From: Dave Airlie
The backtrace below shows that while we tear down a branch device,
when we remove the connector, we can attempt to disable MST on the
port we are tearing down, since the port is going away, there it
has a refcount of 0 already, so the validated ref lookup is trying
to kref_get a
On Mon, Nov 10, 2014 at 7:41 AM, Dave Airlie wrote:
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
> b/drivers/gpu/drm/drm_dp_mst_topology.c
> index ce1113c..f703a5b 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -882,8 +882,10 @@ sta
