RE: hv_netvsc: WARNING: suspicious RCU usage?

[Dexuan Cui <decui@xxxxxxxxxxxxx>]

> From: linux-hyperv-owner@xxxxxxxxxxxxxxx
> <linux-hyperv-owner@xxxxxxxxxxxxxxx> On Behalf Of Dexuan Cui
> Sent: Monday, August 5, 2019 4:56 PM
> The warning is caused by the rcu_dereference_rtnl() :
> 
> 1239 static void netvsc_get_stats64(struct net_device *net,
> 1240                                struct rtnl_link_stats64 *t)
> 1241 {
> 1242         struct net_device_context *ndev_ctx = netdev_priv(net);
> 1243         struct netvsc_device *nvdev =
> rcu_dereference_rtnl(ndev_ctx->nvdev);
> 
> I think here netvsc_get_stats64() neither holds rcu_read_lock() nor RTNL
> 
> IMO it should call rcu_read_lock()/unlock(), or get RTNL to fix the warning?

I just posted a patch on behalf of Stephen:
[PATCH net] hv_netvsc: Fix a warning of suspicious RCU usage
 
Thanks,
-- Dexuan