[alsa-devel] pcm_oss: Can period_bytes - buffer_used be less than 0?

vi sound/core/oss/pcm_oss.c +1572 (in linus' git tree) and note:

static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file) { ... size_t size; ... :1608 size = runtime->oss.period_bytes - runtime->oss.period_ptr;

can this period_bytes - buffer_used become less than 0?

Roel