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.
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
sound/core/pcm_memory.c | 2 ++
1 file changed, 2 insertions(+)
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);
--
2.16.4
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