[PATCH 1/3] ASoC: core: Add card mutex locking subclasses

[PATCH 1/3] ASoC: core: Add card mutex locking subclasses

[Liam Girdwood]

This is the first part of a change that is intended to improve
ASoC locking protection for DAPM and PCM operations.

This part of the series adds a mutex class for the soc_card mutex. The
SND_SOC_CARD_CLASS_INIT class is used for card initialisation only whilst the
SND_SOC_CARD_CLASS_PCM class is used for the forth coming Dynamic
PCM operations. The new mutex classes are required otherwise we will see a false
positive mutex deadlock warning between the card initialisation and the PCM
operations (something that would never deadlock in real life).

Signed-off-by: Liam Girdwood <lrg@ti.com>
---
 include/sound/soc.h  |    5 +++++
 sound/soc/soc-core.c |    2 +-
 2 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 2ebf787..70de2f8 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -288,6 +288,11 @@ enum snd_soc_pcm_subclass {
 	SND_SOC_PCM_CLASS_BE	= 1,
 };
 
+enum snd_soc_card_subclass {
+	SND_SOC_CARD_CLASS_INIT	= 0,
+	SND_SOC_CARD_CLASS_PCM	= 1,
+};
+
 int snd_soc_codec_set_sysclk(struct snd_soc_codec *codec, int clk_id,
 			     int source, unsigned int freq, int dir);
 int snd_soc_codec_set_pll(struct snd_soc_codec *codec, int pll_id, int source,
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index c90bb01..acd0d93 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1416,7 +1416,7 @@ static void snd_soc_instantiate_card(struct snd_soc_card *card)
 	struct snd_soc_dai_link *dai_link;
 	int ret, i, order;
 
-	mutex_lock(&card->mutex);
+	mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_INIT);
 
 	if (card->instantiated) {
 		mutex_unlock(&card->mutex);
-- 
1.7.5.4

[PATCH 2/3] ASoC: dapm: Use DAPM mutex for DAPM ops instead of codec mutex.

[Liam Girdwood]

It has now become necessary to use a DAPM mutex instead of the codec
mutex to lock the DAPM operations. This is due to the recent multi
component support and forth coming Dynamic PCM updates.

Currently we lock DAPM operations with the codec mutex of the calling
RTD context. However, DAPM operations can span the whole card context
and all components.

This patch updates the DAPM operations that use the codec mutex to
now use the DAPM mutex PCM subclass for all DAPM ops.

We also add a mutex subclass for DAPM init and PCM operations.

Signed-off-by: Liam Girdwood <lrg@ti.com>
---
 include/sound/soc-dapm.h |    5 ++++
 include/sound/soc.h      |    1 +
 sound/soc/soc-core.c     |    1 +
 sound/soc/soc-dapm.c     |   59 ++++++++++++++++++++++++++++++---------------
 4 files changed, 46 insertions(+), 20 deletions(-)

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index e46107f..6727384 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -431,6 +431,11 @@ enum snd_soc_dapm_type {
 	snd_soc_dapm_dai,		/* link to DAI structure */
 };
 
+enum snd_soc_dapm_subclass {
+	SND_SOC_DAPM_CLASS_INIT	= 0,
+	SND_SOC_DAPM_CLASS_PCM	= 1,
+};
+
 /*
  * DAPM audio route definition.
  *
diff --git a/include/sound/soc.h b/include/sound/soc.h
index 70de2f8..66fd9bc 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -805,6 +805,7 @@ struct snd_soc_card {
 
 	struct list_head list;
 	struct mutex mutex;
+	struct mutex dapm_mutex;
 
 	bool instantiated;
 
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index acd0d93..5aef34a 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3125,6 +3125,7 @@ int snd_soc_register_card(struct snd_soc_card *card)
 	INIT_LIST_HEAD(&card->dapm_dirty);
 	card->instantiated = 0;
 	mutex_init(&card->mutex);
+	mutex_init(&card->dapm_mutex);
 
 	mutex_lock(&client_mutex);
 	list_add(&card->list, &card_list);
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index a837977..5beaa3e 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1971,6 +1971,8 @@ static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
  */
 int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
 {
+	int ret;
+
 	/*
 	 * Suppress early reports (eg, jacks syncing their state) to avoid
 	 * silly DAPM runs during card startup.
@@ -1978,7 +1980,10 @@ int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
 	if (!dapm->card || !dapm->card->instantiated)
 		return 0;
 
-	return dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
+	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_PCM);
+	ret = dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
+	mutex_unlock(&dapm->card->dapm_mutex);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);
 
