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Diffstat (limited to 'drivers/vhost/vhost.c')
-rw-r--r--drivers/vhost/vhost.c8
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);