ASoC: rt5682: Fix deadlock on resume

On resume from suspend the following chain of events can happen:
A rt5682_resume() -> mod_delayed_work() for jack_detect_work
B DAPM sequence starts ( DAPM is locked now)

A1. rt5682_jack_detect_handler() scheduled
 - Takes both jdet_mutex and calibrate_mutex
 - Calls in to rt5682_headset_detect() which tries to take DAPM lock, it
   starts to wait for it as B path took it already.
B1. DAPM sequence reaches the "HP Amp", rt5682_hp_event() tries to take
    the jdet_mutex, but it is locked in A1, so it waits.

Deadlock.

To solve the deadlock, drop the jdet_mutex, use the jack_detect_work to do
the jack removal handling, move the dapm lock up one level to protect the
most of the rt5682_jack_detect_handler(), but not the jack reporting as it
might trigger a DAPM sequence.
The rt5682_headset_detect() can be changed to static as well.

Fixes: 8deb34a90f063 ("ASoC: rt5682: fix the wrong jack type detected")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20220126100325.16513-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/rt5682-i2c.c b/sound/soc/codecs/rt5682-i2c.c
index 20e0f90ea49863dddc81930ebe93adfcd130850d..20fc0f3766dedc4ce03b308985420831534dd557 100644 (file)
--- a/sound/soc/codecs/rt5682-i2c.c
+++ b/sound/soc/codecs/rt5682-i2c.c
@@ -59,18 +59,12 @@ static void rt5682_jd_check_handler(struct work_struct *work)
        struct rt5682_priv *rt5682 = container_of(work, struct rt5682_priv,
                jd_check_work.work);
 
-       if (snd_soc_component_read(rt5682->component, RT5682_AJD1_CTRL)
-               & RT5682_JDH_RS_MASK) {
+       if (snd_soc_component_read(rt5682->component, RT5682_AJD1_CTRL) & RT5682_JDH_RS_MASK)
                /* jack out */
-               rt5682->jack_type = rt5682_headset_detect(rt5682->component, 0);
-
-               snd_soc_jack_report(rt5682->hs_jack, rt5682->jack_type,
-                       SND_JACK_HEADSET |
-                       SND_JACK_BTN_0 | SND_JACK_BTN_1 |
-                       SND_JACK_BTN_2 | SND_JACK_BTN_3);
-       } else {
+               mod_delayed_work(system_power_efficient_wq,
+                                &rt5682->jack_detect_work, 0);
+       else
                schedule_delayed_work(&rt5682->jd_check_work, 500);
-       }
 }
 
 static irqreturn_t rt5682_irq(int irq, void *data)
@@ -198,7 +192,6 @@ static int rt5682_i2c_probe(struct i2c_client *i2c,
        }
 
        mutex_init(&rt5682->calibrate_mutex);
-       mutex_init(&rt5682->jdet_mutex);
        rt5682_calibrate(rt5682);
 
        rt5682_apply_patch_list(rt5682, &i2c->dev);

diff --git a/sound/soc/codecs/rt5682.c b/sound/soc/codecs/rt5682.c
index 415ec564c82e224c33a85fd92ada9b620d1b09c2..0a0ec4a021e111785b34875b8fbadbbaf2608343 100644 (file)
--- a/sound/soc/codecs/rt5682.c
+++ b/sound/soc/codecs/rt5682.c
@@ -922,15 +922,13 @@ static void rt5682_enable_push_button_irq(struct snd_soc_component *component,
  *
  * Returns detect status.
  */
-int rt5682_headset_detect(struct snd_soc_component *component, int jack_insert)
+static int rt5682_headset_detect(struct snd_soc_component *component, int jack_insert)
 {
        struct rt5682_priv *rt5682 = snd_soc_component_get_drvdata(component);
        struct snd_soc_dapm_context *dapm = &component->dapm;
        unsigned int val, count;
 
        if (jack_insert) {
-               snd_soc_dapm_mutex_lock(dapm);
-
                snd_soc_component_update_bits(component, RT5682_PWR_ANLG_1,
                        RT5682_PWR_VREF2 | RT5682_PWR_MB,
                        RT5682_PWR_VREF2 | RT5682_PWR_MB);
@@ -981,8 +979,6 @@ int rt5682_headset_detect(struct snd_soc_component *component, int jack_insert)
                snd_soc_component_update_bits(component, RT5682_MICBIAS_2,
                        RT5682_PWR_CLK25M_MASK | RT5682_PWR_CLK1M_MASK,
                        RT5682_PWR_CLK25M_PU | RT5682_PWR_CLK1M_PU);
-
-               snd_soc_dapm_mutex_unlock(dapm);
        } else {
                rt5682_enable_push_button_irq(component, false);
                snd_soc_component_update_bits(component, RT5682_CBJ_CTRL_1,
@@ -1011,7 +1007,6 @@ int rt5682_headset_detect(struct snd_soc_component *component, int jack_insert)
        dev_dbg(component->dev, "jack_type = %d\n", rt5682->jack_type);
        return rt5682->jack_type;
 }
-EXPORT_SYMBOL_GPL(rt5682_headset_detect);
 
