ALSA: Restore support for DMAless DAIs on PXA

Used for applications such as direct bluetooth connections on smartphones which don't go via the CPU. This used to be supported before the refactoring to share code but this check was removed during that move. Signed-off-by: Mark Brown <[email protected]>
chewitt · Aug 19, 2009 · f8bae4c · f8bae4c
1 parent 474e09c
commit f8bae4c
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/sound/arm/pxa2xx-pcm-lib.c b/sound/arm/pxa2xx-pcm-lib.c
@@ -136,6 +136,9 @@ int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
 {
 	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
 
+	if (!prtd || !prtd->params)
+		return 0;
+
 	DCSR(prtd->dma_ch) &= ~DCSR_RUN;
 	DCSR(prtd->dma_ch) = 0;
 	DCMD(prtd->dma_ch) = 0;