@@ -2144,6 +2149,7 @@ int snd_soc_dapm_add_routes(struct snd_soc_dapm_context *dapm,
 {
 	int i, ret;
 
+	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
 	for (i = 0; i < num; i++) {
 		ret = snd_soc_dapm_add_route(dapm, route);
 		if (ret < 0) {
@@ -2153,6 +2159,7 @@ int snd_soc_dapm_add_routes(struct snd_soc_dapm_context *dapm,
 		}
 		route++;
 	}
+	mutex_unlock(&dapm->card->dapm_mutex);
 
 	return 0;
 }
@@ -2225,12 +2232,14 @@ int snd_soc_dapm_weak_routes(struct snd_soc_dapm_context *dapm,
 	int i, err;
 	int ret = 0;
 
+	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
 	for (i = 0; i < num; i++) {
 		err = snd_soc_dapm_weak_route(dapm, route);
 		if (err)
 			ret = err;
 		route++;
 	}
+	mutex_unlock(&dapm->card->dapm_mutex);
 
 	return ret;
 }
@@ -2249,6 +2258,8 @@ int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
 	struct snd_soc_dapm_widget *w;
 	unsigned int val;
 
+	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
+
 	list_for_each_entry(w, &dapm->card->widgets, list)
 	{
 		if (w->new)
@@ -2258,8 +2269,10 @@ int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
 			w->kcontrols = kzalloc(w->num_kcontrols *
 						sizeof(struct snd_kcontrol *),
 						GFP_KERNEL);
-			if (!w->kcontrols)
+			if (!w->kcontrols) {
+				mutex_unlock(&dapm->card->dapm_mutex);
 				return -ENOMEM;
+			}
 		}
 
 		switch(w->id) {
@@ -2299,6 +2312,7 @@ int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
 	}
 
 	dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
+	mutex_unlock(&dapm->card->dapm_mutex);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_widgets);
@@ -2358,6 +2372,7 @@ int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
 	struct snd_soc_codec *codec = widget->codec;
+	struct snd_soc_card *card = codec->card;
 	struct soc_mixer_control *mc =
 		(struct soc_mixer_control *)kcontrol->private_value;
 	unsigned int reg = mc->reg;
@@ -2384,7 +2399,7 @@ int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
 		/* old connection must be powered down */
 		connect = invert ? 1 : 0;
 
-	mutex_lock(&codec->mutex);
+	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_PCM);
 
 	change = snd_soc_test_bits(widget->codec, reg, mask, val);
 	if (change) {
@@ -2406,7 +2421,7 @@ int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
 		}
 	}
 
-	mutex_unlock(&codec->mutex);
+	mutex_unlock(&card->dapm_mutex);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_volsw);
@@ -2455,6 +2470,7 @@ int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
 	struct snd_soc_codec *codec = widget->codec;
+	struct snd_soc_card *card = codec->card;
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	unsigned int val, mux, change;
 	unsigned int mask, bitmask;
@@ -2475,7 +2491,7 @@ int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
 		mask |= (bitmask - 1) << e->shift_r;
 	}
 
-	mutex_lock(&codec->mutex);
+	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_PCM);
 
 	change = snd_soc_test_bits(widget->codec, e->reg, mask, val);
 	if (change) {
@@ -2497,7 +2513,7 @@ int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
 		}
 	}
 
-	mutex_unlock(&codec->mutex);
+	mutex_unlock(&card->dapm_mutex);
 	return change;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);
@@ -2534,6 +2550,7 @@ int snd_soc_dapm_put_enum_virt(struct snd_kcontrol *kcontrol,
 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
 	struct snd_soc_codec *codec = widget->codec;
+	struct snd_soc_card *card = codec->card;
 	struct soc_enum *e =
 		(struct soc_enum *)kcontrol->private_value;
 	int change;
@@ -2543,7 +2560,7 @@ int snd_soc_dapm_put_enum_virt(struct snd_kcontrol *kcontrol,
 	if (ucontrol->value.enumerated.item[0] >= e->max)
 		return -EINVAL;
 
-	mutex_lock(&codec->mutex);
+	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_PCM);
 
 	change = widget->value != ucontrol->value.enumerated.item[0];
 	if (change) {
@@ -2556,7 +2573,7 @@ int snd_soc_dapm_put_enum_virt(struct snd_kcontrol *kcontrol,
 		}
 	}
 
