ASoC: Add snd_soc_of_put_dai_link_codecs() helper function

The code for dereferencing device nodes in the 'codecs' array is moved
to a separate function so we can avoid open coding that in drivers.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc.h

@@ -1807,6 +1807,7 @@ int snd_soc_of_get_dai_name(struct device_node *of_node,
 int snd_soc_of_get_dai_link_codecs(struct device *dev,
 				   struct device_node *of_node,
 				   struct snd_soc_dai_link *dai_link);
+void snd_soc_of_put_dai_link_codecs(struct snd_soc_dai_link *dai_link);
 
 int snd_soc_add_dai_link(struct snd_soc_card *card,
 				struct snd_soc_dai_link *dai_link);

sound/soc/soc-core.c

@@ -4397,6 +4397,26 @@ int snd_soc_of_get_dai_name(struct device_node *of_node,
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_name);
 
+/*
+ * snd_soc_of_put_dai_link_codecs - Dereference device nodes in the codecs array
+ * @dai_link: DAI link
+ *
+ * Dereference device nodes acquired by snd_soc_of_get_dai_link_codecs().
+ */
+void snd_soc_of_put_dai_link_codecs(struct snd_soc_dai_link *dai_link)
+{
+	struct snd_soc_dai_link_component *component = dai_link->codecs;
+	int index;
+
+	for (index = 0; index < dai_link->num_codecs; index++, component++) {
+		if (!component->of_node)
+			break;
+		of_node_put(component->of_node);
+		component->of_node = NULL;
+	}
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_put_dai_link_codecs);
+
 /*
  * snd_soc_of_get_dai_link_codecs - Parse a list of CODECs in the devicetree
  * @dev: Card device
@@ -4406,7 +4426,8 @@ EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_name);
  * Builds an array of CODEC DAI components from the DAI link property
  * 'sound-dai'.
  * The array is set in the DAI link and the number of DAIs is set accordingly.
- * The device nodes in the array (of_node) must be dereferenced by the caller.
+ * The device nodes in the array (of_node) must be dereferenced by calling
+ * snd_soc_of_put_dai_link_codecs() on @dai_link.
  *
  * Returns 0 for success
  */
@@ -4454,14 +4475,7 @@ int snd_soc_of_get_dai_link_codecs(struct device *dev,
 	}
 	return 0;
 err:
-	for (index = 0, component = dai_link->codecs;
-	     index < dai_link->num_codecs;
-	     index++, component++) {
-		if (!component->of_node)
-			break;
-		of_node_put(component->of_node);
-		component->of_node = NULL;
-	}
+	snd_soc_of_put_dai_link_codecs(dai_link);
 	dai_link->codecs = NULL;
 	dai_link->num_codecs = 0;
 	return ret;