linux-kernel - Re: [PATCH V2] drm/vkms: Remove useless call to drm_connector

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CADKXj+4ixRrfZC9FRShEf7=L__0qk-uYNXvtwCs_tuUhgrQhEQ@mail.gmail.com>
Date:   Sun, 19 May 2019 21:58:17 -0300
From:   Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
To:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        Haneen Mohammed <hamohammed.sa@...il.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] drm/vkms: Remove useless call to drm_connector_register/unregister()

Hi Daniel,

I forgot to apply this patch. Is it ok for you if I apply it?


On Fri, Mar 15, 2019 at 1:11 PM Rodrigo Siqueira
<rodrigosiqueiramelo@...il.com> 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; the same
> issue exists with drm_connector_unregister(). Therefore, this commit
> removes the unnecessary call to drm_connector_register() and
> drm_connector_unregister().
>
> Changes since v2:
> * Remove unnecessary call to drm_connector_unregister()
> * Remove unused label
>
> Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
> Reviewed-by: Daniel Vetter <daniel@...ll.ch>
> ---
>  drivers/gpu/drm/vkms/vkms_output.c | 10 ----------
>  1 file changed, 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
> index 3b162b25312e..56fb5c2a2315 100644
> --- a/drivers/gpu/drm/vkms/vkms_output.c
> +++ b/drivers/gpu/drm/vkms/vkms_output.c
> @@ -6,7 +6,6 @@
>
>  static void vkms_connector_destroy(struct drm_connector *connector)
>  {
> -       drm_connector_unregister(connector);
>         drm_connector_cleanup(connector);
>  }
>
> @@ -71,12 +70,6 @@ int vkms_output_init(struct vkms_device *vkmsdev)
>
>         drm_connector_helper_add(connector, &vkms_conn_helper_funcs);
>
> -       ret = drm_connector_register(connector);
> -       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) {
> @@ -99,9 +92,6 @@ int vkms_output_init(struct vkms_device *vkmsdev)
>         drm_encoder_cleanup(encoder);
>
>  err_encoder:
> -       drm_connector_unregister(connector);
> -
> -err_connector_register:
>         drm_connector_cleanup(connector);
>
>  err_connector:
> --
> 2.21.0



-- 

Rodrigo Siqueira
https://siqueira.tech