-	mutex_unlock(&codec->mutex);
+	mutex_unlock(&card->dapm_mutex);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_virt);
@@ -2621,6 +2638,7 @@ int snd_soc_dapm_put_value_enum_double(struct snd_kcontrol *kcontrol,
 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
 	struct snd_soc_codec *codec = widget->codec;
+	struct snd_soc_card *card = codec->card;
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	unsigned int val, mux, change;
 	unsigned int mask;
@@ -2639,7 +2657,7 @@ int snd_soc_dapm_put_value_enum_double(struct snd_kcontrol *kcontrol,
 		mask |= e->mask << e->shift_r;
 	}
 
-	mutex_lock(&codec->mutex);
+	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_PCM);
 
 	change = snd_soc_test_bits(widget->codec, e->reg, mask, val);
 	if (change) {
@@ -2661,7 +2679,7 @@ int snd_soc_dapm_put_value_enum_double(struct snd_kcontrol *kcontrol,
 		}
 	}
 
-	mutex_unlock(&codec->mutex);
+	mutex_unlock(&card->dapm_mutex);
 	return change;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_value_enum_double);
@@ -2698,12 +2716,12 @@ int snd_soc_dapm_get_pin_switch(struct snd_kcontrol *kcontrol,
 	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
 	const char *pin = (const char *)kcontrol->private_value;
 
-	mutex_lock(&card->mutex);
+	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_PCM);
 
 	ucontrol->value.integer.value[0] =
 		snd_soc_dapm_get_pin_status(&card->dapm, pin);
 
-	mutex_unlock(&card->mutex);
+	mutex_unlock(&card->dapm_mutex);
 
 	return 0;
 }
@@ -2721,17 +2739,16 @@ int snd_soc_dapm_put_pin_switch(struct snd_kcontrol *kcontrol,
 	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
 	const char *pin = (const char *)kcontrol->private_value;
 
-	mutex_lock(&card->mutex);
+	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_PCM);
 
 	if (ucontrol->value.integer.value[0])
 		snd_soc_dapm_enable_pin(&card->dapm, pin);
 	else
 		snd_soc_dapm_disable_pin(&card->dapm, pin);
 
-	snd_soc_dapm_sync(&card->dapm);
-
-	mutex_unlock(&card->mutex);
+	mutex_unlock(&card->dapm_mutex);
 
+	snd_soc_dapm_sync(&card->dapm);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_pin_switch);
@@ -2849,6 +2866,7 @@ int snd_soc_dapm_new_controls(struct snd_soc_dapm_context *dapm,
 	struct snd_soc_dapm_widget *w;
 	int i;
 
+	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
 	for (i = 0; i < num; i++) {
 		w = snd_soc_dapm_new_control(dapm, widget);
 		if (!w) {
@@ -2859,6 +2877,7 @@ int snd_soc_dapm_new_controls(struct snd_soc_dapm_context *dapm,
 		}
 		widget++;
 	}
+	mutex_unlock(&dapm->card->dapm_mutex);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_controls);
@@ -3013,11 +3032,11 @@ static void soc_dapm_stream_event(struct snd_soc_dapm_context *dapm,
 int snd_soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
 			      struct snd_soc_dai *dai, int event)
 {
-	struct snd_soc_codec *codec = rtd->codec;
+	struct snd_soc_card *card = rtd->card;
 
-	mutex_lock(&codec->mutex);
-	soc_dapm_stream_event(&codec->dapm, stream, dai, event);
-	mutex_unlock(&codec->mutex);
+	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_PCM);
+	soc_dapm_stream_event(&card->dapm, stream, dai, event);
+	mutex_unlock(&card->dapm_mutex);
 	return 0;
 }
 
-- 
1.7.5.4

Re: [PATCH 2/3] ASoC: dapm: Use DAPM mutex for DAPM ops instead of codec mutex.

[Mark Brown]

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On Wed, Mar 07, 2012 at 10:38:26AM +0000, Liam Girdwood wrote:

Applied, thanks.

> +enum snd_soc_dapm_subclass {
> +	SND_SOC_DAPM_CLASS_INIT	= 0,
> +	SND_SOC_DAPM_CLASS_PCM	= 1,

I think I'd rather this were called _RUNTIME or something, we may not
have a stream involved at all in some cases.

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Re: [PATCH 2/3] ASoC: dapm: Use DAPM mutex for DAPM ops instead of codec mutex.

[Liam Girdwood]

On Wed, 2012-03-07 at 19:46 +0000, Mark Brown wrote:
> On Wed, Mar 07, 2012 at 10:38:26AM +0000, Liam Girdwood wrote:
> 
> Applied, thanks.
> 
> > +enum snd_soc_dapm_subclass {
> > +	SND_SOC_DAPM_CLASS_INIT	= 0,
> > +	SND_SOC_DAPM_CLASS_PCM	= 1,
> 
> I think I'd rather this were called _RUNTIME or something, we may not
> have a stream involved at all in some cases.

