Re: [PATCH v3 05/17] media: rkisp1: params: Fix and simplify (un)registration

[Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>]

Hi Dafna,

On Tue, Mar 22, 2022 at 06:27:26AM +0200, Dafna Hirschfeld wrote:
> On 19.03.2022 18:30, Laurent Pinchart wrote:
> > The rkisp1_params_register() and rkisp1_params_unregister() functions
> > don't destroy the mutex (in the error path for the former). Fix this,
> > simplify error handling at registration time as media_entity_cleanup()
> > can be called on an uninitialized entity, and make
> > rkisp1_params_unregister() safe to be called on an unregistered params
> > node to prepare for simplification of error handling at probe time.
> > 
> > Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> > ---
> >  .../platform/rockchip/rkisp1/rkisp1-params.c      | 15 ++++++++++++---
> >  1 file changed, 12 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
> > index 8f62f09e635f..d41823c861ca 100644
> > --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
> > +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
> > @@ -1844,16 +1844,21 @@ int rkisp1_params_register(struct rkisp1_device *rkisp1)
> >  	node->pad.flags = MEDIA_PAD_FL_SOURCE;
> >  	ret = media_entity_pads_init(&vdev->entity, 1, &node->pad);
> >  	if (ret)
> > -		return ret;
> > +		goto error;
> > +
> >  	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
> >  	if (ret) {
> >  		dev_err(rkisp1->dev,
> >  			"failed to register %s, ret=%d\n", vdev->name, ret);
> > -		goto err_cleanup_media_entity;
> > +		goto error;
> >  	}
> > +
> >  	return 0;
> > -err_cleanup_media_entity:
> > +
> > +error:
> >  	media_entity_cleanup(&vdev->entity);
> > +	mutex_destroy(&node->vlock);
> > +	params->rkisp1 = NULL;
> >  	return ret;
> >  }
> >  
> > @@ -1863,6 +1868,10 @@ void rkisp1_params_unregister(struct rkisp1_device *rkisp1)
> >  	struct rkisp1_vdev_node *node = &params->vnode;
> >  	struct video_device *vdev = &node->vdev;
> >  
> > +	if (!params->rkisp1)
> > +		return;
> > +
> 
> For the capture devices, you did:
>        if (!video_is_registered(&cap->vnode.vdev))
>                return;
> Better be consistend and do the same here and for stats?

I'll do that.

> >  	vb2_video_unregister_device(vdev);
> >  	media_entity_cleanup(&vdev->entity);
> > +	mutex_destroy(&node->vlock);
> >  }

-- 
Regards,

Laurent Pinchart