[Linaro-mm-sig] Re: Fwd: [PATCH 4/4] vfio/pci: Allow MMIO regions to be exported through dma-buf

On Sun, Aug 21, 2022 at 04:51:34PM +0300, Oded Gabbay wrote:

...

+static void vfio_pci_dma_buf_unmap(struct dma_buf_attachment *attachment,

•                              struct sg_table *sgt,
  

•                              enum dma_data_direction dir)
  

+{

•   struct vfio_pci_dma_buf *priv = attachment->dmabuf->priv;
  

•   dma_unmap_resource(attachment->dev, sg_dma_address(sgt->sgl),
  

•                      priv->dmabuf->size, dir, DMA_ATTR_SKIP_CPU_SYNC);
  

•   sg_free_table(sgt);
  

Before calling sg_free_table(), you need to restore the orig_nents as it is used in that function to free the allocated memory of the sgt.

Oops, right, thanks good catch

Jason