linux-kernel - [RFT 2/2] ASoC: samsung: Add proper error paths to s3c24xx I2S driver

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Date:   Wed, 26 Jul 2017 20:57:29 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Sangbeom Kim <sbkim73@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Cc:     Arvind Yadav <arvind.yadav.cs@...il.com>
Subject: [RFT 2/2] ASoC: samsung: Add proper error paths to s3c24xx I2S driver

s3c2412_i2s_probe() might fail so driver has to revert work done by
s3c_i2sv2_probe() (clock enabling).  Missing doing this would lead to
clock enable in-balance.

Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

---

Please, kindly test on S3C24xx hardware.
---
 sound/soc/samsung/s3c-i2s-v2.c  |  9 +++++++++
 sound/soc/samsung/s3c-i2s-v2.h  |  7 +++++++
 sound/soc/samsung/s3c2412-i2s.c | 11 +++++++++--
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/sound/soc/samsung/s3c-i2s-v2.c b/sound/soc/samsung/s3c-i2s-v2.c
index 9b28046eea8e..df83f2730a53 100644
--- a/sound/soc/samsung/s3c-i2s-v2.c
+++ b/sound/soc/samsung/s3c-i2s-v2.c
@@ -651,6 +651,15 @@ int s3c_i2sv2_probe(struct snd_soc_dai *dai,
 }
 EXPORT_SYMBOL_GPL(s3c_i2sv2_probe);
 
+void s3c_i2sv2_cleanup(struct snd_soc_dai *dai,
+		      struct s3c_i2sv2_info *i2s)
+{
+	clk_disable(i2s->iis_pclk);
+	clk_put(i2s->iis_pclk);
+	i2s->iis_pclk = NULL;
+}
+EXPORT_SYMBOL_GPL(s3c_i2sv2_cleanup);
+
 #ifdef CONFIG_PM
 static int s3c2412_i2s_suspend(struct snd_soc_dai *dai)
 {
diff --git a/sound/soc/samsung/s3c-i2s-v2.h b/sound/soc/samsung/s3c-i2s-v2.h
index 182d80564e37..3fca20f7a853 100644
--- a/sound/soc/samsung/s3c-i2s-v2.h
+++ b/sound/soc/samsung/s3c-i2s-v2.h
@@ -92,6 +92,13 @@ extern int s3c_i2sv2_probe(struct snd_soc_dai *dai,
 			   unsigned long base);
 
 /**
+ * s3c_i2sv2_cleanup - cleanup resources allocated in s3c_i2sv2_probe
+ * @dai: The ASoC DAI structure supplied to the original probe.
+ * @i2s: Our local i2s structure to fill in.
+ */
+extern void s3c_i2sv2_cleanup(struct snd_soc_dai *dai,
+			      struct s3c_i2sv2_info *i2s);
+/**
  * s3c_i2sv2_register_component - register component and dai with soc core
  * @dev: DAI device
  * @id: DAI ID
diff --git a/sound/soc/samsung/s3c2412-i2s.c b/sound/soc/samsung/s3c2412-i2s.c
index bcd1cbdeac93..005cd6db7d07 100644
--- a/sound/soc/samsung/s3c2412-i2s.c
+++ b/sound/soc/samsung/s3c2412-i2s.c
@@ -65,7 +65,8 @@ static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
 	s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
 	if (IS_ERR(s3c2412_i2s.iis_cclk)) {
 		pr_err("failed to get i2sclk clock\n");
-		return PTR_ERR(s3c2412_i2s.iis_cclk);
+		ret = PTR_ERR(s3c2412_i2s.iis_cclk);
+		goto err;
 	}
 
 	/* Set MPLL as the source for IIS CLK */
@@ -73,7 +74,7 @@ static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
 	clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
 	ret = clk_prepare_enable(s3c2412_i2s.iis_cclk);
 	if (ret)
-		return ret;
+		goto err;
 
 	s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
 
@@ -82,11 +83,17 @@ static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
 			      S3C_GPIO_PULL_NONE);
 
 	return 0;
+
+err:
+	s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
+
+	return ret;
 }
 
 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
 {
 	clk_disable_unprepare(s3c2412_i2s.iis_cclk);
+	s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
 
 	return 0;
 }
-- 
2.11.0