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| author |   Takashi Iwai <tiwai@suse.de> | 2019-11-05 20:10:06 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-11-06 15:43:34 +0100 |
| commit | a55eaf177a36f7789eec0985a7edd00fe7353d90 (patch) | |
| tree | 29ea58d2b200ff97f32f3c3583687cae461b3c95 /sound/core | |
| parent | ALSA: docs: Update documentation about SG- and vmalloc-buffers (diff) | |
| download | linux-dev-a55eaf177a36f7789eec0985a7edd00fe7353d90.tar.xz linux-dev-a55eaf177a36f7789eec0985a7edd00fe7353d90.zip | |
ALSA: pcm: Warn if doubly preallocated
Warn if snd_pcm_lib_preallocate_pages*() is applied to the stream that
has already the preallocated buffers and skip the allocation. It's a
clearly a driver bug.
Link: https://lore.kernel.org/r/20191105191007.18150-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
| -rw-r--r-- | sound/core/pcm_memory.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c index 7600dcdf5fd4..19407f79b638 100644 --- a/sound/core/pcm_memory.c +++ b/sound/core/pcm_memory.c @@ -221,6 +221,8 @@ void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, int type, struct device *data, size_t size, size_t max) { + if (snd_BUG_ON(substream->dma_buffer.dev.type)) + return; substream->dma_buffer.dev.type = type; substream->dma_buffer.dev.dev = data; snd_pcm_lib_preallocate_pages1(substream, size, max); |