mcam_dma_desc
ndesc * sizeof(struct mcam_dma_desc),
struct mcam_dma_desc *desc = mvb->dma_desc;
dma_free_coherent(cam->dev, ndesc * sizeof(struct mcam_dma_desc),
struct mcam_dma_desc *dma_desc; /* Descriptor virtual address */
sg_table->nents * sizeof(struct mcam_dma_desc));