diff --git a/target/linux/xburst/files-2.6.32/sound/soc/jz4740/jz4740-pcm.c b/target/linux/xburst/files-2.6.32/sound/soc/jz4740/jz4740-pcm.c
index c71c5b48b5..4a4de195a8 100644
--- a/target/linux/xburst/files-2.6.32/sound/soc/jz4740/jz4740-pcm.c
+++ b/target/linux/xburst/files-2.6.32/sound/soc/jz4740/jz4740-pcm.c
@@ -105,10 +105,11 @@ static int jz4740_pcm_hw_params(struct snd_pcm_substream *substream,
 	struct jz4740_pcm_config *config;
 
 	config = rtd->dai->cpu_dai->dma_data;
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		prtd->dma = jz4740_dma_request(substream, "PCM Playback");
-	} else {
-		prtd->dma = jz4740_dma_request(substream, "PCM Capture");
+	if (!prtd->dma) {
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			prtd->dma = jz4740_dma_request(substream, "PCM Playback");
+		else
+			prtd->dma = jz4740_dma_request(substream, "PCM Capture");
 	}
 
 	if (!prtd->dma)