ASoC: tegra: fix device_node refcounting

tegra_rt5677_probe() gets a couple of device nodes with of_parse_phandle(),
but there is no release of them.

The patch adds the release to tegra_rt5677_remove() and
to error handling paths in the probe.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <[email protected]>
Reviewed-by: Nicholas Mc Guire <[email protected]>
Signed-off-by: Mark Brown <[email protected]>

sound/soc/tegra/tegra_rt5677.c

@@ -264,13 +264,13 @@ static int tegra_rt5677_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev,
 			"Property 'nvidia,i2s-controller' missing or invalid\n");
 		ret = -EINVAL;
-		goto err;
+		goto err_put_codec_of_node;
 	}
 	tegra_rt5677_dai.platform_of_node = tegra_rt5677_dai.cpu_of_node;
 
 	ret = tegra_asoc_utils_init(&machine->util_data, &pdev->dev);
 	if (ret)
-		goto err;
+		goto err_put_cpu_of_node;
 
 	ret = snd_soc_register_card(card);
 	if (ret) {
@@ -283,6 +283,13 @@ static int tegra_rt5677_probe(struct platform_device *pdev)
 
 err_fini_utils:
 	tegra_asoc_utils_fini(&machine->util_data);
+err_put_cpu_of_node:
+	of_node_put(tegra_rt5677_dai.cpu_of_node);
+	tegra_rt5677_dai.cpu_of_node = NULL;
+	tegra_rt5677_dai.platform_of_node = NULL;
+err_put_codec_of_node:
+	of_node_put(tegra_rt5677_dai.codec_of_node);
+	tegra_rt5677_dai.codec_of_node = NULL;
 err:
 	return ret;
 }
@@ -296,6 +303,12 @@ static int tegra_rt5677_remove(struct platform_device *pdev)
 
 	tegra_asoc_utils_fini(&machine->util_data);
 
+	tegra_rt5677_dai.platform_of_node = NULL;
+	of_node_put(tegra_rt5677_dai.codec_of_node);
+	tegra_rt5677_dai.codec_of_node = NULL;
+	of_node_put(tegra_rt5677_dai.cpu_of_node);
+	tegra_rt5677_dai.cpu_of_node = NULL;
+
 	return 0;
 }