On Tue, 16 Apr 2019 20:38:35 +0200 Christian König wrote:
> @ -331,14 +282,19 @@ EXPORT_SYMBOL(drm_gem_map_dma_buf);
> * @sgt: scatterlist info of the buffer to unmap
> * @dir: direction of DMA transfer
> *
> - * Not implemented. The unmap is done at drm_gem_map_detach(). This can be
> - * used as the &dma_buf_ops.unmap_dma_buf callback.
> + * This can be used as the &dma_buf_ops.unmap_dma_buf callback.
> */
> void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
> struct sg_table *sgt,
> enum dma_data_direction dir)
> {
> - /* nothing to be done here */
> + if (!sgt)
if (WARN_ON(!sgt)) ?
> + return;
> +
> + dma_unmap_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
> + DMA_ATTR_SKIP_CPU_SYNC);
> + sg_free_table(sgt);
> + kfree(sgt);
> }
> EXPORT_SYMBOL(drm_gem_unmap_dma_buf);
>
> --
> 2.17.1
>
BR
Hillf
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