PASS_MAX_SEGS
bus_dma_segment_t user_segs[PASS_MAX_SEGS];
bus_dma_segment_t kern_segs[PASS_MAX_SEGS];
if (num_segs > PASS_MAX_SEGS) {
if (num_segs_needed > PASS_MAX_SEGS) {
if (num_segs > PASS_MAX_SEGS) {