[PATCH 1/2] vDPA: get_vq_irq() should be optional

[Zhu Lingshan <lingshan.zhu@xxxxxxxxx>]

get_vq_irq() should be optional, it's required when
we need to setup irq offloading, otherwise it‘s OK to be NULL.

Signed-off-by: Zhu Lingshan <lingshan.zhu@xxxxxxxxx>
---
 include/linux/vdpa.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 03aa9f77f192..56c6a03db43b 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -87,7 +87,8 @@ struct vdpa_device {
  *				@vdev: vdpa device
  *				@idx: virtqueue index
  *				Returns the notifcation area
- * @get_vq_irq:			Get the irq number of a virtqueue
+ * @get_vq_irq:			Get the irq number of a virtqueue (optional,
+ *				but must implemented if require vq irq offloading)
  *				@vdev: vdpa device
  *				@idx: virtqueue index
  *				Returns int: irq number of a virtqueue,
-- 
2.18.4