[PATCH 1/3] drm/bridge: make drm_panel_bridge_remove more robust

[Benjamin Gaignard]

Make sure that bridge parameter is not NULL and can be safely
cast into a panel_bridge structure.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
---
 drivers/gpu/drm/bridge/panel.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index e0cca19..6d99d4a 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -188,7 +188,15 @@ EXPORT_SYMBOL(drm_panel_bridge_add);
  */
 void drm_panel_bridge_remove(struct drm_bridge *bridge)
 {
-	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct panel_bridge *panel_bridge;
+
+	if (!bridge)
+		return;
+
+	if (bridge->funcs != &panel_bridge_bridge_funcs)
+		return;
+
+	panel_bridge = drm_bridge_to_panel_bridge(bridge);
 
 	drm_bridge_remove(bridge);
 	devm_kfree(panel_bridge->panel->dev, bridge);
-- 
2.7.4