linux-kernel - [PATCH v3 13/22] drm/bridge: imx8qxp-pxl2dpi: simplify put of device

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Message-Id: <20251216-drm-bridge-alloc-getput-drm_of_find_bridge-v3-13-b5165fab8058@bootlin.com>
Date: Tue, 16 Dec 2025 18:58:46 +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>, 
 Jonathan Corbet <corbet@....net>, Alexey Brodkin <abrodkin@...opsys.com>, 
 Phong LE <ple@...libre.com>, Liu Ying <victor.liu@....com>, 
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Kevin Hilman <khilman@...libre.com>, 
 Jerome Brunet <jbrunet@...libre.com>, 
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: Hui Pu <Hui.Pu@...ealthcare.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-amlogic@...ts.infradead.org, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>
Subject: [PATCH v3 13/22] drm/bridge: imx8qxp-pxl2dpi: simplify put of
 device_node pointers

Simplify the error-management code in
imx8qxp_pxl2dpi_get_available_ep_from_port() by using a release action for
the struct device_node pointers.

Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
---
 drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
index 111310acab2c..a4941f39a2e6 100644
--- a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
+++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
@@ -258,35 +258,28 @@ imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,
 static struct drm_bridge *
 imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)
 {
-	struct device_node *ep, *remote;
 	struct drm_bridge *next_bridge;
 	int ret;
 
-	ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);
+	struct device_node *ep __free(device_node) =
+		imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);
 	if (IS_ERR(ep)) {
 		ret = PTR_ERR(ep);
 		return ERR_PTR(ret);
 	}
 
-	remote = of_graph_get_remote_port_parent(ep);
+	struct device_node *remote __free(device_node) = of_graph_get_remote_port_parent(ep);
 	if (!remote || !of_device_is_available(remote)) {
 		DRM_DEV_ERROR(p2d->dev, "no available remote\n");
-		next_bridge = ERR_PTR(-ENODEV);
-		goto out;
+		return ERR_PTR(-ENODEV);
 	} else if (!of_device_is_available(remote->parent)) {
 		DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");
-		next_bridge = ERR_PTR(-ENODEV);
-		goto out;
+		return ERR_PTR(-ENODEV);
 	}
 
 	next_bridge = of_drm_find_bridge(remote);
-	if (!next_bridge) {
-		next_bridge = ERR_PTR(-EPROBE_DEFER);
-		goto out;
-	}
-out:
-	of_node_put(remote);
-	of_node_put(ep);
+	if (!next_bridge)
+		return ERR_PTR(-EPROBE_DEFER);
 
 	return next_bridge;
 }

-- 
2.52.0