Add the device to dma_bufs attachments list; optionally, calls attach of dma_buf_ops to allow device-specific attach functionality
struct dma_buf_attachment * dma_buf_attach(struct dma_buf * dmabuf, struct device * dev);
dmabuf
[in] buffer to attach device to.
dev
[in] device to be attached.
Returns struct dma_buf_attachment * for this attachment; returns ERR_PTR on error.