On Mon, 25 Jun 2018 08:44:52 +0200
Gerd Hoffmann <kra...@redhat.com> wrote:
> There is no default implementation for dma_buf_ops->unmap.
> So add a function unmapping the page, otherwise we'll leak them.
>
> Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
> ---
> samples/vfio-mdev/mbochs.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
> index aa25cda21d..85ac603769 100644
> --- a/samples/vfio-mdev/mbochs.c
> +++ b/samples/vfio-mdev/mbochs.c
> @@ -811,11 +811,18 @@ static void *mbochs_kmap_dmabuf(struct dma_buf *buf,
> unsigned long page_num)
> return kmap(page);
> }
>
> +static void mbochs_kunmap_dmabuf(struct dma_buf *buf, unsigned long page_num,
> + void *vaddr)
> +{
> + kunmap(vaddr);
> +}
> +
> static struct dma_buf_ops mbochs_dmabuf_ops = {
> .map_dma_buf = mbochs_map_dmabuf,
> .unmap_dma_buf = mbochs_unmap_dmabuf,
> .release = mbochs_release_dmabuf,
> .map = mbochs_kmap_dmabuf,
> + .unmap = mbochs_kunmap_dmabuf,
> .mmap = mbochs_mmap_dmabuf,
> };
>
Is this a fix for v4.18? AFAICT, the kmap_atomic removal is only in
next, not yet upstream and hopefully includes this sample driver before
hitting mainline. Should we therefore have a v4.18-rc based patch for
this to include before v4.18 to resolve this? Thanks,
Alex
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