[PATCH] ASoc: audio-graph-card2: Fix refcount leak bug in __graph_get_type()

[Liang He]

We should call of_node_put() for the reference before its replacement
as it returned by of_get_parent() which has increased the refcount.
Besides, we should also call of_node_put() before return.

Fixes: c8c74939f791 ("ASoC: audio-graph-card2: add Multi CPU/Codec support")
Signed-off-by: Liang He <windhl at 126.com>
---
 sound/soc/generic/audio-graph-card2.c | 35 +++++++++++++++++++--------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/sound/soc/generic/audio-graph-card2.c b/sound/soc/generic/audio-graph-card2.c
index 77ac4051b827..4f6bae73bd5e 100644
--- a/sound/soc/generic/audio-graph-card2.c
+++ b/sound/soc/generic/audio-graph-card2.c
@@ -229,7 +229,8 @@ enum graph_type {
 
 static enum graph_type __graph_get_type(struct device_node *lnk)
 {
-	struct device_node *np;
+	struct device_node *np, *parent_np;
+	enum graph_type ret;
 
 	/*
 	 * target {
@@ -240,19 +241,33 @@ static enum graph_type __graph_get_type(struct device_node *lnk)
 	 * };
 	 */
 	np = of_get_parent(lnk);
-	if (of_node_name_eq(np, "ports"))
-		np = of_get_parent(np);
+	if (of_node_name_eq(np, "ports")) {
+		parent_np = of_get_parent(np);
+		of_node_put(np);
+		np = parent_np;
+	}
 
-	if (of_node_name_eq(np, GRAPH_NODENAME_MULTI))
-		return GRAPH_MULTI;
+	if (of_node_name_eq(np, GRAPH_NODENAME_MULTI)) {
+		ret = GRAPH_MULTI;
+		goto out_put;
+	}
 
-	if (of_node_name_eq(np, GRAPH_NODENAME_DPCM))
-		return GRAPH_DPCM;
+	if (of_node_name_eq(np, GRAPH_NODENAME_DPCM)) {
+		ret = GRAPH_DPCM;
+		goto out_put;
+	}
 
-	if (of_node_name_eq(np, GRAPH_NODENAME_C2C))
-		return GRAPH_C2C;
+	if (of_node_name_eq(np, GRAPH_NODENAME_C2C)) {
+		ret = GRAPH_C2C;
+		goto out_put;
+	}
+
+	ret = GRAPH_NORMAL;
+
+out_put:
+	of_node_put(np);
+	return ret;
 
-	return GRAPH_NORMAL;
 }
 
 static enum graph_type graph_get_type(struct asoc_simple_priv *priv,
-- 
2.25.1