[PATCH v2 02/10] ASoC: samsung: arndale: Add missing OF node dereferencing

Sylwester Nawrocki
2019-09-20T13:03:34Z

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>
---
Changes since v1:
- rebased to beginning of the series
---
sound/soc/samsung/arndale_rt5631.c | 34 ++++++++++++++++++++++++++----
1 file 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);
--
2.17.1