linux-kernel - [PATCH 2/2] drm/bridge: samsung-dsim: use drm_bridge_clear_and

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Message-Id: <20260206-drm-bridge-atomic-vs-remove-clear_and_put-v1-2-6f1a7d03c45f@bootlin.com>
Date: Fri, 06 Feb 2026 15:27:56 +0100
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: 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>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Inki Dae <inki.dae@...sung.com>, Jagan Teki <jagan@...rulasolutions.com>, 
 Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Hui Pu <Hui.Pu@...ealthcare.com>, Ian Ray <ian.ray@...ealthcare.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>
Subject: [PATCH 2/2] drm/bridge: samsung-dsim: use
 drm_bridge_clear_and_put() to put the next bridge

drm_bridge_clear_and_put() is simpler to write and it prevents any
potential future use-after-free.

Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
---
 drivers/gpu/drm/bridge/samsung-dsim.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index 1d85e706c74b..568fc0f5b416 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -1980,8 +1980,7 @@ static int samsung_dsim_host_attach(struct mipi_dsi_host *host,
 	return 0;
 
 err_release_next_bridge:
-	drm_bridge_put(dsi->bridge.next_bridge);
-	dsi->bridge.next_bridge = NULL;
+	drm_bridge_clear_and_put(&dsi->bridge.next_bridge);
 	return ret;
 }
 
@@ -2002,8 +2001,7 @@ static int samsung_dsim_host_detach(struct mipi_dsi_host *host,
 	if (pdata->host_ops && pdata->host_ops->detach)
 		pdata->host_ops->detach(dsi, device);
 
-	drm_bridge_put(dsi->bridge.next_bridge);
-	dsi->bridge.next_bridge = NULL;
+	drm_bridge_clear_and_put(&dsi->bridge.next_bridge);
 
 	samsung_dsim_unregister_te_irq(dsi);
 

-- 
2.52.0