struct snd_pcm_hw_params *params)
 {
        struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
-       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+       struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
        struct snd_dmaengine_dai_dma_data *dma_params;
        struct dma_slave_config config;
        int ret;
 
 int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
 {
-       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+       struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_dmaengine_dai_dma_data *dma_params;
        int ret;