sample/mdev/mbochs: add mbochs_kunmap_dmabuf

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 <kraxel@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index aa25cda21d22..85ac6037696f 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,
 };