[PATCH 2/4] ASoC: rt5659: cancel jack_detect_work on component remove

[Tristan Madani <tristmd@gmail.com>]

From: Tristan Madani <tristan@talencesecurity.com>

rt5659_remove() resets the codec via regmap_write() but does not cancel
the pending jack_detect_work. Since the IRQ is registered with
devm_request_threaded_irq(), it remains active until after the component
remove callback returns.  The IRQ handler (rt5659_irq) schedules
jack_detect_work, so a late interrupt can queue work that runs against a
reset codec.

Track successful IRQ acquisition with a flag so that disable_irq()
only quiesces a line this driver actually owns.  On component remove,
disable the IRQ to synchronize with any running handler and prevent
new enqueues, then drain the residual jack_detect_work synchronously
before resetting the hardware.  On the next component probe (card
rebind), re-enable the IRQ to restore jack detection.

Fixes: d3cb2de2479b ("ASoC: rt5659: add rt5659 codec driver")
Cc: stable@vger.kernel.org
Signed-off-by: Tristan Madani <tristan@talencesecurity.com>
---
 sound/soc/codecs/rt5659.c | 17 ++++++++++++++++-
 sound/soc/codecs/rt5659.h |  2 ++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/rt5659.c b/sound/soc/codecs/rt5659.c
index 3097ee6d4e89f..340d3e7be7a40 100644
--- a/sound/soc/codecs/rt5659.c
+++ b/sound/soc/codecs/rt5659.c
@@ -3664,6 +3664,12 @@ static int rt5659_probe(struct snd_soc_component *component)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_component_to_dapm(component);
 	struct rt5659_priv *rt5659 = snd_soc_component_get_drvdata(component);
+	struct i2c_client *i2c = to_i2c_client(component->dev);
+
+	if (rt5659->irq_disabled) {
+		enable_irq(i2c->irq);
+		rt5659->irq_disabled = false;
+	}
 
 	rt5659->component = component;
 
@@ -3684,7 +3690,14 @@ static int rt5659_probe(struct snd_soc_component *component)
 static void rt5659_remove(struct snd_soc_component *component)
 {
 	struct rt5659_priv *rt5659 = snd_soc_component_get_drvdata(component);
+	struct i2c_client *i2c = to_i2c_client(component->dev);
+
+	if (rt5659->irq_acquired) {
+		disable_irq(i2c->irq);
+		rt5659->irq_disabled = true;
+	}
 
+	cancel_delayed_work_sync(&rt5659->jack_detect_work);
 	regmap_write(rt5659->regmap, RT5659_RESET, 0);
 }
 
@@ -4290,7 +4303,9 @@ static int rt5659_i2c_probe(struct i2c_client *i2c)
 		ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 			rt5659_irq, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
 			| IRQF_ONESHOT, "rt5659", rt5659);
-		if (ret)
+		if (!ret)
+			rt5659->irq_acquired = true;
+		else
 			dev_err(&i2c->dev, "Failed to request IRQ: %d\n", ret);
 
 		/* Enable IRQ output for GPIO1 pin any way */
diff --git a/sound/soc/codecs/rt5659.h b/sound/soc/codecs/rt5659.h
index b49fd8baf4e7e..4df7d7dd99e16 100644
--- a/sound/soc/codecs/rt5659.h
+++ b/sound/soc/codecs/rt5659.h
@@ -1813,6 +1813,8 @@ struct rt5659_priv {
 	int jack_type;
 	bool hda_hp_plugged;
 	bool hda_mic_plugged;
+	bool irq_acquired;
+	bool irq_disabled;
 };
 
 int rt5659_set_jack_detect(struct snd_soc_component *component,
-- 
2.47.3