 static int rt5682_set_jack_detect(struct snd_soc_component *component,
                struct snd_soc_jack *hs_jack, void *data)
@@ -1094,6 +1089,7 @@ void rt5682_jack_detect_handler(struct work_struct *work)
 {
        struct rt5682_priv *rt5682 =
                container_of(work, struct rt5682_priv, jack_detect_work.work);
+       struct snd_soc_dapm_context *dapm;
        int val, btn_type;
 
        while (!rt5682->component)
@@ -1102,7 +1098,9 @@ void rt5682_jack_detect_handler(struct work_struct *work)
        while (!rt5682->component->card->instantiated)
                usleep_range(10000, 15000);
 
-       mutex_lock(&rt5682->jdet_mutex);
+       dapm = snd_soc_component_get_dapm(rt5682->component);
+
+       snd_soc_dapm_mutex_lock(dapm);
        mutex_lock(&rt5682->calibrate_mutex);
 
        val = snd_soc_component_read(rt5682->component, RT5682_AJD1_CTRL)
@@ -1162,6 +1160,9 @@ void rt5682_jack_detect_handler(struct work_struct *work)
                rt5682->irq_work_delay_time = 50;
        }
 
+       mutex_unlock(&rt5682->calibrate_mutex);
+       snd_soc_dapm_mutex_unlock(dapm);
+
        snd_soc_jack_report(rt5682->hs_jack, rt5682->jack_type,
                SND_JACK_HEADSET |
                SND_JACK_BTN_0 | SND_JACK_BTN_1 |
@@ -1174,9 +1175,6 @@ void rt5682_jack_detect_handler(struct work_struct *work)
                else
                        cancel_delayed_work_sync(&rt5682->jd_check_work);
        }
-
-       mutex_unlock(&rt5682->calibrate_mutex);
-       mutex_unlock(&rt5682->jdet_mutex);
 }
 EXPORT_SYMBOL_GPL(rt5682_jack_detect_handler);
 
@@ -1526,7 +1524,6 @@ static int rt5682_hp_event(struct snd_soc_dapm_widget *w,
 {
        struct snd_soc_component *component =
                snd_soc_dapm_to_component(w->dapm);
-       struct rt5682_priv *rt5682 = snd_soc_component_get_drvdata(component);
 
        switch (event) {
        case SND_SOC_DAPM_PRE_PMU:
@@ -1538,17 +1535,12 @@ static int rt5682_hp_event(struct snd_soc_dapm_widget *w,
                        RT5682_DEPOP_1, 0x60, 0x60);
                snd_soc_component_update_bits(component,
                        RT5682_DAC_ADC_DIG_VOL1, 0x00c0, 0x0080);
-
-               mutex_lock(&rt5682->jdet_mutex);
-
                snd_soc_component_update_bits(component, RT5682_HP_CTRL_2,
                        RT5682_HP_C2_DAC_L_EN | RT5682_HP_C2_DAC_R_EN,
                        RT5682_HP_C2_DAC_L_EN | RT5682_HP_C2_DAC_R_EN);
                usleep_range(5000, 10000);
                snd_soc_component_update_bits(component, RT5682_CHARGE_PUMP_1,
                        RT5682_CP_SW_SIZE_MASK, RT5682_CP_SW_SIZE_L);
-
-               mutex_unlock(&rt5682->jdet_mutex);
                break;
 
        case SND_SOC_DAPM_POST_PMD:

diff --git a/sound/soc/codecs/rt5682.h b/sound/soc/codecs/rt5682.h
index c917c76200ea2b44a68948b99f676c2ab613dd18..52ff0d9c36c5817d36d0b4f89a77128d47096d15 100644 (file)
--- a/sound/soc/codecs/rt5682.h
+++ b/sound/soc/codecs/rt5682.h
@@ -1463,7 +1463,6 @@ struct rt5682_priv {
 
        int jack_type;
        int irq_work_delay_time;
-       struct mutex jdet_mutex;
 };
 
 extern const char *rt5682_supply_names[RT5682_NUM_SUPPLIES];
@@ -1473,7 +1472,6 @@ int rt5682_sel_asrc_clk_src(struct snd_soc_component *component,
 
 void rt5682_apply_patch_list(struct rt5682_priv *rt5682, struct device *dev);
 
-int rt5682_headset_detect(struct snd_soc_component *component, int jack_insert);
 void rt5682_jack_detect_handler(struct work_struct *work);
 
 bool rt5682_volatile_register(struct device *dev, unsigned int reg);