[PATCH 4.14 043/146] ASoC: twl4030: fix child-node lookup

Greg Kroah-Hartman
2018-01-01T15:06:49Z

From: Johan Hovold <johan@kernel.org>

commit 15f8c5f2415bfac73f33a14bcd83422bcbfb5298 upstream.

Fix child-node lookup during probe, which ended up searching the whole
device tree depth-first starting at the parent rather than just matching
on its children.

To make things worse, the parent codec node was also prematurely freed,
while the child node was leaked.

Fixes: 2d6d649a2e0f ("ASoC: twl4030: Support for DT booted kernel")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
sound/soc/codecs/twl4030.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -232,7 +232,7 @@ static struct twl4030_codec_data *twl403
struct twl4030_codec_data *pdata = dev_get_platdata(codec->dev);
struct device_node *twl4030_codec_node = NULL;

- twl4030_codec_node = of_find_node_by_name(codec->dev->parent->of_node,
+ twl4030_codec_node = of_get_child_by_name(codec->dev->parent->of_node,
"codec");

if (!pdata && twl4030_codec_node) {
@@ -241,9 +241,11 @@ static struct twl4030_codec_data *twl403
GFP_KERNEL);
if (!pdata) {
dev_err(codec->dev, "Can not allocate memory\n");
+ of_node_put(twl4030_codec_node);
return NULL;
}
twl4030_setup_pdata_of(pdata, twl4030_codec_node);
+ of_node_put(twl4030_codec_node);
}

return pdata;