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SND_PCM_LIB_PREALLOC(9)		    PCM API	       SND_PCM_LIB_PREALLOC(9)

NAME
       snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type

SYNOPSIS
       int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream * substream,
					 int type, struct device * data,
					 size_t size, size_t max);

ARGUMENTS
       substream
	   the pcm substream instance

       type
	   DMA type (SNDRV_DMA_TYPE_*)

       data
	   DMA type dependant data

       size
	   the requested pre-allocation size in bytes

       max
	   the max. allowed pre-allocation size

DESCRIPTION
       Do pre-allocation for the given DMA buffer type.

       When substream->dma_buf_id is set, the function tries to look for the
       reserved buffer, and the buffer is not freed but reserved at
       destruction time. The dma_buf_id must be unique for all systems (in the
       same DMA buffer type) e.g. using snd_dma_pci_buf_id.

       Returns zero if successful, or a negative error code on failure.

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013	       SND_PCM_LIB_PREALLOC(9)

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