dma_buf_begin_cpu_access — Must be called before accessing a dma_buf from the cpu in the kernel context. Calls begin_cpu_access to allow exporter-specific preparations. Coherency is only guaranteed in the specified range for the specified access direction.
int dma_buf_begin_cpu_access ( | struct dma_buf * dmabuf, |
| size_t start, | |
| size_t len, | |
enum dma_data_direction direction); |