[PATCH 6.6.y 2/2] ASoC: hdac_hda: Restore the codec device type on unbind

[Sasha Levin <sashal@kernel.org>]

From: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

[ Upstream commit 08a44bde821d4fe22c0b6e63da04b3c59ac243a8 ]

hdac_hda_codec_probe() changes the type of the codec device to
HDA_DEV_ASOC to prevent snd_hda_codec_unregister() from unregistering
the device when the card is freed.

The type is never restored, and hda_bus_match() requires the device and
driver types to be equal. After unbinding the codec driver via sysfs the
HDA_DEV_LEGACY codec drivers no longer match the device and bind fails
with -ENODEV.

Restore HDA_DEV_LEGACY with a device managed action registered before
the component, so it runs after the component and the card are gone.

Fixes: b60ee2e281b6 ("ASoC: hdac_hda: overwrite hdev type to HDA_DEV_ASOC")
Cc: stable@vger.kernel.org
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://patch.msgid.link/20261027083840.28813-3-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/soc/codecs/hdac_hda.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sound/soc/codecs/hdac_hda.c b/sound/soc/codecs/hdac_hda.c
index 5a196a756aaf4..d39f93aefcbf3 100644
--- a/sound/soc/codecs/hdac_hda.c
+++ b/sound/soc/codecs/hdac_hda.c
@@ -604,6 +604,13 @@ static const struct snd_soc_component_driver hdac_hda_hdmi_codec = {
 	.endianness		= 1,
 };
 
+static void hdac_hda_restore_dev_type(void *data)
+{
+	struct hdac_device *hdev = data;
+
+	hdev->type = HDA_DEV_LEGACY;
+}
+
 static int hdac_hda_dev_probe(struct hdac_device *hdev)
 {
 	struct hdac_hda_priv *hda_pvt;
@@ -620,6 +627,11 @@ static int hdac_hda_dev_probe(struct hdac_device *hdev)
 		hda_pvt->need_display_power = true;
 	dev_set_drvdata(&hdev->dev, hda_pvt);
 
+	/* Allow the legacy codec driver to match again after unbind */
+	ret = devm_add_action(&hdev->dev, hdac_hda_restore_dev_type, hdev);
+	if (ret)
+		return ret;
+
 	/* hold the ref while we probe */
 	hlink = snd_hdac_ext_bus_get_hlink_by_name(hdev->bus, dev_name(&hdev->dev));
 	if (!hlink) {
-- 
2.53.0