Linux Virtualization - Dec 2014 - [PATCH v8 27/50] 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 at de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck at de.ibm.com>
---
 drivers/net/virtio_net.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index a0e64cf..b8bd719 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. */
-- 
MST