netdev - Re: [PATCH net-next v18 05/25] ovpn: introduce the ovpn

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Message-ID: <Z4pFyxhmBgKBA4-Z@hog>
Date: Fri, 17 Jan 2025 12:58:03 +0100
From: Sabrina Dubroca <sd@...asysnail.net>
To: Antonio Quartulli <antonio@...nvpn.net>
Cc: netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Donald Hunter <donald.hunter@...il.com>,
	Shuah Khan <shuah@...nel.org>, ryazanov.s.a@...il.com,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Simon Horman <horms@...nel.org>, linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org, Xiao Liang <shaw.leon@...il.com>
Subject: Re: [PATCH net-next v18 05/25] ovpn: introduce the ovpn_peer object

2025-01-13, 10:31:24 +0100, Antonio Quartulli wrote:
> +static void ovpn_peer_release(struct ovpn_peer *peer)
> +{
> +	ovpn_bind_reset(peer, NULL);
> +	netdev_put(peer->ovpn->dev, &peer->dev_tracker);

I think this needs to move after the call_rcu. Otherwise, module
unload could proceed (no more ref on the last ovpn netdevice), not see
any pending work in the final rcu_barrier of ovpn_cleanup, and finish
unloading. Then when ovpn_peer_release_rcu gets called, it's not there
anymore.

> +	call_rcu(&peer->rcu, ovpn_peer_release_rcu);
> +}

-- 
Sabrina