NAME
snd_pcm_lib_free_pages - release the allocated DMA buffer.
SYNOPSIS
int snd_pcm_lib_free_pages (snd_pcm_substream_t * substream);
ARGUMENTS
substream
the substream to release the DMA buffer
DESCRIPTION
Releases the DMA buffer allocated via snd_pcm_lib_malloc_pages.
Returns zero if successful, or a negative error code on failure.