snd_pcm_lib_preallocate_free  966 include/sound/pcm.h int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
snd_pcm_lib_preallocate_free  124 sound/core/pcm_memory.c 			snd_pcm_lib_preallocate_free(substream);