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    Subject[PATCH 5.13 391/800] drm/amd/dc: Fix a missing check bug in dm_dp_mst_detect()
    Date
    From: Yingjie Wang <wangyingjie55@126.com>

    [ Upstream commit 655c0ed19772d92c9665ed08bdc5202acc096dda ]

    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@126.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    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 9b221db526dc..d62460b69d95 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
    @@ -278,6 +278,9 @@ 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);
    }
    --
    2.30.2


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