linux-kernel - Re: [PATCH v2 06/14] mmc: dw_mmc: simplify optional reset handling

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Date:   Tue, 21 Mar 2017 21:12:20 +0900
From:   Jaehoon Chung <jh80.chung@...sung.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Szyprowski, Marek" <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH v2 06/14] mmc: dw_mmc: simplify optional reset handling

Hi All,

On 03/21/2017 03:10 AM, Ulf Hansson wrote:
> On 20 March 2017 at 12:00, Philipp Zabel <p.zabel@...gutronix.de> wrote:
>> On Mon, 2017-03-20 at 11:49 +0100, Andrzej Hajda wrote:
>>> On 20.03.2017 11:27, Philipp Zabel wrote:
>> [...]
>>>> diff --git a/include/linux/reset.h b/include/linux/reset.h
>>>> index 86b4ed75359e8..c905ff1c21ec6 100644
>>>> --- a/include/linux/reset.h
>>>> +++ b/include/linux/reset.h
>>>> @@ -74,14 +74,14 @@ static inline struct reset_control *__of_reset_control_get(
>>>>                                     const char *id, int index, bool shared,
>>>>                                     bool optional)
>>>>  {
>>>> -   return ERR_PTR(-ENOTSUPP);
>>>> +   return optional ? NULL : ERR_PTR(-ENOTSUPP);
>>>>  }
>>>>
>>>>  static inline struct reset_control *__devm_reset_control_get(
>>>>                                     struct device *dev, const char *id,
>>>>                                     int index, bool shared, bool optional)
>>>>  {
>>>> -   return ERR_PTR(-ENOTSUPP);
>>>> +   return optional ? NULL : ERR_PTR(-ENOTSUPP);
>>>>  }
>>>>
>>>>  #endif /* CONFIG_RESET_CONTROLLER */
>>>> ---------->8----------
>>>
>>> In dw_mmc.c file there are also unconditional calls to
>>> reset_control_assert, with disabled RESET_CONTROLLER it will cause
>>> unexpected WARNs.
>>> Anyway if you change reset API as above I think you should remove all
>>> warns from reset stubs, because NULL reset is valid, but these warns are
>>> there for reason - contradiction.
>>
>> You are right, I have to let go of those, too.
> 
> 
> Until fixed, I have dropped the three changes from my next branch
> related to this. Please re-post when fixed.

I missed this patch. If resend the patch, i will check.

Best Regards,
Jaehoon Chung

> 
> Kind regards
> Uffe
> 
>>
>> regards
>> Philipp
>>
> 
> 
>