Man page 9 : snd_dma_alloc_pages_fallback

snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback

int snd_dma_alloc_pages_fallback(int  type , struct device *  device , size_t  size , struct snd_dma_buffer *  dmab );

type
    the DMA buffer type

device
    the device pointer

size
    the buffer size to allocate

dmab
    buffer allocation record to store the allocated data

Calls the memory-allocator function for the corresponding buffer type. When no space is left, this function reduces the size and tries to allocate again. The size actually allocated is stored in res_size argument.

Zero if the buffer with the given size is allocated successfully, otherwise a negative value on error.