[PATCH 3/4] vdpa: get_iova_range() is mandatory for device specific DMA translation

[Jason Wang]

In order to let userspace work correctly, get_iova_range() is a must
for the device that has its own DMA translation logic.

Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
 drivers/vdpa/vdpa.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index de211ef3738c..ab7af978ef70 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -82,6 +82,10 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent,
 	if (!!config->dma_map != !!config->dma_unmap)
 		goto err;
 
+	if ((config->dma_map || config->set_map) &&
+	    !config->get_iova_range)
+		goto err;
+
 	err = -ENOMEM;
 	vdev = kzalloc(size, GFP_KERNEL);
 	if (!vdev)
-- 
2.20.1