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Subject: Re: [PATCH] mmc: core: Fix error return code in sd_read_ext_regs()
To:     Ulf Hansson <ulf.hansson@linaro.org>
CC:     <linux-mmc@vger.kernel.org>, <linux-kernel@vger.kernel.org>
References: <20221130092847.2092-1-thunder.leizhen@huawei.com>
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From:   "Leizhen (ThunderTown)" <thunder.leizhen@huawei.com>
Message-ID: <fa77b721-387c-5de9-e8a8-7a55bd568372@huawei.com>
Date:   Wed, 30 Nov 2022 19:44:56 +0800
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On 2022/11/30 19:33, Ulf Hansson wrote:
> On Wed, 30 Nov 2022 at 12:18, Leizhen (ThunderTown)
> <thunder.leizhen@huawei.com> wrote:
>>
>>
>>
>> On 2022/11/30 18:04, Ulf Hansson wrote:
>>> On Wed, 30 Nov 2022 at 10:29, Zhen Lei <thunder.leizhen@huawei.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@huawei.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?

No, I don't have anything else to add.

I just saw the other two error outputs are also use pr_warn(). Maybe they
need to be changed to pr_err().

> 
>>
>>>
>>>>                 goto out;
>>>>         }
>>>>
> 
> Kind regards
> Uffe
> .
> 

-- 
Regards,
  Zhen Lei