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.
|struct dma_buf * dmabuf,|
|enum dma_data_direction direction|
[in] buffer to prepare cpu access for.
[in] length of range for cpu access.