linux-kernel - [PATCH] drm/bridge: panel: Remove a redundant check on existence of bridge->encoder

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Date: Sat, 11 May 2024 22:03:16 +0800
From: Sui Jingfeng <sui.jingfeng@...ux.dev>
To: Maxime Ripard <mripard@...nel.org>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Sui Jingfeng <sui.jingfeng@...ux.dev>
Subject: [PATCH] drm/bridge: panel: Remove a redundant check on existence of bridge->encoder

In panel_bridge_attach(), the check on the existence of bridge->encoder
has already been done in the implementation of drm_bridge_attach(). And
it is done before the bridge->funcs->attach hook is called. Hence, it is
guaranteed that the .encoder member of the struct drm_bridge is not NULL
when the panel_bridge_attach() is called.

There is no need to check the existence of bridge->encoder another time
at the implementation layer, therefore remove the redundant checking codes
"if (!bridge->encoder) { ... }".

Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>
---
 drivers/gpu/drm/bridge/panel.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 7f41525f7a6e..762402dca6dd 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -65,11 +65,6 @@ static int panel_bridge_attach(struct drm_bridge *bridge,
 	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
 		return 0;
 
-	if (!bridge->encoder) {
-		DRM_ERROR("Missing encoder\n");
-		return -ENODEV;
-	}
-
 	drm_connector_helper_add(connector,
 				 &panel_bridge_connector_helper_funcs);
 
-- 
2.43.0