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Diffstat (limited to 'sound/soc/s3c24xx/s3c24xx-pcm.c')
-rw-r--r--sound/soc/s3c24xx/s3c24xx-pcm.c22
1 files changed, 13 insertions, 9 deletions
diff --git a/sound/soc/s3c24xx/s3c24xx-pcm.c b/sound/soc/s3c24xx/s3c24xx-pcm.c
index bfbdc3cbd43..4107a87d4de 100644
--- a/sound/soc/s3c24xx/s3c24xx-pcm.c
+++ b/sound/soc/s3c24xx/s3c24xx-pcm.c
@@ -158,18 +158,22 @@ static int s3c24xx_pcm_hw_params(struct snd_pcm_substream *substream,
if (!dma)
return 0;
- /* prepare DMA */
- prtd->params = dma;
+ /* this may get called several times by oss emulation
+ * with different params -HW */
+ if (prtd->params == NULL) {
+ /* prepare DMA */
+ prtd->params = dma;
- DBG("params %p, client %p, channel %d\n", prtd->params,
- prtd->params->client, prtd->params->channel);
+ DBG("params %p, client %p, channel %d\n", prtd->params,
+ prtd->params->client, prtd->params->channel);
- ret = s3c2410_dma_request(prtd->params->channel,
- prtd->params->client, NULL);
+ ret = s3c2410_dma_request(prtd->params->channel,
+ prtd->params->client, NULL);
- if (ret) {
- DBG(KERN_ERR "failed to get dma channel\n");
- return ret;
+ if (ret) {
+ DBG(KERN_ERR "failed to get dma channel\n");
+ return ret;
+ }
}
/* channel needs configuring for mem=>device, increment memory addr,