hv_netvsc: fix locking during VF setup

[ Upstream commit b0dee7910317f41f398838992516af6a3b981d86 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 99b71b4..3a7241c 100644 (file)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1848,8 +1848,12 @@ 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);