linux-kernel - Re: [PATCH] drm/vkms: Remove useless call to drm_connector

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Date:   Mon, 11 Mar 2019 15:00:04 -0300
From:   Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
To:     David Airlie <airlied@...ux.ie>,
        Haneen Mohammed <hamohammed.sa@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/vkms: Remove useless call to drm_connector_register()

On 03/11, Daniel Vetter wrote:
> On Sun, Mar 10, 2019 at 06:22:41PM -0300, Rodrigo Siqueira wrote:
> > The function vkms_output_init() is invoked during the module
> > initialization, and it handles the creation/configuration of the vkms
> > essential elements (e.g., connectors, encoder, etc). Among the
> > initializations, this function tries to initialize a connector and
> > register it by calling drm_connector_register(). However, inside the
> > drm_connector_register(), at the beginning of this function there is the
> > following validation:
> > 
> >  if (!connector->dev->registered)
> >    return 0;
> > 
> > In this sense, invoke drm_connector_register() after initializing the
> > connector has no effect because the register field is false. The
> > connector register happens when drm_dev_register() is invoked.
> > Therefore, this commit removes the drm_connector_register() from
> > vkms_output_init().
> > 
> > Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
> > ---
> >  drivers/gpu/drm/vkms/vkms_output.c | 6 ------
> >  1 file changed, 6 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
> > index 3b162b25312e..a6cee4c279c2 100644
> > --- a/drivers/gpu/drm/vkms/vkms_output.c
> > +++ b/drivers/gpu/drm/vkms/vkms_output.c
> > @@ -71,12 +71,6 @@ int vkms_output_init(struct vkms_device *vkmsdev)
> >  
> >  	drm_connector_helper_add(connector, &vkms_conn_helper_funcs);
> >  
> > -	ret = drm_connector_register(connector);
> 
> Yeah that's only needed for connectors added when hotplugging at runtime,
> not for connectors which are created at driver load time.
> 
> Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
> 
> btw same issue exists with the drm_connector_unregister, that's also not
> needed.

Thanks for your review :)

Should I send a V2 that also removes the drm_connector_unregister()? Or
should I send it in a separated patch?

Best Regards

> -Daniel
> 
> > -	if (ret) {
> > -		DRM_ERROR("Failed to register connector\n");
> > -		goto err_connector_register;
> > -	}
> > -
> >  	ret = drm_encoder_init(dev, encoder, &vkms_encoder_funcs,
> >  			       DRM_MODE_ENCODER_VIRTUAL, NULL);
> >  	if (ret) {
> > -- 
> > 2.21.0
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

-- 
Rodrigo Siqueira
https://siqueira.tech
Graduate Student
Department of Computer Science
University of São Paulo

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