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Message-ID: <40b9c015-8ccf-4313-800a-ecae9aa8cc27@xs4all.nl>
Date: Wed, 24 Apr 2024 12:55:20 +0200
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Subject: Re: [PATCH v2 09/26] media: v4l: async: refactor
 v4l2_async_create_ancillary_links
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To: Ricardo Ribalda <ribalda@chromium.org>,
 Martin Tuma <martin.tuma@digiteqautomotive.com>,
 Mauro Carvalho Chehab <mchehab@kernel.org>,
 Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
 Hugues Fruchet <hugues.fruchet@foss.st.com>,
 Alain Volmat <alain.volmat@foss.st.com>,
 Maxime Coquelin <mcoquelin.stm32@gmail.com>,
 Alexandre Torgue <alexandre.torgue@foss.st.com>,
 Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Chen-Yu Tsai
 <wens@csie.org>, Jernej Skrabec <jernej.skrabec@gmail.com>,
 Samuel Holland <samuel@sholland.org>,
 Sakari Ailus <sakari.ailus@linux.intel.com>,
 Thierry Reding <thierry.reding@gmail.com>,
 Jonathan Hunter <jonathanh@nvidia.com>,
 Sowjanya Komatineni <skomatineni@nvidia.com>,
 Luca Ceresoli <luca.ceresoli@bootlin.com>,
 Matthias Brugger <matthias.bgg@gmail.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>,
 Sergey Kozlov <serjk@netup.ru>, Abylay Ospan <aospan@netup.ru>,
 Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>,
 Dmitry Osipenko <digetx@gmail.com>,
 Benjamin Mugnier <benjamin.mugnier@foss.st.com>,
 Sylvain Petinot <sylvain.petinot@foss.st.com>,
 Stanimir Varbanov <stanimir.k.varbanov@gmail.com>,
 Vikash Garodia <quic_vgarodia@quicinc.com>,
 Bryan O'Donoghue <bryan.odonoghue@linaro.org>,
 Bjorn Andersson <andersson@kernel.org>,
 Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
 linux-stm32@st-md-mailman.stormreply.com,
 linux-arm-kernel@lists.infradead.org, linux-staging@lists.linux.dev,
 linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org,
 linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org
References: <20240419-fix-cocci-v2-0-2119e692309c@chromium.org>
 <20240419-fix-cocci-v2-9-2119e692309c@chromium.org>
From: Hans Verkuil <hverkuil@xs4all.nl>
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In-Reply-To: <20240419-fix-cocci-v2-9-2119e692309c@chromium.org>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

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@chromium.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
}

Regards,

	Hans