X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=drivers%2Fnet%2Fvirtio%2Fvirtqueue.h;h=2e2abf15bdc17bf511e75fc59806e62e05fc6d74;hb=e2bea7436061ca2e7e14bfcfdc5870f2555c3965;hp=26518ed98c207011b2fbebe32db08344e5847317;hpb=a4f0fa29488e582ab8b5ef9db475b3d26ded690c;p=deb_dpdk.git

diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index 26518ed9..2e2abf15 100644
--- 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);
 }