DMA_BUF_BEGIN_CPU_AC(9)           Device drivers infrastructure           DMA_BUF_BEGIN_CPU_AC(9)



NAME
       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.

SYNOPSIS
       int dma_buf_begin_cpu_access(struct dma_buf * dmabuf, enum dma_data_direction direction);

ARGUMENTS
       dmabuf
           [in] buffer to prepare cpu access for.

       direction
           [in] length of range for cpu access.

DESCRIPTION
       Can return negative error values, returns 0 on success.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   DMA_BUF_BEGIN_CPU_AC(9)