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Index: linux-2.6.21/sound/soc/pxa/pxa2xx-pcm.c
===================================================================
--- linux-2.6.21.orig/sound/soc/pxa/pxa2xx-pcm.c 2007-09-02 22:30:56.000000000 -0300
+++ linux-2.6.21/sound/soc/pxa/pxa2xx-pcm.c 2007-09-02 22:36:26.000000000 -0300
@@ -153,7 +153,8 @@
static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
{
struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
-
+ /* no dma if on loopback */
+ if (!prtd->params) return 0;
DCSR(prtd->dma_ch) &= ~DCSR_RUN;
DCSR(prtd->dma_ch) = 0;
DCMD(prtd->dma_ch) = 0;
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