[PATCH v5 05/11] drm: bridge: allow some funcs to be optional

[Chris Zhong]

Check the validity of post_disable/pre_enable in bridge->funcs before
call them.

Signed-off-by: Chris Zhong <zyw at rock-chips.com>
---

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

 drivers/gpu/drm/drm_bridge.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 6b8f721..8f29330 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -223,7 +223,8 @@ void drm_bridge_post_disable(struct drm_bridge *bridge)
 	if (!bridge)
 		return;
 
-	bridge->funcs->post_disable(bridge);
+	if (bridge->funcs->post_disable)
+		bridge->funcs->post_disable(bridge);
 
 	drm_bridge_post_disable(bridge->next);
 }
@@ -273,7 +274,8 @@ void drm_bridge_pre_enable(struct drm_bridge *bridge)
 
 	drm_bridge_pre_enable(bridge->next);
 
-	bridge->funcs->pre_enable(bridge);
+	if (bridge->funcs->pre_enable)
+		bridge->funcs->pre_enable(bridge);
 }
 EXPORT_SYMBOL(drm_bridge_pre_enable);
 
-- 
2.6.3