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Subject[PATCH 1/3] drm/bridge: make drm_panel_bridge_remove more robust
Date
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@linaro.org>
---
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
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