vm-virtio: queue: fix a barrier comment at update_avail_event
The barrier had a comment coming from other context. Adjust it to be
relevant to its own context.
@@ -543,7 +543,7 @@ impl Queue {
None => warn!("Can't update avail_event"),
}
- // This fence ensures all descriptor writes are visible before the index update is.
+ // This fence ensures the guest sees the value we've just written.
fence(Ordering::Release);
}
