netdev - Re: [PATCH net-next v3 07/24] ovpn: introduce the ovpn

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Date: Thu, 9 May 2024 15:24:33 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Sabrina Dubroca <sd@...asysnail.net>
Cc: Antonio Quartulli <antonio@...nvpn.net>, netdev@...r.kernel.org,
	Jakub Kicinski <kuba@...nel.org>,
	Sergey Ryazanov <ryazanov.s.a@...il.com>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>,
	Esben Haabendal <esben@...nix.com>
Subject: Re: [PATCH net-next v3 07/24] ovpn: introduce the ovpn_peer object

On Thu, May 09, 2024 at 03:04:36PM +0200, Sabrina Dubroca wrote:
> 2024-05-08, 22:31:51 +0200, Antonio Quartulli wrote:
> > On 08/05/2024 18:06, Sabrina Dubroca wrote:
> > > 2024-05-06, 03:16:20 +0200, Antonio Quartulli wrote:
> > > > diff --git a/drivers/net/ovpn/ovpnstruct.h b/drivers/net/ovpn/ovpnstruct.h
> > > > index ee05b8a2c61d..b79d4f0474b0 100644
> > > > --- a/drivers/net/ovpn/ovpnstruct.h
> > > > +++ b/drivers/net/ovpn/ovpnstruct.h
> > > > @@ -17,12 +17,19 @@
> > > >    * @dev: the actual netdev representing the tunnel
> > > >    * @registered: whether dev is still registered with netdev or not
> > > >    * @mode: device operation mode (i.e. p2p, mp, ..)
> > > > + * @lock: protect this object
> > > > + * @event_wq: used to schedule generic events that may sleep and that need to be
> > > > + *            performed outside of softirq context
> > > > + * @peer: in P2P mode, this is the only remote peer
> > > >    * @dev_list: entry for the module wide device list
> > > >    */
> > > >   struct ovpn_struct {
> > > >   	struct net_device *dev;
> > > >   	bool registered;
> > > >   	enum ovpn_mode mode;
> > > > +	spinlock_t lock; /* protect writing to the ovpn_struct object */
> > > 
> > > nit: the comment isn't really needed since you have kdoc saying the same thing
> > 
> > True, but checkpatch.pl (or some other script?) was still throwing a
> > warning, therefore I added this comment to silence it.
> 
> Ok, then I guess the comment (and the other one below) can stay. That
> sounds like a checkpatch.pl bug.

I suspect it is more complex than that. checkpatch does not understand
kdoc. It just knows the rule that there should be a comment next to a
lock, hopefully indicating what the lock protects. In order to fix
this, checkpatch would need to somehow invoke the kdoc parser, and ask
it if the lock has kdoc documentation.

I suspect we are just going to have to live with this.

  Andrew