linux-kernel - [PATCH] rpi_touchscreen_probe: check for failure case

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Message-Id: <20190724025644.17163-1-navid.emamdoost@gmail.com>
Date:   Tue, 23 Jul 2019 21:56:43 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     emamd001@....edu
Cc:     kjlu@....edu, smccaman@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] rpi_touchscreen_probe: check for failure case

of_graph_get_next_endpoint may return NULL, so null check is needed.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
index 28c0620dfe0f..2e0977e26fab 100644
--- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
+++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
@@ -399,6 +399,8 @@ static int rpi_touchscreen_probe(struct i2c_client *i2c,
 
 	/* Look up the DSI host.  It needs to probe before we do. */
 	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
+	if (!endpoint)
+		return -ENODEV;
 	dsi_host_node = of_graph_get_remote_port_parent(endpoint);
 	host = of_find_mipi_dsi_host_by_node(dsi_host_node);
 	of_node_put(dsi_host_node);
-- 
2.17.1