Name
snd_pcm_lib_alloc_vmalloc_buffer —
allocate virtual DMA buffer
Synopsis
int snd_pcm_lib_alloc_vmalloc_buffer ( | struct snd_pcm_substream * substream, |
| | size_t size); |
Arguments
substream
the substream to allocate the buffer to
size
the requested buffer size, in bytes
Description
Allocates the PCM substream buffer using vmalloc, i.e., the memory is
contiguous in kernel virtual space, but not in physical memory. Use this
if the buffer is accessed by kernel code but not by device DMA.
Returns 1 if the buffer was changed, 0 if not changed, or a negative error
code.