[PATCH net-next] hv_netvsc: Fix rndis_filter_close error during netvsc_remove

[Haiyang Zhang]

From: Haiyang Zhang <haiya...@microsoft.com>

We now remove rndis filter before unregister_netdev(), which calls
device close. It involves closing rndis filter already removed.

This patch fixes this error.

Signed-off-by: Haiyang Zhang <haiya...@microsoft.com>
---
 drivers/net/hyperv/netvsc_drv.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index c0c4c9195a3f..fac44c5c8d0d 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -119,12 +119,16 @@ static int netvsc_close(struct net_device *net)
        struct net_device *vf_netdev
                = rtnl_dereference(net_device_ctx->vf_netdev);
        struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
-       int ret;
+       int ret = 0;
        u32 aread, i, msec = 10, retry = 0, retry_max = 20;
        struct vmbus_channel *chn;
 
        netif_tx_disable(net);
 
+       /* No need to close rndis filter if it is removed already */
+       if (!nvdev)
+               goto out;
+
        ret = rndis_filter_close(nvdev);
        if (ret != 0) {
                netdev_err(net, "unable to close device (ret %d).\n", ret);
@@ -163,6 +167,7 @@ static int netvsc_close(struct net_device *net)
                ret = -ETIMEDOUT;
        }
 
+out:
        if (vf_netdev)
                dev_close(vf_netdev);
 
-- 
2.14.0