hv_netvsc: move start_remove flag to net_device_context

struct netvsc_device is destroyed on mtu change so keeping the
protection flag there is not a good idea. Move it to struct
net_device_context which is preserved.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index ba3f3f3..b3fa2cd 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -793,7 +793,7 @@
 		goto out;
 
  do_set:
-	nvdev->start_remove = true;
+	net_device_ctx->start_remove = true;
 	rndis_filter_device_remove(dev);
 
 	nvdev->num_chn = channels->combined_count;
@@ -837,6 +837,7 @@
 
  out:
 	netvsc_open(net);
+	net_device_ctx->start_remove = false;
 
 	return ret;
 
@@ -927,7 +928,7 @@
 
 	num_chn = nvdev->num_chn;
 
-	nvdev->start_remove = true;
+	ndevctx->start_remove = true;
 	rndis_filter_device_remove(hdev);
 
 	ndev->mtu = mtu;
@@ -943,6 +944,7 @@
 
 out:
 	netvsc_open(ndev);
+	ndevctx->start_remove = false;
 
 	return ret;
 }
@@ -1358,6 +1360,9 @@
 	}
 
 	hv_set_drvdata(dev, net);
+
+	net_device_ctx->start_remove = false;
+
 	INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
 	INIT_WORK(&net_device_ctx->work, do_set_multicast);
 	INIT_WORK(&net_device_ctx->gwrk.dwrk, netvsc_notify_peers);
@@ -1419,9 +1424,10 @@
 		return 0;
 	}
 
-	net_device->start_remove = true;
 
 	ndev_ctx = netdev_priv(net);
+	ndev_ctx->start_remove = true;
+
 	cancel_delayed_work_sync(&ndev_ctx->dwork);
 	cancel_work_sync(&ndev_ctx->work);