272 	return (ring->nr_slots - ring->used_slots);  in free_slots()
323 	ring->used_slots++;  in request_slot()
325 	update_max_used_slots(ring, ring->used_slots);  in request_slot()
666 	ring->used_slots = ring->nr_slots;  in alloc_initial_descbuffers()
792 	if (!ring->used_slots)  in free_all_descbuffers()
1272 	old_used_slots = ring->used_slots;  in dma_tx_fragment()
1285 		ring->used_slots = old_used_slots;  in dma_tx_fragment()
1293 		ring->used_slots = old_used_slots;  in dma_tx_fragment()
1315 			ring->used_slots = old_used_slots;  in dma_tx_fragment()
1325 			ring->used_slots = old_used_slots;  in dma_tx_fragment()
1497 	firstused = ring->current_slot - ring->used_slots + 1;  in b43_dma_handle_txstatus()
1612 		ring->used_slots--;  in b43_dma_handle_txstatus()
1751 	int used_slots = 0;  in b43_dma_rx()  local
1760 		update_max_used_slots(ring, ++used_slots);  in b43_dma_rx()