[PATCH] ASoC: rt5659: fix teardown order and stale state across card rebind

[Tristan Madani <tristmd@gmail.com>]

From: Tristan Madani <tristan@talencesecurity.com>

The cleanup in rt5659_remove() does not reset hs_jack, jack_type, or
the component pointer, and does not mark the regmap cache dirty after
the codec reset.  On card rebind this leaves a dangling hs_jack pointer
and causes regmap_update_bits() to skip re-programming jack-detection
registers because the cache still holds the pre-reset values.

Additionally, headset detection registers from a previous session
remain cached after the hardware reset.  regcache_sync() on rebind
restores this stale state, which can leave the SAR source on button
mode or HDA plug flags in an incorrect state.  Clear the headset
state by calling rt5659_headset_detect(component, 0) before the
codec reset, and reset the HDA header plug tracking flags.

If the I2C device unbinds without a card bound, rt5659_remove() is
never called and the IRQ keeps queuing jack_detect_work until devres
frees the private data.  Register a devm action to disable the IRQ
and cancel the delayed work on any I2C teardown path.  Guard
disable_irq() in rt5659_i2c_shutdown() with the irq_disabled flag
to avoid an unbalanced disable when rt5659_remove() already ran.

Store the I2C client pointer in rt5659_priv so all paths can
reference it directly.

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 | 39 ++++++++++++++++++++++++++++++++++++---
 sound/soc/codecs/rt5659.h |  1 +
 2 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/rt5659.c b/sound/soc/codecs/rt5659.c
index 68f7d5673e190..14111f40384e5 100644
--- a/sound/soc/codecs/rt5659.c
+++ b/sound/soc/codecs/rt5659.c
@@ -3660,6 +3660,16 @@ static int rt5659_set_bias_level(struct snd_soc_component *component,
 	return 0;
 }
 
+static void rt5659_i2c_disable_irq_and_cancel_work(void *data)
+{
+	struct rt5659_priv *rt5659 = data;
+
+	if (rt5659->irq_acquired && !rt5659->irq_disabled)
+		disable_irq(rt5659->i2c->irq);
+	if (rt5659->jack_detect_work_inited)
+		cancel_delayed_work_sync(&rt5659->jack_detect_work);
+}
+
 static int rt5659_probe(struct snd_soc_component *component)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_component_to_dapm(component);
@@ -3667,8 +3677,10 @@ static int rt5659_probe(struct snd_soc_component *component)
 
 	rt5659->component = component;
 
+	regcache_sync(rt5659->regmap);
+
 	if (rt5659->irq_disabled) {
-		enable_irq(to_i2c_client(component->dev)->irq);
+		enable_irq(rt5659->i2c->irq);
 		rt5659->irq_disabled = false;
 	}
 
@@ -3689,17 +3701,26 @@ 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);
+		disable_irq(rt5659->i2c->irq);
 		rt5659->irq_disabled = true;
 	}
 
 	if (rt5659->jack_detect_work_inited)
 		cancel_delayed_work_sync(&rt5659->jack_detect_work);
 
+	if (rt5659->jack_type)
+		rt5659_headset_detect(component, 0);
+
+	rt5659->hs_jack = NULL;
+	rt5659->jack_type = 0;
+	rt5659->hda_hp_plugged = false;
+	rt5659->hda_mic_plugged = false;
+	rt5659->component = NULL;
+
 	regmap_write(rt5659->regmap, RT5659_RESET, 0);
+	regcache_mark_dirty(rt5659->regmap);
 }
 
 #ifdef CONFIG_PM
@@ -4328,6 +4349,13 @@ static int rt5659_i2c_probe(struct i2c_client *i2c)
 				   RT5659_GP1_PIN_MASK, RT5659_GP1_PIN_IRQ);
 	}
 
+	rt5659->i2c = i2c;
+	ret = devm_add_action_or_reset(&i2c->dev,
+				      rt5659_i2c_disable_irq_and_cancel_work,
+				      rt5659);
+	if (ret)
+		return ret;
+
 	return devm_snd_soc_register_component(&i2c->dev,
 			&soc_component_dev_rt5659,
 			rt5659_dai, ARRAY_SIZE(rt5659_dai));
@@ -4337,6 +4365,11 @@ static void rt5659_i2c_shutdown(struct i2c_client *client)
 {
 	struct rt5659_priv *rt5659 = i2c_get_clientdata(client);
 
+	if (rt5659->irq_acquired && !rt5659->irq_disabled)
+		disable_irq(client->irq);
+	if (rt5659->jack_detect_work_inited)
+		cancel_delayed_work_sync(&rt5659->jack_detect_work);
+
 	regmap_write(rt5659->regmap, RT5659_RESET, 0);
 }
 
diff --git a/sound/soc/codecs/rt5659.h b/sound/soc/codecs/rt5659.h
index e10b3844501b9..1118e6ab1887d 100644
--- a/sound/soc/codecs/rt5659.h
+++ b/sound/soc/codecs/rt5659.h
@@ -1793,6 +1793,7 @@ struct rt5659_priv {
 	struct snd_soc_component *component;
 	struct rt5659_platform_data pdata;
 	struct regmap *regmap;
+	struct i2c_client *i2c;
 	struct gpio_desc *gpiod_ldo1_en;
 	struct gpio_desc *gpiod_reset;
 	struct snd_soc_jack *hs_jack;
-- 
2.47.3