netdev - [PATCH net-next 2/2] netvsc: allow driver to be removed even if VF is present

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Message-Id: <20170831231613.15805-3-sthemmin@microsoft.com>
Date:   Thu, 31 Aug 2017 16:16:13 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com
Cc:     devel@...uxdriverproject.org, netdev@...r.kernel.org
Subject: [PATCH net-next 2/2] netvsc: allow driver to be removed even if VF is present

If VF is attached then can still allow netvsc driver module to
be removed. Just have to make sure and do the cleanup.

Also, avoid extra rtnl round trip when calling unregister.

Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
---
 drivers/net/hyperv/netvsc_drv.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 128165e49c9a..97ed4bdc439f 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1834,9 +1834,6 @@ static int netvsc_register_vf(struct net_device *vf_netdev)
 
 	netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
 
-	/* Prevent this module from being unloaded while VF is registered */
-	try_module_get(THIS_MODULE);
-
 	dev_hold(vf_netdev);
 	rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
 	return NOTIFY_OK;
@@ -1880,10 +1877,11 @@ static int netvsc_unregister_vf(struct net_device *vf_netdev)
 
 	netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
 
+	netdev_rx_handler_unregister(vf_netdev);
 	netdev_upper_dev_unlink(vf_netdev, ndev);
 	RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
 	dev_put(vf_netdev);
-	module_put(THIS_MODULE);
+
 	return NOTIFY_OK;
 }
 
@@ -1987,11 +1985,11 @@ static int netvsc_probe(struct hv_device *dev,
 
 static int netvsc_remove(struct hv_device *dev)
 {
-	struct net_device *net;
 	struct net_device_context *ndev_ctx;
+	struct net_device *vf_netdev;
+	struct net_device *net;
 
 	net = hv_get_drvdata(dev);
-
 	if (net == NULL) {
 		dev_err(&dev->device, "No net device to remove\n");
 		return 0;
@@ -2008,12 +2006,15 @@ static int netvsc_remove(struct hv_device *dev)
 	 * removed. Also blocks mtu and channel changes.
 	 */
 	rtnl_lock();
+	vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
+	if (vf_netdev)
+		netvsc_unregister_vf(vf_netdev);
+
 	rndis_filter_device_remove(dev,
 				   rtnl_dereference(ndev_ctx->nvdev));
+	unregister_netdevice(net);
 	rtnl_unlock();
 
-	unregister_netdev(net);
-
 	hv_set_drvdata(dev, NULL);
 
 	free_percpu(ndev_ctx->vf_stats);
-- 
2.11.0