virtio_net: disable mac write for virtio 1.0

The spec states that mac in config space is only driver-writable in the
legacy case.  Fence writing it in virtnet_set_mac_address() in the
virtio 1.0 case.

Suggested-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index a0e64cfdbc24..b8bd7191572d 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1030,7 +1030,8 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p)
                                  "Failed to set mac address by vq command.\n");
                         return -EINVAL;
                 }
-        } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
+        } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
+                   !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
                 unsigned int i;
 
                 /* Naturally, this has an atomicity problem. */