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| author | Takashi Iwai <tiwai@suse.de> | 2021-08-08 10:01:16 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-08-09 08:52:31 +0300 |
| commit | dc0dc8a73e8e4dc33fba93dfe23356cc5a500c57 (patch) | |
| tree | 4c0c7a98a67476e0f81dcee18a0bbf5c146a5177 /sound | |
| parent | 739d0959fbed23838a96c48fbce01dd2f6fb2c5f (diff) | |
| download | linux-dc0dc8a73e8e4dc33fba93dfe23356cc5a500c57.tar.xz | |
ALSA: pcm: Fix mmap breakage without explicit buffer setup
The recent fix c4824ae7db41 ("ALSA: pcm: Fix mmap capability check")
restricts the mmap capability only to the drivers that properly set up
the buffers, but it caused a regression for a few drivers that manage
the buffer on its own way.
For those with UNKNOWN buffer type (i.e. the uninitialized / unused
substream->dma_buffer), just assume that the driver handles the mmap
properly and blindly trust the hardware info bit.
Fixes: c4824ae7db41 ("ALSA: pcm: Fix mmap capability check")
Reported-and-tested-by: Jeff Woods <jwoods@fnordco.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/s5him0gpghv.wl-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/core/pcm_native.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index 09c0e2a6489c..71323d807dbf 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -251,7 +251,10 @@ static bool hw_support_mmap(struct snd_pcm_substream *substream) switch (substream->dma_buffer.dev.type) { case SNDRV_DMA_TYPE_UNKNOWN: - return false; + /* we can't know the device, so just assume that the driver does + * everything right + */ + return true; case SNDRV_DMA_TYPE_CONTINUOUS: case SNDRV_DMA_TYPE_VMALLOC: return true; |