I'll update this incrementally.

Liam

[PATCH 3/3] ASoC: dapm: lock mixer & mux update power with DAPM mutex.

[Liam Girdwood]

Both snd_soc_dapm_mux_update_power() and snd_soc_dapm_mixer_update_power() can
be called internally within DAPM core (with DAPM mutex held) and externally.

Provide some wrappers so that external users of both functions do not have to
remeber and hold the DAPM mutex.

Signed-off-by: Liam Girdwood <lrg@ti.com>
---
 sound/soc/soc-dapm.c |   36 ++++++++++++++++++++++++++++++------
 1 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 5beaa3e..5c83b83 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1741,7 +1741,7 @@ static inline void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
 #endif
 
 /* test and update the power status of a mux widget */
-int snd_soc_dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
+static int soc_dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
 				 struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e)
 {
 	struct snd_soc_dapm_path *path;
@@ -1780,10 +1780,22 @@ int snd_soc_dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
 
 	return 0;
 }
+
+int snd_soc_dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
+		struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e)
+{
+	struct snd_soc_card *card = widget->dapm->card;
+	int ret;
+
+	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_PCM);
+	ret = soc_dapm_mux_update_power(widget, kcontrol, mux, e);
+	mutex_unlock(&card->dapm_mutex);
+	return ret;
+}
 EXPORT_SYMBOL_GPL(snd_soc_dapm_mux_update_power);
 
 /* test and update the power status of a mixer or switch widget */
-int snd_soc_dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
+static int soc_dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
 				   struct snd_kcontrol *kcontrol, int connect)
 {
 	struct snd_soc_dapm_path *path;
@@ -1812,6 +1824,18 @@ int snd_soc_dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
 
 	return 0;
 }
+
+int snd_soc_dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
+				struct snd_kcontrol *kcontrol, int connect)
+{
+	struct snd_soc_card *card = widget->dapm->card;
+	int ret;
+
+	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_PCM);
+	ret = soc_dapm_mixer_update_power(widget, kcontrol, connect);
+	mutex_unlock(&card->dapm_mutex);
+	return ret;
+}
 EXPORT_SYMBOL_GPL(snd_soc_dapm_mixer_update_power);
 
 /* show dapm widget status in sys fs */
@@ -2415,7 +2439,7 @@ int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
 			update.val = val;
 			widget->dapm->update = &update;
 
-			snd_soc_dapm_mixer_update_power(widget, kcontrol, connect);
+			soc_dapm_mixer_update_power(widget, kcontrol, connect);
 
 			widget->dapm->update = NULL;
 		}
@@ -2507,7 +2531,7 @@ int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
 			update.val = val;
 			widget->dapm->update = &update;
 
-			snd_soc_dapm_mux_update_power(widget, kcontrol, mux, e);
+			soc_dapm_mux_update_power(widget, kcontrol, mux, e);
 
 			widget->dapm->update = NULL;
 		}
@@ -2569,7 +2593,7 @@ int snd_soc_dapm_put_enum_virt(struct snd_kcontrol *kcontrol,
 
 			widget->value = ucontrol->value.enumerated.item[0];
 
-			snd_soc_dapm_mux_update_power(widget, kcontrol, widget->value, e);
+			soc_dapm_mux_update_power(widget, kcontrol, widget->value, e);
 		}
 	}
 
@@ -2673,7 +2697,7 @@ int snd_soc_dapm_put_value_enum_double(struct snd_kcontrol *kcontrol,
 			update.val = val;
 			widget->dapm->update = &update;
 
-			snd_soc_dapm_mux_update_power(widget, kcontrol, mux, e);
+			soc_dapm_mux_update_power(widget, kcontrol, mux, e);
 
 			widget->dapm->update = NULL;
 		}
-- 
1.7.5.4

Re: [PATCH 3/3] ASoC: dapm: lock mixer & mux update power with DAPM mutex.

[Mark Brown]

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On Wed, Mar 07, 2012 at 10:38:27AM +0000, Liam Girdwood wrote:
> Both snd_soc_dapm_mux_update_power() and snd_soc_dapm_mixer_update_power() can
> be called internally within DAPM core (with DAPM mutex held) and externally.

Applied with typo fixes to the changelog.

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Re: [PATCH 1/3] ASoC: core: Add card mutex locking subclasses

[Mark Brown]

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On Wed, Mar 07, 2012 at 10:38:25AM +0000, Liam Girdwood wrote:
> This is the first part of a change that is intended to improve
> ASoC locking protection for DAPM and PCM operations.

Applied, thanks.

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