+static int netvsc_detach(struct net_device *ndev,
+ struct netvsc_device *nvdev)
+{
+ struct net_device_context *ndev_ctx = netdev_priv(ndev);
+ struct hv_device *hdev = ndev_ctx->device_ctx;
+ int ret;
+
+ /* Don't try continuing to try and setup sub channels */
+ if (cancel_work_sync(&nvdev->subchan_work))
+ nvdev->num_chn = 1;
+
+ /* If device was up (receiving) then shutdown */
+ if (netif_running(ndev)) {
+ netif_tx_disable(ndev);
+
+ ret = rndis_filter_close(nvdev);
+ if (ret) {
+ netdev_err(ndev,
+ "unable to close device (ret %d).\n", ret);
+ return ret;
+ }
+
+ ret = netvsc_wait_until_empty(nvdev);
+ if (ret) {
+ netdev_err(ndev,
+ "Ring buffer not empty after closing rndis\n");
+ return ret;
+ }
+ }
+
+ netif_device_detach(ndev);
+
+ rndis_filter_device_remove(hdev, nvdev);
+
+ return 0;
+}
+
+static int netvsc_attach(struct net_device *ndev,
+ struct netvsc_device_info *dev_info)
+{
+ struct net_device_context *ndev_ctx = netdev_priv(ndev);
+ struct hv_device *hdev = ndev_ctx->device_ctx;
+ struct netvsc_device *nvdev;
+ struct rndis_device *rdev;
+ int ret;
+
+ nvdev = rndis_filter_device_add(hdev, dev_info);
+ if (IS_ERR(nvdev))
+ return PTR_ERR(nvdev);
+
+ /* Note: enable and attach happen when sub-channels setup */
+
+ netif_carrier_off(ndev);
+
+ if (netif_running(ndev)) {
+ ret = rndis_filter_open(nvdev);
+ if (ret)
+ return ret;
+
+ rdev = nvdev->extension;
+ if (!rdev->link_state)
+ netif_carrier_on(ndev);
+ }
+
+ return 0;
+}
+