linux-kernel - [PATCH 08/15] ASoC: mfld_machine: Update locking around use of DAPM pin API

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Date:	Mon, 17 Feb 2014 16:51:36 +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 08/15] ASoC: mfld_machine: 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/intel/mfld_machine.c |   43 +++++++++++++++++++++++++++-------------
 1 files changed, 29 insertions(+), 14 deletions(-)

diff --git a/sound/soc/intel/mfld_machine.c b/sound/soc/intel/mfld_machine.c
index d3d4c32..4b60542 100644
--- a/sound/soc/intel/mfld_machine.c
+++ b/sound/soc/intel/mfld_machine.c
@@ -105,15 +105,20 @@ static int headset_set_switch(struct snd_kcontrol *kcontrol,
 	if (ucontrol->value.integer.value[0] == hs_switch)
 		return 0;
 
+	mutex_lock(&codec->dapm.card->dapm_mutex);
+
 	if (ucontrol->value.integer.value[0]) {
 		pr_debug("hs_set HS path\n");
-		snd_soc_dapm_enable_pin(&codec->dapm, "Headphones");
-		snd_soc_dapm_disable_pin(&codec->dapm, "EPOUT");
+		snd_soc_dapm_enable_pin_locked(&codec->dapm, "Headphones");
+		snd_soc_dapm_disable_pin_locked(&codec->dapm, "EPOUT");
 	} else {
 		pr_debug("hs_set EP path\n");
-		snd_soc_dapm_disable_pin(&codec->dapm, "Headphones");
-		snd_soc_dapm_enable_pin(&codec->dapm, "EPOUT");
+		snd_soc_dapm_disable_pin_locked(&codec->dapm, "Headphones");
+		snd_soc_dapm_enable_pin_locked(&codec->dapm, "EPOUT");
 	}
+
+	mutex_unlock(&codec->dapm.card->dapm_mutex);
+
 	snd_soc_dapm_sync(&codec->dapm);
 	hs_switch = ucontrol->value.integer.value[0];
 
@@ -122,19 +127,23 @@ static int headset_set_switch(struct snd_kcontrol *kcontrol,
 
 static void lo_enable_out_pins(struct snd_soc_codec *codec)
 {
-	snd_soc_dapm_enable_pin(&codec->dapm, "IHFOUTL");
-	snd_soc_dapm_enable_pin(&codec->dapm, "IHFOUTR");
-	snd_soc_dapm_enable_pin(&codec->dapm, "LINEOUTL");
-	snd_soc_dapm_enable_pin(&codec->dapm, "LINEOUTR");
-	snd_soc_dapm_enable_pin(&codec->dapm, "VIB1OUT");
-	snd_soc_dapm_enable_pin(&codec->dapm, "VIB2OUT");
+	mutex_lock(&codec->dapm.card->dapm_mutex);
+
+	snd_soc_dapm_enable_pin_locked(&codec->dapm, "IHFOUTL");
+	snd_soc_dapm_enable_pin_locked(&codec->dapm, "IHFOUTR");
+	snd_soc_dapm_enable_pin_locked(&codec->dapm, "LINEOUTL");
+	snd_soc_dapm_enable_pin_locked(&codec->dapm, "LINEOUTR");
+	snd_soc_dapm_enable_pin_locked(&codec->dapm, "VIB1OUT");
+	snd_soc_dapm_enable_pin_locked(&codec->dapm, "VIB2OUT");
 	if (hs_switch) {
-		snd_soc_dapm_enable_pin(&codec->dapm, "Headphones");
-		snd_soc_dapm_disable_pin(&codec->dapm, "EPOUT");
+		snd_soc_dapm_enable_pin_locked(&codec->dapm, "Headphones");
+		snd_soc_dapm_disable_pin_locked(&codec->dapm, "EPOUT");
 	} else {
-		snd_soc_dapm_disable_pin(&codec->dapm, "Headphones");
-		snd_soc_dapm_enable_pin(&codec->dapm, "EPOUT");
+		snd_soc_dapm_disable_pin_locked(&codec->dapm, "Headphones");
+		snd_soc_dapm_enable_pin_locked(&codec->dapm, "EPOUT");
 	}
+
+	mutex_unlock(&codec->dapm.card->dapm_mutex);
 }
 
 static int lo_get_switch(struct snd_kcontrol *kcontrol,
@@ -156,6 +165,9 @@ static int lo_set_switch(struct snd_kcontrol *kcontrol,
 	 * pins and then disable pins not required
 	 */
 	lo_enable_out_pins(codec);
+
+	mutex_lock(&codec->dapm.card->dapm_mutex);
+
 	switch (ucontrol->value.integer.value[0]) {
 	case 0:
 		pr_debug("set vibra path\n");
@@ -185,6 +197,9 @@ static int lo_set_switch(struct snd_kcontrol *kcontrol,
 		snd_soc_update_bits(codec, SN95031_LOCTL, 0x66, 0x66);
 		break;
 	}
+
+	mutex_unlock(&codec->dapm.card->dapm_mutex);
+
 	snd_soc_dapm_sync(&codec->dapm);
 	lo_dac = ucontrol->value.integer.value[0];
 	return 0;
-- 
1.7.2.5

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