linux-kernel - [PATCH 09/15] ASoC: ams-delta: Update locking around use of DAPM pin API

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Date:	Mon, 17 Feb 2014 16:51:37 +0000
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	broonie@...nel.org
Cc:	myungjoo.ham@...sung.com, cw00.choi@...sung.com,
	dmitry.torokhov@...il.com, lgirdwood@...il.com, lars@...afoo.de,
	peter.ujfalusi@...com, jarkko.nikula@...mer.com,
	eric.y.miao@...il.com, haojian.zhuang@...il.com,
	linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
	alsa-devel@...a-project.org, linux@....linux.org.uk
Subject: [PATCH 09/15] ASoC: ams-delta: Update locking around use of DAPM pin API

The pin updates in this driver look like they are intended to be done
atomically, update to do so.

Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---
 sound/soc/omap/ams-delta.c |   38 +++++++++++++++++++++++---------------
 1 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/sound/soc/omap/ams-delta.c b/sound/soc/omap/ams-delta.c
index 6294464..73deddf 100644
--- a/sound/soc/omap/ams-delta.c
+++ b/sound/soc/omap/ams-delta.c
@@ -113,46 +113,52 @@ static int ams_delta_set_audio_mode(struct snd_kcontrol *kcontrol,
 
 	/* Setup pins after corresponding bits if changed */
 	pin = !!(pins & (1 << AMS_DELTA_MOUTHPIECE));
+
+	mutex_lock(&dapm->card->dapm_mutex);
+
 	if (pin != snd_soc_dapm_get_pin_status(dapm, "Mouthpiece")) {
 		changed = 1;
 		if (pin)
-			snd_soc_dapm_enable_pin(dapm, "Mouthpiece");
+			snd_soc_dapm_enable_pin_locked(dapm, "Mouthpiece");
 		else
-			snd_soc_dapm_disable_pin(dapm, "Mouthpiece");
+			snd_soc_dapm_disable_pin_locked(dapm, "Mouthpiece");
 	}
 	pin = !!(pins & (1 << AMS_DELTA_EARPIECE));
 	if (pin != snd_soc_dapm_get_pin_status(dapm, "Earpiece")) {
 		changed = 1;
 		if (pin)
-			snd_soc_dapm_enable_pin(dapm, "Earpiece");
+			snd_soc_dapm_enable_pin_locked(dapm, "Earpiece");
 		else
-			snd_soc_dapm_disable_pin(dapm, "Earpiece");
+			snd_soc_dapm_disable_pin_locked(dapm, "Earpiece");
 	}
 	pin = !!(pins & (1 << AMS_DELTA_MICROPHONE));
 	if (pin != snd_soc_dapm_get_pin_status(dapm, "Microphone")) {
 		changed = 1;
 		if (pin)
-			snd_soc_dapm_enable_pin(dapm, "Microphone");
+			snd_soc_dapm_enable_pin_locked(dapm, "Microphone");
 		else
-			snd_soc_dapm_disable_pin(dapm, "Microphone");
+			snd_soc_dapm_disable_pin_locked(dapm, "Microphone");
 	}
 	pin = !!(pins & (1 << AMS_DELTA_SPEAKER));
 	if (pin != snd_soc_dapm_get_pin_status(dapm, "Speaker")) {
 		changed = 1;
 		if (pin)
-			snd_soc_dapm_enable_pin(dapm, "Speaker");
+			snd_soc_dapm_enable_pin_locked(dapm, "Speaker");
 		else
-			snd_soc_dapm_disable_pin(dapm, "Speaker");
+			snd_soc_dapm_disable_pin_locked(dapm, "Speaker");
 	}
 	pin = !!(pins & (1 << AMS_DELTA_AGC));
 	if (pin != ams_delta_audio_agc) {
 		ams_delta_audio_agc = pin;
 		changed = 1;
 		if (pin)
-			snd_soc_dapm_enable_pin(dapm, "AGCIN");
+			snd_soc_dapm_enable_pin_locked(dapm, "AGCIN");
 		else
-			snd_soc_dapm_disable_pin(dapm, "AGCIN");
+			snd_soc_dapm_disable_pin_locked(dapm, "AGCIN");
 	}
+
+	mutex_unlock(&dapm->card->dapm_mutex);
+
 	if (changed)
 		snd_soc_dapm_sync(dapm);
 
@@ -315,11 +321,13 @@ static void cx81801_close(struct tty_struct *tty)
 	v253_ops.close(tty);
 
 	/* Revert back to default audio input/output constellation */
-	snd_soc_dapm_disable_pin(dapm, "Mouthpiece");
-	snd_soc_dapm_enable_pin(dapm, "Earpiece");
-	snd_soc_dapm_enable_pin(dapm, "Microphone");
-	snd_soc_dapm_disable_pin(dapm, "Speaker");
-	snd_soc_dapm_disable_pin(dapm, "AGCIN");
+	mutex_lock(&dapm->card->dapm_mutex);
+	snd_soc_dapm_disable_pin_locked(dapm, "Mouthpiece");
+	snd_soc_dapm_enable_pin_locked(dapm, "Earpiece");
+	snd_soc_dapm_enable_pin_locked(dapm, "Microphone");
+	snd_soc_dapm_disable_pin_locked(dapm, "Speaker");
+	snd_soc_dapm_disable_pin_locked(dapm, "AGCIN");
+	mutex_unlock(&dapm->card->dapm_mutex);
 	snd_soc_dapm_sync(dapm);
 }
 
-- 
1.7.2.5

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