[PATCH v1] drm/amd/dc: Fix a missing check bug in dm_dp_mst_detect()

[Alex Deucher]

Applied.  Thanks!

Alex

On Thu, Apr 8, 2021 at 9:01 PM <wangyingjie55 at 126.com> wrote:
>
> From: Yingjie Wang <wangyingjie55 at 126.com>
>
> In dm_dp_mst_detect(), We should check whether or not @connector
> has been unregistered from userspace. If the connector is unregistered,
> we should return disconnected status.
>
> Fixes: 4562236b3bc0 ("drm/amd/dc: Add dc display driver (v2)")
> Signed-off-by: Yingjie Wang <wangyingjie55 at 126.com>
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> index 8ab0b9060d2b..103dfd0e9b65 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> @@ -271,6 +271,9 @@ dm_dp_mst_detect(struct drm_connector *connector,
>         struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
>         struct amdgpu_dm_connector *master = aconnector->mst_port;
>
> +       if (drm_connector_is_unregistered(connector))
> +               return connector_status_disconnected;
> +
>         return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,
>                                       aconnector->port);
>  }
> --
> 2.7.4
>
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