snd_dma_buffer_mmap
int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
EXPORT_SYMBOL(snd_dma_buffer_mmap);
!snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
return snd_dma_buffer_mmap(dmab, vma);