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drm/panel: check failure cases in the probe func

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The following function calls may fail and return NULL, so the null check
is added.
of_graph_get_next_endpoint
of_graph_get_remote_port_parent
of_graph_get_remote_port

Update: Thanks to Sam Ravnborg, for suggession on the use of goto to avoid
leaking endpoint.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190724195534.9303-1-navid.emamdoost@gmail.com
This commit is contained in:
Navid Emamdoost 2019-07-24 14:55:34 -05:00 committed by Sam Ravnborg
parent 67fe62dcf7
commit afd6d4f5a5
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
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@ -399,7 +399,13 @@ 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);
if (!dsi_host_node)
goto error;
host = of_find_mipi_dsi_host_by_node(dsi_host_node);
of_node_put(dsi_host_node);
if (!host) {
@ -408,6 +414,9 @@ static int rpi_touchscreen_probe(struct i2c_client *i2c,
}
info.node = of_graph_get_remote_port(endpoint);
if (!info.node)
goto error;
of_node_put(endpoint);
ts->dsi = mipi_dsi_device_register_full(host, &info);
@ -428,6 +437,10 @@ static int rpi_touchscreen_probe(struct i2c_client *i2c,
return ret;
return 0;
error:
of_node_put(endpoint);
return -ENODEV;
}
static int rpi_touchscreen_remove(struct i2c_client *i2c)