On Mon, 2017-12-04 at 17:31 +0800, Jason Wang wrote:
> This patch introduces an eBPF based queue selection method. With
> this,
> the policy could be offloaded to userspace completely through a new
> ioctl TUNSETSTEERINGEBPF.
Sorry for the delay, I see this patch was merged already.
...
> static void tun_free_netdev(struct net_device *dev)
> {
> struct tun_struct *tun = netdev_priv(dev);
> @@ -1996,6 +2068,9 @@ static void tun_free_netdev(struct net_device
> *dev)
> free_percpu(tun->pcpu_stats);
> tun_flow_uninit(tun);
> security_tun_dev_free_security(tun->security);
> + rtnl_lock();
> + __tun_set_steering_ebpf(tun, NULL);
> + rtnl_unlock();
> }
I am pretty sure tun_free_netdev() (aka ->priv_destructor()) can be
called under RTNL (say from register_netdevice())
So this will dead lock badly ?
