linux-kernel - [PATCH 3/7] ASoC: stm32: i2s: fix stream count management

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Date:   Tue, 26 Feb 2019 14:51:06 +0100
From:   Olivier Moysan <olivier.moysan@...com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <alsa-devel@...a-project.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-kernel@...r.kernel.org>, <olivier.moysan@...com>,
        <arnaud.pouliquen@...com>, <benjamin.gaignard@...com>
Subject: [PATCH 3/7] ASoC: stm32: i2s: fix stream count management

Move counter handling to trigger start section
to manage multiple start/stop events.

Signed-off-by: Olivier Moysan <olivier.moysan@...com>
---
 sound/soc/stm/stm32_i2s.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/sound/soc/stm/stm32_i2s.c b/sound/soc/stm/stm32_i2s.c
index 7d4c67433916..7f56d7b51ba3 100644
--- a/sound/soc/stm/stm32_i2s.c
+++ b/sound/soc/stm/stm32_i2s.c
@@ -554,10 +554,6 @@ static int stm32_i2s_startup(struct snd_pcm_substream *substream,
 		return ret;
 	}
 
-	spin_lock(&i2s->lock_fd);
-	i2s->refcount++;
-	spin_unlock(&i2s->lock_fd);
-
 	return regmap_write_bits(i2s->regmap, STM32_I2S_IFCR_REG,
 				 I2S_IFCR_MASK, I2S_IFCR_MASK);
 }
@@ -613,18 +609,19 @@ static int stm32_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 		regmap_write_bits(i2s->regmap, STM32_I2S_IFCR_REG,
 				  I2S_IFCR_MASK, I2S_IFCR_MASK);
 
+		spin_lock(&i2s->lock_fd);
+		i2s->refcount++;
 		if (playback_flg) {
 			ier = I2S_IER_UDRIE;
 		} else {
 			ier = I2S_IER_OVRIE;
 
-			spin_lock(&i2s->lock_fd);
 			if (i2s->refcount == 1)
 				/* dummy write to trigger capture */
 				regmap_write(i2s->regmap,
 					     STM32_I2S_TXDR_REG, 0);
-			spin_unlock(&i2s->lock_fd);
 		}
+		spin_unlock(&i2s->lock_fd);
 
 		if (STM32_I2S_IS_SLAVE(i2s))
 			ier |= I2S_IER_TIFREIE;
@@ -649,7 +646,6 @@ static int stm32_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 			spin_unlock(&i2s->lock_fd);
 			break;
 		}
-		spin_unlock(&i2s->lock_fd);
 
 		dev_dbg(cpu_dai->dev, "stop I2S\n");
 
@@ -657,8 +653,10 @@ static int stm32_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 					 I2S_CR1_SPE, 0);
 		if (ret < 0) {
 			dev_err(cpu_dai->dev, "Error %d disabling I2S\n", ret);
+			spin_unlock(&i2s->lock_fd);
 			return ret;
 		}
+		spin_unlock(&i2s->lock_fd);
 
 		cfg1_mask = I2S_CFG1_RXDMAEN | I2S_CFG1_TXDMAEN;
 		regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG,
-- 
2.7.4