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ALSA: pcm: Fix missing check of the new non-cached buffer type
The check for the mmap support via hw_support_mmap() function misses the case where the device is with SNDRV_DMA_TYPE_DEV_UC, which should have been treated equally as SNDRV_DMA_TYPE_DEV. Let's fix it. Note that this bug doesn't hit any practical problem, because SNDRV_DMA_TYPE_DEV_UC is used only for x86-specific drivers (snd-hda-intel and snd-intel8x0) for the specific platforms that need the non-cached buffers. And, on such platforms, hw_support_mmap() already returns true in anyway. That's the reason I didn't put Cc-to-stable mark here. This is only for any theoretical future extension. Fixes:425da15970
("ALSA: pcm: use dma_can_mmap() to check if a device supports dma_mmap_*") Fixes:42e748a0b3
("ALSA: memalloc: Add non-cached buffer type") Link: https://lore.kernel.org/r/20191104101115.27311-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -222,7 +222,8 @@ static bool hw_support_mmap(struct snd_pcm_substream *substream)
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return false;
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return false;
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if (substream->ops->mmap ||
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if (substream->ops->mmap ||
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substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV)
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(substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV &&
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substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC))
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return true;
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return true;
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return dma_can_mmap(substream->dma_buffer.dev.dev);
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return dma_can_mmap(substream->dma_buffer.dev.dev);
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