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

[Zhu Lingshan]

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....@intel.com>
---
 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