From 6ab08ced64a4d5ea321fd1d5ebbd2217789b040f Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Fri, 10 Jan 2014 13:01:41 +0100 Subject: [PATCH] ALSA: PCM: Warn when buffer preallocation fails The failures of buffer preallocations at driver initializations aren't critical but it's still helpful to inform, so that user can know that something doesn't work as expected. For example, the recent page allocator change triggered regressions, but developers didn't notice until recently because the driver didn't complain. Signed-off-by: Takashi Iwai --- sound/core/pcm_memory.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c index 01f8eaf..54debc0 100644 --- a/sound/core/pcm_memory.c +++ b/sound/core/pcm_memory.c @@ -51,6 +51,7 @@ static const size_t snd_minimum_buffer = 16384; static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t size) { struct snd_dma_buffer *dmab = &substream->dma_buffer; + size_t orig_size = size; int err; do { @@ -63,6 +64,10 @@ static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t siz size >>= 1; } while (size >= snd_minimum_buffer); dmab->bytes = 0; /* tell error */ + pr_warn("ALSA pcmC%dD%d%c,%d:%s: cannot preallocate for size %zu\n", + substream->pcm->card->number, substream->pcm->device, + substream->stream ? 'c' : 'p', substream->number, + substream->pcm->name, orig_size); return 0; } -- 2.7.4