virtio-net: Use virtio_config_val() for retrieving config

This patch modifies virtio-net to use virtio_config_val() instead
of a 'if(virtio_has_feature()) vdev->config->get()' construct to retrieve
optional values from the config space.

Cc: Amit Shah <amit.shah@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 91039ab..6ee8410 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -925,12 +925,10 @@ static void virtnet_update_status(struct virtnet_info *vi)
 {
        u16 v;
 
-       if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS))
-               return;
-
-       vi->vdev->config->get(vi->vdev,
+       if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
                              offsetof(struct virtio_net_config, status),
-                             &v, sizeof(v));
+                             &v) < 0)
+               return;
 
        /* Ignore unknown (future) status bits */
        v &= VIRTIO_NET_S_LINK_UP;
@@ -1006,11 +1004,9 @@ static int virtnet_probe(struct virtio_device *vdev)
        }
 
        /* Configuration may specify what MAC to use.  Otherwise random. */
-       if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
-               vdev->config->get(vdev,
+       if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
                                  offsetof(struct virtio_net_config, mac),
-                                 dev->dev_addr, dev->addr_len);
-       } else
+                                 dev->dev_addr, dev->addr_len) < 0)
                random_ether_addr(dev->dev_addr);
 
        /* Set up our device-specific information */