Use u16 for last_used_idx in virtqueue_poll_split() to align with the
spec.

Acked-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 drivers/virtio/virtio_ring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 27d1239705bd..103e807249b6 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -801,7 +801,7 @@ static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head,
 }
 
 static bool virtqueue_poll_split(const struct vring_virtqueue *vq,
-				 unsigned int last_used_idx)
+				 u16 last_used_idx)
 {
 	return (u16)last_used_idx != virtio16_to_cpu(vq->vq.vdev,
 			vq->split.vring.used->idx);
-- 
2.39.5