[PATCH RFC] virtio_ring: fix delayed enable cb implementation

[Michael S. Tsirkin]

Fix some signed/assigned mistakes in virtqueue_enable_cb_delayed
by using u16 math all over.

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>

---

I'll put this on my v1 branch as well

@@ -398,7 +397,7 @@ EXPORT_SYMBOL_GPL(virtqueue_enable_cb);
 bool virtqueue_enable_cb_delayed(struct virtqueue *_vq)
 {
 	struct vring_virtqueue *vq = to_vvq(_vq);
-	int bufs;
+	u16 bufs;
 
 	START_USE(vq);
 
@@ -412,7 +411,7 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *_vq)
 	bufs = (vq->vring.avail->idx - vq->last_used_idx) * 3 / 4;
 	vring_used_event(&vq->vring) = vq->last_used_idx + bufs;
 	virtio_mb();
-	if (unlikely(vq->vring.used->idx - vq->last_used_idx > bufs)) {
+	if (unlikely((u16)(vq->vring.used->idx - vq->last_used_idx) > bufs)) {
 		END_USE(vq);
 		return false;
 	}
 
-- 
1.7.5.53.gc233e
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