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ALSA: pcm: Fix mmap capability check 

The hw_support_mmap() doesn't cover all memory allocation types and
might use a wrong device pointer for checking the capability.
Check the all memory allocation types more completely.

Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210720092640.12338-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2021-07-20 11:26:40 +02:00
parent 114613f62f
commit c4824ae7db
1 changed files with 10 additions and 4 deletions
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14
sound/core/pcm_native.c
View File

@ -246,12 +246,18 @@ static bool hw_support_mmap(struct snd_pcm_substream *substream)
if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
return false;
if (substream->ops->mmap ||
(substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV &&
substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC))
if (substream->ops->mmap)
return true;
return dma_can_mmap(substream->dma_buffer.dev.dev);
switch (substream->dma_buffer.dev.type) {
case SNDRV_DMA_TYPE_UNKNOWN:
return false;
case SNDRV_DMA_TYPE_CONTINUOUS:
case SNDRV_DMA_TYPE_VMALLOC:
return true;
default:
return dma_can_mmap(substream->dma_buffer.dev.dev);
}
}
static int constrain_mask_params(struct snd_pcm_substream *substream,