linux-kernel - Re: [PATCH v4 15/17] media: qcom: camss: Move vfe_disable into a common routine where applicable

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Message-ID: <be6b41e0-c610-49c3-ae6c-e811b56aca30@xs4all.nl>
Date:   Mon, 11 Sep 2023 11:10:47 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>, rfoss@...nel.org,
        todor.too@...il.com, agross@...nel.org, andersson@...nel.org,
        mchehab@...nel.org, laurent.pinchart@...asonboard.com,
        sakari.ailus@...ux.intel.com, andrey.konovalov@...aro.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 15/17] media: qcom: camss: Move vfe_disable into a
 common routine where applicable

On 08/09/2023 12:36, Bryan O'Donoghue wrote:
> On 08/09/2023 11:24, Konrad Dybcio wrote:
>> On 8.09.2023 12:21, Bryan O'Donoghue wrote:
>>> On 08/09/2023 11:04, Konrad Dybcio wrote:
>>>> On 8.09.2023 12:02, Konrad Dybcio wrote:
>>>>> On 7.09.2023 18:44, Bryan O'Donoghue wrote:
>>>>>> We can move vfe_disable() into a common routine in the core VFE file
>>>>>> provided we make wm_stop() a VFE specific callback.
>>>>>>
>>>>>> The callback is required to capture the case where VFE 17x currently isn't
>>>>>> VC enabled where as VFE 480 is.
>>>>>>
>>>>>> Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>>>>>> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>>>>>> ---
>>>>> Acked-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>>>>>
>>>>> Konrad
>>>> Actually there's
>>>>
>>>> ret = vfe_reset(vfe);
>>>>
>>>> return ret;
>>>>
>>>>
>>>> which could just be
>>>>
>>>> return vfe_reset(vfe);
>>>>
>>>>
>>>> Konrad
>>>
>>> On purpose.
>>>
>>> I prefer the ret = ; return ret; pattern since it makes it easier / less work to
>>>
>>> ret = fn();
>>> if (ret)
>>>      goto error;
>>>
>>> error:
>>>      return ret;
>> There's no error label in vfe_disable_output
>>
>> Konrad
> 
> No there is not. Its a pattern I use to make adding jump labels easier later on.

This adds a bunch of extra lines just in case something might happen in the
future. That is generally a bad idea, so please change this. As you can see
it just causes reviewers to trip over this with exactly the question you got
here.

> 
> Just like you use the pattern of appending "," to aggregate initialisation.

Adding a comma at the end doesn't add extra lines. To be honest, I don't
have a strong opinion on this either way. Personally I would probably use a
comma if it is likely that the list would be extended in the future, and
leave it out if I am pretty certain that won't happen. In any case, I don't
mind either way.

Regards,

	Hans

> 
> ---
> bod