hv_netvsc: fix locking during VF setup

The dev_uc/mc_sync calls need to have the device address list
locked. This was spotted by running with lockdep enabled.

Fixes: bee9d41b37ea ("hv_netvsc: propagate rx filters to VF")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.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 48d9fa7a66c2811e1dce7c3d7010ccf9a000e5ef..faea0be18924a58a0d8b2c52f93239cfac80542f 100644 (file)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1851,8 +1851,12 @@ static void __netvsc_vf_setup(struct net_device *ndev,
 
        /* set multicast etc flags on VF */
        dev_change_flags(vf_netdev, ndev->flags | IFF_SLAVE);
+
+       /* sync address list from ndev to VF */
+       netif_addr_lock_bh(ndev);
        dev_uc_sync(vf_netdev, ndev);
        dev_mc_sync(vf_netdev, ndev);
+       netif_addr_unlock_bh(ndev);
 
        if (netif_running(ndev)) {
                ret = dev_open(vf_netdev);