linux-kernel - Re: [PATCH v2 09/26] media: v4l: async: refactor v4l2_async_create_ancillary

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Date: Sat, 4 May 2024 10:25:42 +0200
From: Hans Verkuil <hverkuil@...all.nl>
To: Ricardo Ribalda <ribalda@...omium.org>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>,
 Martin Tuma <martin.tuma@...iteqautomotive.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Hugues Fruchet <hugues.fruchet@...s.st.com>,
 Alain Volmat <alain.volmat@...s.st.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Chen-Yu Tsai
 <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Samuel Holland <samuel@...lland.org>,
 Thierry Reding <thierry.reding@...il.com>,
 Jonathan Hunter <jonathanh@...dia.com>,
 Sowjanya Komatineni <skomatineni@...dia.com>,
 Luca Ceresoli <luca.ceresoli@...tlin.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Sergey Kozlov <serjk@...up.ru>, Abylay Ospan <aospan@...up.ru>,
 Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
 Dmitry Osipenko <digetx@...il.com>,
 Benjamin Mugnier <benjamin.mugnier@...s.st.com>,
 Sylvain Petinot <sylvain.petinot@...s.st.com>,
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
 Vikash Garodia <quic_vgarodia@...cinc.com>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, linux-media@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-staging@...ts.linux.dev,
 linux-sunxi@...ts.linux.dev, linux-tegra@...r.kernel.org,
 linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 09/26] media: v4l: async: refactor
 v4l2_async_create_ancillary_links

On 29/04/2024 12:51, Ricardo Ribalda wrote:
> Hi Hans
> 
> Your proposal is what I sent for v1:
> https://lore.kernel.org/linux-media/20240415-fix-cocci-v1-9-477afb23728b@chromium.org/

I decided to go for the v1. I prefer it, and more importantly, Sakari as
maintainer of this code prefers it as well.

Regards,

	Hans

> 
> I have no strong opinion for any of the two, please feel free to land
> whatever version you prefer.
> 
> 
> Regards
> 
> On Wed, 24 Apr 2024 at 20:46, Laurent Pinchart
> <laurent.pinchart@...asonboard.com> wrote:
>>
>> On Wed, Apr 24, 2024 at 06:17:31PM +0000, Sakari Ailus wrote:
>>> On Wed, Apr 24, 2024 at 12:55:20PM +0200, Hans Verkuil wrote:
>>>> On 19/04/2024 11:47, Ricardo Ribalda wrote:
>>>>> Return 0 without checking IS_ERR or PTR_ERR if CONFIG_MEDIA_CONTROLLER
>>>>> is not enabled.
>>>>>
>>>>> This makes cocci happier:
>>>>>
>>>>> drivers/media/v4l2-core/v4l2-async.c:331:23-30: ERROR: PTR_ERR applied after initialization to constant on line 319
>>>>>
>>>>> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
>>>>> ---
>>>>>  drivers/media/v4l2-core/v4l2-async.c | 7 +++----
>>>>>  1 file changed, 3 insertions(+), 4 deletions(-)
>>>>>
>>>>> diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
>>>>> index 4bb073587817..915a9f3ea93c 100644
>>>>> --- a/drivers/media/v4l2-core/v4l2-async.c
>>>>> +++ b/drivers/media/v4l2-core/v4l2-async.c
>>>>> @@ -316,9 +316,10 @@ v4l2_async_nf_try_all_subdevs(struct v4l2_async_notifier *notifier);
>>>>>  static int v4l2_async_create_ancillary_links(struct v4l2_async_notifier *n,
>>>>>                                        struct v4l2_subdev *sd)
>>>>>  {
>>>>> - struct media_link *link = NULL;
>>>>> + struct media_link *link;
>>>>>
>>>>> -#if IS_ENABLED(CONFIG_MEDIA_CONTROLLER)
>>>>> + if (!IS_ENABLED(CONFIG_MEDIA_CONTROLLER))
>>>>> +         return 0;
>>>>>
>>>>>   if (sd->entity.function != MEDIA_ENT_F_LENS &&
>>>>>       sd->entity.function != MEDIA_ENT_F_FLASH)
>>>>> @@ -326,8 +327,6 @@ static int v4l2_async_create_ancillary_links(struct v4l2_async_notifier *n,
>>>>>
>>>>>   link = media_create_ancillary_link(&n->sd->entity, &sd->entity);
>>>>>
>>>>> -#endif
>>>>> -
>>>>>   return IS_ERR(link) ? PTR_ERR(link) : 0;
>>>>>  }
>>>>
>>>> I think I would prefer:
>>>>
>>>> static int v4l2_async_create_ancillary_links(struct v4l2_async_notifier *n,
>>>>                                          struct v4l2_subdev *sd)
>>>> {
>>>> #if IS_ENABLED(CONFIG_MEDIA_CONTROLLER)
>>>>     struct media_link *link;
>>>>
>>>>     ...
>>>>
>>>>     return IS_ERR(link) ? PTR_ERR(link) : 0;
>>>> #else
>>>>     return 0;
>>>> #endif
>>>> }
>>>>
>>>
>>> Me, too.
>>
>> I actually prefer Ricardo's proposal :-)
>>
>> --
>> Regards,
>>
>> Laurent Pinchart
> 
> 
>