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@suse.de --- 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);