virtio/net: verify device has config space
authorMichael S. Tsirkin <mst@redhat.com>
Mon, 12 Jan 2015 14:23:37 +0000 (16:23 +0200)
committerRusty Russell <rusty@rustcorp.com.au>
Wed, 21 Jan 2015 05:58:47 +0000 (16:28 +1030)
Some devices might not implement config space access
(e.g. remoteproc used not to - before 3.9).
virtio/net needs config space access so make it
fail gracefully if not there.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
drivers/net/virtio_net.c

index 5ca97713bfb33b5d5a7770f3ae6a2000a19df423..9bc107200709fdf501ad473017ef335aff996c18 100644 (file)
@@ -1713,6 +1713,12 @@ static int virtnet_probe(struct virtio_device *vdev)
        struct virtnet_info *vi;
        u16 max_queue_pairs;
 
+       if (!vdev->config->get) {
+               dev_err(&vdev->dev, "%s failure: config access disabled\n",
+                       __func__);
+               return -EINVAL;
+       }
+
        if (!virtnet_validate_features(vdev))
                return -EINVAL;