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

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Date: Wed, 24 Apr 2024 18:17:31 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Hans Verkuil <hverkuil@...all.nl>
Cc: Ricardo Ribalda <ribalda@...omium.org>,
	Martin Tuma <martin.tuma@...iteqautomotive.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
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	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
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	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
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Subject: Re: [PATCH v2 09/26] media: v4l: async: refactor
 v4l2_async_create_ancillary_links

Hi Hans,

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.

-- 
Regards,

Sakari Ailus