2025-01-22, 00:26:50 +0100, Antonio Quartulli wrote:
> On 20/01/2025 15:52, Antonio Quartulli wrote:
> > On 17/01/2025 12:48, Sabrina Dubroca wrote:
> > [...]
> > > -------- 8< --------
> > >
> > > diff --git a/drivers/net/ovpn/netlink.c b/drivers/net/ovpn/netlink.c
> > > index 72357bb5f30b..19aa4ee6d468 100644
> > > --- a/drivers/net/ovpn/netlink.c
> > > +++ b/drivers/net/ovpn/netlink.c
> > > @@ -733,6 +733,9 @@ int ovpn_nl_peer_del_doit(struct sk_buff *skb,
> > > struct genl_info *info)
> > > netdev_dbg(ovpn->dev, "del peer %u\n", peer->id);
> > > ret = ovpn_peer_del(peer, OVPN_DEL_PEER_REASON_USERSPACE);
> > > + if (ret >= 0 && peer->sock)
> > > + wait_for_completion(&peer->sock_detach);
> > > +
> > > ovpn_peer_put(peer);
> > > return ret;
> > > diff --git a/drivers/net/ovpn/peer.c b/drivers/net/ovpn/peer.c
> > > index b032390047fe..6120521d0c32 100644
> > > --- a/drivers/net/ovpn/peer.c
> > > +++ b/drivers/net/ovpn/peer.c
> > > @@ -92,6 +92,7 @@ struct ovpn_peer *ovpn_peer_new(struct ovpn_priv
> > > *ovpn, u32 id)
> > > ovpn_peer_stats_init(&peer->vpn_stats);
> > > ovpn_peer_stats_init(&peer->link_stats);
> > > INIT_WORK(&peer->keepalive_work, ovpn_peer_keepalive_send);
> > > + init_completion(&peer->sock_detach);
> > > ret = dst_cache_init(&peer->dst_cache, GFP_KERNEL);
> > > if (ret < 0) {
> > > diff --git a/drivers/net/ovpn/peer.h b/drivers/net/ovpn/peer.h
> > > index 7a062cc5a5a4..8c54bf5709ef 100644
> > > --- a/drivers/net/ovpn/peer.h
> > > +++ b/drivers/net/ovpn/peer.h
> > > @@ -112,6 +112,7 @@ struct ovpn_peer {
> > > struct rcu_head rcu;
> > > struct work_struct remove_work;
> > > struct work_struct keepalive_work;
> > > + struct completion sock_detach;
> > > };
> > > /**
> > > diff --git a/drivers/net/ovpn/socket.c b/drivers/net/ovpn/socket.c
> > > index a5c3bc834a35..7cefac42c3be 100644
> > > --- a/drivers/net/ovpn/socket.c
> > > +++ b/drivers/net/ovpn/socket.c
> > > @@ -31,6 +31,8 @@ static void ovpn_socket_release_kref(struct kref *kref)
> > > sockfd_put(sock->sock);
> > > kfree_rcu(sock, rcu);
> > > +
> > > + complete(&sock->peer->sock_detach);
>
> I am moving this line to ovpn_socket_put(), right after kref_put() so that
> every peer going through the socket release will get their complete()
> invoked.
>
> If the peer happens to be the last one owning the socket, kref_put() will
> first do the detach and only then complete() gets called.
>
> This requires ovpn_socket_release/put() to take the peer as argument, but
> that's ok.
>
> This way we should achieve what we needed.
This seems like it would, thanks.
--
Sabrina
