[alsa-devel] [PATCH v2] ASoC: hda: fix unbalanced codec dev refcount for HDA_DEV_ASOC

[Ranjani Sridharan]

HDA_DEV_ASOC type codec device refcounts are managed differently
from HDA_DEV_LEGACY devices. The refcount is released explicitly
in snd_hdac_ext_bus_device_remove() for ASOC type devices.
So, remove the put_device() call in snd_hda_codec_dev_free()
for such devices to make the refcount balanced. This will prevent
the NULL pointer exception when the codec driver is released
after the card is freed.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
---
 sound/pci/hda/hda_codec.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index b20eb7fc83eb..fcdf2cd3783b 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -840,7 +840,14 @@ static int snd_hda_codec_dev_free(struct snd_device *device)
 	if (codec->core.type == HDA_DEV_LEGACY)
 		snd_hdac_device_unregister(&codec->core);
 	codec_display_power(codec, false);
-	put_device(hda_codec_dev(codec));
+
+	/*
+	 * In the case of ASoC HD-audio bus, the device refcount is released in
+	 * snd_hdac_ext_bus_device_remove() explicitly.
+	 */
+	if (codec->core.type == HDA_DEV_LEGACY)
+		put_device(hda_codec_dev(codec));
+
 	return 0;
 }
 
-- 
2.17.1