    void sync_descbuffer_for_device(struct b43_dmaring *ring,
				    dma_addr_t addr, size_t len)
{
	B43_WARN_ON(ring->tx);
	dma_sync_single_for_device(ring->dev->dev->dma_dev,
				   addr, len, DMA_FROM_DEVICE);
}
    void sync_descbuffer_for_device(struct b43_dmaring *ring,
				    dma_addr_t addr, size_t len)
{
	B43_WARN_ON(ring->tx);
	dma_sync_single_for_device(ring->dev->dev->dma_dev,
				   addr, len, DMA_FROM_DEVICE);
}