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ALSA: pcm: Avoid mmap warnings on x86

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On x86, using dma_mmap_coherent() for the pages allocated via
dma_alloc_coherent() results in a warning like:
  aplay:32536 map pfn RAM range req uncached-minus for [mem 0x21d500000-0x21d51ffff], got write-back

Until the issue is addressed in the core side, take back to the old
good way in PCM code only for x86.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2014-10-24 12:36:23 +02:00
parent 8057727087
commit 49d776ffb5
1 changed files with 2 additions and 0 deletions
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2
sound/core/pcm_native.c
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@ -3326,6 +3326,7 @@ int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
area->vm_end - area->vm_start, area->vm_page_prot);
}
#endif /* CONFIG_GENERIC_ALLOCATOR */
#ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
if (!substream->ops->page &&
substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
return dma_mmap_coherent(substream->dma_buffer.dev.dev,
@ -3333,6 +3334,7 @@ int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
substream->runtime->dma_area,
substream->runtime->dma_addr,
area->vm_end - area->vm_start);
#endif /* CONFIG_X86 */
/* mmap with fault handler */
area->vm_ops = &snd_pcm_vm_ops_data_fault;
return 0;