[alsa-devel] [PATCH] ASoC AC97 device reg bugfix

[Liam Girdwood]

This patch fixes a bug whereby AC97 bus device data was being clobbered
when AC97 codecs using the generic ac97_codec.c driver were being
registered. Codecs that didn't use the generic driver were unaffected
(e.g. WM9712, WM9713).

Changes:-

 o Add new AC97 codec class for custom (or need bus dev registration)
AC97 codecs.
 o Only register/deregister this custom codec device with the AC97 bus.
The generic AC97 driver already does this for generic codec devices.

This may be related to bug #3038 :-
 
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3038

Manuel, can you try this on SH & Au1x00.

Thanks

Liam
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