diff options
Diffstat (limited to 'drivers/vhost/vhost.c')
| -rw-r--r-- | drivers/vhost/vhost.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 8f99fe08de02..4269e621e254 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2239,11 +2239,15 @@ bool vhost_vq_avail_empty(struct vhost_dev *dev, struct vhost_virtqueue *vq) __virtio16 avail_idx; int r; + if (vq->avail_idx != vq->last_avail_idx) + return false; + r = vhost_get_user(vq, avail_idx, &vq->avail->idx); - if (r) + if (unlikely(r)) return false; + vq->avail_idx = vhost16_to_cpu(vq, avail_idx); - return vhost16_to_cpu(vq, avail_idx) == vq->avail_idx; + return vq->avail_idx == vq->last_avail_idx; } EXPORT_SYMBOL_GPL(vhost_vq_avail_empty); |