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drm/radeon: Fix a missing check bug in radeon_dp_mst_detect()
[ Upstream commit 25315eb ] 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: 9843ead ("drm/radeon: add DisplayPort MST support (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>
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