ASoC: samsung: arndale: Add missing OF node dereferencing

Ensure there is no OF node references kept when the driver
is removed/unbound.

Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20190920130218.32690-3-s.nawrocki@samsung.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 30 insertions, 4 deletions

diff --git a/sound/soc/samsung/arndale_rt5631.c b/sound/soc/samsung/arndale_rt5631.c
index c213913eb984..fd8c6642fb0d 100644
--- a/sound/soc/samsung/arndale_rt5631.c
+++ b/sound/soc/samsung/arndale_rt5631.c
@@ -5,6 +5,7 @@
 //  Author: Claude <claude@insginal.co.kr>
 
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 
@@ -74,6 +75,17 @@ static struct snd_soc_card arndale_rt5631 = {
         .num_links = ARRAY_SIZE(arndale_rt5631_dai),
 };
 
+static void arndale_put_of_nodes(struct snd_soc_card *card)
+{
+        struct snd_soc_dai_link *dai_link;
+        int i;
+
+        for_each_card_prelinks(card, i, dai_link) {
+                of_node_put(dai_link->cpus->of_node);
+                of_node_put(dai_link->codecs->of_node);
+        }
+}
+
 static int arndale_audio_probe(struct platform_device *pdev)
 {
         int n, ret;
@@ -103,18 +115,31 @@ static int arndale_audio_probe(struct platform_device *pdev)
                 if (!arndale_rt5631_dai[0].codecs->of_node) {
                         dev_err(&pdev->dev,
                         "Property 'samsung,audio-codec' missing or invalid\n");
-                        return -EINVAL;
+                        ret = -EINVAL;
+                        goto err_put_of_nodes;
                 }
         }
 
         ret = devm_snd_soc_register_card(card->dev, card);
+        if (ret) {
+                dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
+                goto err_put_of_nodes;
+        }
+        return 0;
 
-        if (ret)
-                dev_err(&pdev->dev, "snd_soc_register_card() failed:%d\n", ret);
-
+err_put_of_nodes:
+        arndale_put_of_nodes(card);
         return ret;
 }
 
+static int arndale_audio_remove(struct platform_device *pdev)
+{
+        struct snd_soc_card *card = platform_get_drvdata(pdev);
+
+        arndale_put_of_nodes(card);
+        return 0;
+}
+
 static const struct of_device_id samsung_arndale_rt5631_of_match[] __maybe_unused = {
         { .compatible = "samsung,arndale-rt5631", },
         { .compatible = "samsung,arndale-alc5631", },
@@ -129,6 +154,7 @@ static struct platform_driver arndale_audio_driver = {
                 .of_match_table = of_match_ptr(samsung_arndale_rt5631_of_match),
         },
         .probe = arndale_audio_probe,
+        .remove = arndale_audio_remove,
 };
 
 module_platform_driver(arndale_audio_driver);