playback_copy_ack 384 sound/isa/gus/gus_pcm.c return playback_copy_ack(substream, bpos, len); playback_copy_ack 400 sound/isa/gus/gus_pcm.c return playback_copy_ack(substream, bpos, len); playback_copy_ack 417 sound/isa/gus/gus_pcm.c return playback_copy_ack(substream, bpos, len);