New upstream version 18.11.1

[deb_dpdk.git] / drivers / net / virtio / virtqueue.h

diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index 26518ed..2e2abf1 100644 (file)
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -336,6 +336,11 @@ vq_update_avail_ring(struct virtqueue *vq, uint16_t desc_idx)
 static inline int
 virtqueue_kick_prepare(struct virtqueue *vq)
 {
+       /*
+        * Ensure updated avail->idx is visible to vhost before reading
+        * the used->flags.
+        */
+       virtio_mb();
        return !(vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY);
 }