[RFC PATCH v1 2/2] dma-buf: add lock callback for fcntl system call

This patch adds lock callback to dma buf file operations, and this callback will be called by fcntl system call. With this patch, fcntl system call can be used for buffer synchronization between CPU and CPU, and CPU and DMA in user mode. Signed-off-by: Inki Dae Signed-off-by: Kyungmin Park ---

[RFC PATCH v1 2/2] dma-buf: add lock callback for fcntl system call.

This patch adds lock callback to dma buf file operations, and this callback will be called by fcntl system call. With this patch, fcntl system call can be used for buffer synchronization between CPU and CPU, and CPU and DMA in user mode. Signed-off-by: Inki Dae Signed-off-by: Kyungmin Park ---