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| author | Takashi Iwai <tiwai@suse.de> | 2021-08-08 10:01:16 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-15 15:00:26 +0300 |
| commit | 98c3fa3a9d7a2e405ad5a656793d0117bed00881 (patch) | |
| tree | e9e61cec32afacf42b52966d99b0317821951b94 /sound/core | |
| parent | cc1a4dff23a48a3759b2b024ec62b0f34f200b4d (diff) | |
| download | linux-98c3fa3a9d7a2e405ad5a656793d0117bed00881.tar.xz | |
ALSA: pcm: Fix mmap breakage without explicit buffer setup
commit dc0dc8a73e8e4dc33fba93dfe23356cc5a500c57 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/core')
| -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 b36c8d94d4da..c5ef5182fcf1 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; |