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>

1 files changed, 4 insertions, 11 deletions

diff --git a/sound/soc/codecs/rt5682-i2c.c b/sound/soc/codecs/rt5682-i2c.c
index 20e0f90ea498..20fc0f3766de 100644
--- 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);