ral_dma_region_alloc
err = ral_dma_region_alloc(sc, &ring->dr_desc,
err = ral_dma_region_alloc(sc, &ring->dr_txbuf[i], size,
err = ral_dma_region_alloc(sc, &ring->dr_desc,
err = ral_dma_region_alloc(sc, &ring->dr_rxbuf[i], size,