb (%d)", ret);

I know it is more lines but imho it makes the code much more readable.
And that way you could also print the error code. You could also use
dev_err("bla (%pe)\n", ERR_PTR(ret));

-michael