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ASoC: hda: fix unbalanced codec dev refcount for HDA_DEV_ASOC 

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@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ranjani Sridharan 2019-05-31 09:01:37 -07:00 committed by Mark Brown
parent 347d1c4b07
commit d6947bb234
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1 changed files with 8 additions and 1 deletions
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9
sound/pci/hda/hda_codec.c
View File

@ -834,7 +834,14 @@ static int snd_hda_codec_dev_free(struct snd_device *device)
codec->in_freeing = 1;
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;
}