dma_buf_poll_cb_t
struct dma_buf_poll_cb_t *dcb = (struct dma_buf_poll_cb_t *)cb;
struct dma_buf_poll_cb_t *dcb)
struct dma_buf_poll_cb_t *dcb = &dmabuf->cb_out;
struct dma_buf_poll_cb_t *dcb = &dmabuf->cb_in;