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ALSA: pcm: Create proc files only for non-empty preallocations 

It makes little sense to create prealloc proc files for streams that
have the zero max size, which is a typical case for vmalloc buffers.
Skip the proc file creations to save resources in such a case.

Link: https://lore.kernel.org/r/20191105191007.18150-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2019-11-05 20:10:07 +01:00
parent a55eaf177a
commit d39789912f
1 changed files with 2 additions and 1 deletions
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3
sound/core/pcm_memory.c
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@ -203,7 +203,8 @@ static void snd_pcm_lib_preallocate_pages1(struct snd_pcm_substream *substream,
if (substream->dma_buffer.bytes > 0)
substream->buffer_bytes_max = substream->dma_buffer.bytes;
substream->dma_max = max;
preallocate_info_init(substream);
if (max > 0)
preallocate_info_init(substream);
}