linux-kernel - Re: [PATCH] mmc: core: Fix error return code in sd_read_ext

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Date:   Wed, 30 Nov 2022 12:33:24 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: core: Fix error return code in sd_read_ext_regs()

On Wed, 30 Nov 2022 at 12:18, Leizhen (ThunderTown)
<thunder.leizhen@...wei.com> wrote:
>
>
>
> On 2022/11/30 18:04, Ulf Hansson wrote:
> > On Wed, 30 Nov 2022 at 10:29, Zhen Lei <thunder.leizhen@...wei.com> wrote:
> >>
> >> Fix to return a negative error code from the error handling
> >> case instead of 0, as done elsewhere in this function.
> >>
> >> Fixes: c784f92769ae ("mmc: core: Read the SD function extension registers for power management")
> >> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> >> ---
> >>  drivers/mmc/core/sd.c | 1 +
> >>  1 file changed, 1 insertion(+)
> >>
> >> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
> >> index 3662bf5320ce56d..7b64f76f0179ca8 100644
> >> --- a/drivers/mmc/core/sd.c
> >> +++ b/drivers/mmc/core/sd.c
> >> @@ -1277,6 +1277,7 @@ static int sd_read_ext_regs(struct mmc_card *card)
> >>         if (rev != 0 || len > 512) {
> >>                 pr_warn("%s: non-supported SD ext reg layout\n",
> >>                         mmc_hostname(card->host));
> >> +               err = -EOPNOTSUPP;
> >
> > The original intent was to not return an error code. Simply, because
> > the card remains functional and all but the new features from the SD
> > function extensions registers can still be used.
>
> OK, I got it.
>
> >
> > Perhaps, we should update the comment a few lines above to better
> > reflect that this is in-fact what we intend here.
>
> How about also add 'warning' to the output? The other two outputs
> contain the 'error' keyword.

There is already a pr_warn(), or is there something you want to add to that?

>
> >
> >>                 goto out;
> >>         }
> >>

Kind regards
Uffe