void b43_dma_rx(struct b43_dmaring *ring)
{
	const struct b43_dma_ops *ops = ring->ops;
	int slot, current_slot;
	int used_slots = 0;

	B43_WARN_ON(ring->tx);
	current_slot = ops->get_current_rxslot(ring);
	B43_WARN_ON(!(current_slot >= 0 && current_slot < ring->nr_slots));

	slot = ring->current_slot;
	for (; slot != current_slot; slot = next_slot(ring, slot)) {
		dma_rx(ring, &slot);
		update_max_used_slots(ring, ++used_slots);
	}
	ops->set_current_rxslot(ring, slot);
	ring->current_slot = slot;
}
void b43_dma_rx(struct b43_dmaring *ring)
{
	const struct b43_dma_ops *ops = ring->ops;
	int slot, current_slot;
	int used_slots = 0;

	B43_WARN_ON(ring->tx);
	current_slot = ops->get_current_rxslot(ring);
	B43_WARN_ON(!(current_slot >= 0 && current_slot < ring->nr_slots));

	slot = ring->current_slot;
	for (; slot != current_slot; slot = next_slot(ring, slot)) {
		dma_rx(ring, &slot);
		update_max_used_slots(ring, ++used_slots);
	}
	ops->set_current_rxslot(ring, slot);
	ring->current_slot = slot;
}