myrb_bgi_status
struct myrb_bgi_status *bgi, *last_bgi;
bgi = dma_alloc_coherent(&cb->pdev->dev, sizeof(struct myrb_bgi_status),
memcpy(&cb->bgi_status, bgi, sizeof(struct myrb_bgi_status));
dma_free_coherent(&cb->pdev->dev, sizeof(struct myrb_bgi_status),
struct myrb_bgi_status bgi_status;