The bug is a double call to dma_free_writecombine to dma_desc_array buffer. the
happens when soc_pcm_open fails on asoc: AC97 <-> pxa2xx-lfe-ac97 No matching
rates.
the dma buffer above get freed first time in the same function at
codec_dai_err:
if (platform->pcm_ops->close)
platform->pcm_ops->close(substream);
The second time is when snd_pcm_open_substream fails and calls
snd_pcm_release_substream.
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Unable to handle kernel NULL pointer dereference at virtual address 00000002
https://bugs.launchpad.net/bugs/530404
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