[PATCH v1] drm/radeon: Fix a missing check bug in radeon_dp_mst_detect()

[Alex Deucher]

Applied.  Thanks!

Alex

On Wed, Apr 7, 2021 at 2:23 AM <wangyingjie55 at 126.com> wrote:
>
> From: Yingjie Wang <wangyingjie55 at 126.com>
>
> In radeon_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: 9843ead08f18 ("drm/radeon: add DisplayPort MST support (v2)")
> Signed-off-by: Yingjie Wang <wangyingjie55 at 126.com>
> ---
>  drivers/gpu/drm/radeon/radeon_dp_mst.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c
> index 2c32186c4acd..4e4c937c36c6 100644
> --- a/drivers/gpu/drm/radeon/radeon_dp_mst.c
> +++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c
> @@ -242,6 +242,9 @@ radeon_dp_mst_detect(struct drm_connector *connector,
>                 to_radeon_connector(connector);
>         struct radeon_connector *master = radeon_connector->mst_port;
>
> +       if (drm_connector_is_unregistered(connector))
> +               return connector_status_disconnected;
> +
>         return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,
>                                       radeon_connector->port);
>  }
> --
> 2.7.4
>
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