[alsa-devel] [PATCH] Fix codec_dai->ops NULL pointer bug for AC97 codec dai in soc-core

Mark Brown broonie at opensource.wolfsonmicro.com
Fri Oct 16 11:08:41 CEST 2009

On Fri, Oct 16, 2009 at 10:09:20AM +0800, Barry Song wrote:
> AC97 codec DAIs don't register themselves eg.stac9766, wm9712, wm9713, wm9705.c, ad1980,
> then it loses to the chance to be given a null_dai_ops in snd_soc_register_dai if they
> have no ops. When functions like soc_pcm_open, soc_pcm_hw_params etc. access the ops field
> in these DAIs, panic will happen.

This is the wrong fix - null DAI ops are supposed to be supported for
all devices since not all DAIs will be configurable.

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