[alsa-devel] Buffer memory does not get allocated?

I am allocating memory for the buffers in my init call by doing: snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, snd_dma_continuous_data(GFP_KERNEL), 256*1024, 256*1024);

in my hw_params call I have: ret= snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));

here is the output from my hw_params call:

called snd_pcm_lib_malloc_pages return=1 params_buffer_bytes(hw_params)=32768

Size of DMA area=32768

Buffer size in bytes=262144

Buffer virt address=9dc00000

Buffer phys address=0

Now I am not sure why is my buffer size bigger than my DMA area. I assume that memory is not linear because of that and that is why I do not have phys address to the buffer. How do I fix this?

Thanx Ogi