Pre-allocation for the given dma type
int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream * substream, int type, struct device * data, size_t size, size_t max);
substream
the pcm substream instance
type
DMA type (SNDRV_DMA_TYPE_*)
data
DMA type dependent data
size
the requested pre-allocation size in bytes
max
the max. allowed pre-allocation size
Do pre-allocation for the given DMA buffer type.
Zero if successful, or a negative error code on failure.