1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 72bf8bc09014..21d9a62767af 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -87,8 +87,11 @@ static int vring_add_buf(struct virtqueue *_vq,
         if (vq->num_free < out + in) {
                 pr_debug("Can't add buf len %i - avail = %i\n",
                          out + in, vq->num_free);
-                /* We notify *even if* VRING_USED_F_NO_NOTIFY is set here. */
-                vq->notify(&vq->vq);
+                /* FIXME: for historical reasons, we force a notify here if
+                 * there are outgoing parts to the buffer.  Presumably the
+                 * host should service the ring ASAP. */
+                if (out)
+                        vq->notify(&vq->vq);
                 END_USE(vq);
                 return -ENOSPC;
         }