drm: sun4i: fix probe error handling

gcc points out a possible uninitialized variable use in
sun4i_dclk_create():

drivers/gpu/drm/sun4i/sun4i_dotclock.c: In function 'sun4i_dclk_create':
drivers/gpu/drm/sun4i/sun4i_dotclock.c:139:12: error: 'clk_name' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  init.name = clk_name;

The warning only shows up when CONFIG_OF is disabled, and the
property is never filled, but the same bug can show up even
when CONFIG_OF is enabled but of_property_read_string_index
returns another error.

To fix it, this ensures that sun4i_dclk_create propagates
any error from of_property_read_string_index.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 9026e0d122ac ("drm: Add Allwinner A10 Display Engine support")
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/drivers/gpu/drm/sun4i/sun4i_dotclock.c b/drivers/gpu/drm/sun4i/sun4i_dotclock.c
index 3ff668c..6c9c090 100644 (file)
--- a/drivers/gpu/drm/sun4i/sun4i_dotclock.c
+++ b/drivers/gpu/drm/sun4i/sun4i_dotclock.c
@@ -127,10 +127,14 @@ int sun4i_dclk_create(struct device *dev, struct sun4i_tcon *tcon)
        const char *clk_name, *parent_name;
        struct clk_init_data init;
        struct sun4i_dclk *dclk;
+       int ret;
 
        parent_name = __clk_get_name(tcon->sclk0);
-       of_property_read_string_index(dev->of_node, "clock-output-names", 0,
-                                     &clk_name);
+       ret = of_property_read_string_index(dev->of_node,
+                                           "clock-output-names", 0,
+                                           &clk_name);
+       if (ret)
+               return ret;
 
        dclk = devm_kzalloc(dev, sizeof(*dclk), GFP_KERNEL);
        if (!dclk)