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[PATCH 4.4 216/342] drm: fix missing reference counting decrease

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  [PATCH 4.4 216/342] drm: fix missing reference counting decrease Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-03-02 01:40 +0100

#1347297 — [PATCH 4.4 216/342] drm: fix missing reference counting decrease

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Insu Yun <wuninsu@gmail.com>

commit dabe19540af9e563d526113bb102e1b9b9fa73f9 upstream.

In drm_dp_mst_allocate_vcpi, it returns true in two paths,
but in one path, there is no reference couting decrease.

Signed-off-by: Insu Yun <wuninsu@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/drm_dp_mst_topology.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2463,6 +2463,7 @@ bool drm_dp_mst_allocate_vcpi(struct drm
 		DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
 		if (pbn == port->vcpi.pbn) {
 			*slots = port->vcpi.num_slots;
+			drm_dp_put_port(port);
 			return true;
 		}
 	}

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