linux-kernel - [PATCH v7 4/5] drm/bridge: panel: drm_panel_bridge_remove: warn when called on non-panel bridge

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Message-Id: <20250214-drm-assorted-cleanups-v7-4-88ca5827d7af@bootlin.com>
Date: Fri, 14 Feb 2025 13:57:43 +0100
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 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>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>
Subject: [PATCH v7 4/5] drm/bridge: panel: drm_panel_bridge_remove: warn
 when called on non-panel bridge

This function is for panel_bridge instances only. The silent return when
invoked on other bridges might hide actual errors, so avoid them to go
unnoticed.

Reviewed-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
---

Changes in v7: none

This patch was added in v6.
---
 drivers/gpu/drm/bridge/panel.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 0c5db13b11dcb90ee88b9932b91aa05fc48d59bd..c57036b06493a6922e2cae38bcd1733930ff0073 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -322,8 +322,10 @@ void drm_panel_bridge_remove(struct drm_bridge *bridge)
 	if (!bridge)
 		return;
 
-	if (!drm_bridge_is_panel(bridge))
+	if (!drm_bridge_is_panel(bridge)) {
+		drm_warn(bridge->dev, "%s: called on non-panel bridge!\n", __func__);
 		return;
+	}
 
 	panel_bridge = drm_bridge_to_panel_bridge(bridge);
 

-- 
2.48.1