linux-kernel - Re: [PATCH v2] mmc: core: Normalize the error handling branch in sd_read_ext

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Date:   Wed, 30 Nov 2022 15:43:59 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Zhen Lei <thunder.leizhen@...wei.com>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mmc: core: Normalize the error handling branch in sd_read_ext_regs()

On Wed, 30 Nov 2022 at 14:49, Zhen Lei <thunder.leizhen@...wei.com> wrote:
>
> 1. Use pr_err() to output the error message.
> 2. Add the description of why success 0 is returned in case
>    "non-supported SD ext reg layout".
>
> Fixes: c784f92769ae ("mmc: core: Read the SD function extension registers for power management")
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/core/sd.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
> index 3662bf5320ce56d..93ee53f74427c38 100644
> --- a/drivers/mmc/core/sd.c
> +++ b/drivers/mmc/core/sd.c
> @@ -1259,7 +1259,7 @@ static int sd_read_ext_regs(struct mmc_card *card)
>          */
>         err = sd_read_ext_reg(card, 0, 0, 0, 512, gen_info_buf);
>         if (err) {
> -               pr_warn("%s: error %d reading general info of SD ext reg\n",
> +               pr_err("%s: error %d reading general info of SD ext reg\n",
>                         mmc_hostname(card->host), err);
>                 goto out;
>         }
> @@ -1273,7 +1273,12 @@ static int sd_read_ext_regs(struct mmc_card *card)
>         /* Number of extensions to be find. */
>         num_ext = gen_info_buf[4];
>
> -       /* We support revision 0, but limit it to 512 bytes for simplicity. */
> +       /*
> +        * We only support revision 0, and limit it to 512 bytes for simplicity.
> +        * In other cases, success 0 is returned, because the card remains
> +        * functional and all but the new features from the SD function
> +        * extensions registers can still be used.
> +        */
>         if (rev != 0 || len > 512) {
>                 pr_warn("%s: non-supported SD ext reg layout\n",
>                         mmc_hostname(card->host));
> @@ -1288,7 +1293,7 @@ static int sd_read_ext_regs(struct mmc_card *card)
>         for (i = 0; i < num_ext; i++) {
>                 err = sd_parse_ext_reg(card, gen_info_buf, &next_ext_addr);
>                 if (err) {
> -                       pr_warn("%s: error %d parsing SD ext reg\n",
> +                       pr_err("%s: error %d parsing SD ext reg\n",
>                                 mmc_hostname(card->host), err);
>                         goto out;
>                 }
> --
> 2.25.1
>