netdev - Re: [PATCH net v4] net: devmem: fix kernel panic when netlink socket close after module unload

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Message-ID: <CAMArcTVssM7bc6jQWnbBri1ttzRU7GvK8egJ7Ff27iRv3ehSSQ@mail.gmail.com>
Date: Wed, 14 May 2025 14:42:49 +0900
From: Taehee Yoo <ap420073@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, pabeni@...hat.com, edumazet@...gle.com, 
	horms@...nel.org, almasrymina@...gle.com, sdf@...ichev.me, 
	netdev@...r.kernel.org, asml.silence@...il.com, dw@...idwei.uk, 
	skhawaja@...gle.com, kaiyuanz@...gle.com, jdamato@...tly.com
Subject: Re: [PATCH net v4] net: devmem: fix kernel panic when netlink socket
 close after module unload

On Tue, May 13, 2025 at 11:30 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue, 13 May 2025 12:24:52 +0900 Taehee Yoo wrote:
> > > On Mon, 12 May 2025 08:40:59 +0000 Taehee Yoo wrote:
> > > > @@ -943,8 +943,6 @@ int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info)
> > > >                       goto err_unbind;
> > > >       }
> > > >
> > > > -     list_add(&binding->list, &priv->bindings);
> > >
> > > Please leave this list_add() where it was.
> >
> > list_add() is moved to net_devmem_bind_dmabuf() by this patch.
> > So, you mean that let's make net_devmem_{bind | unbind}_dmabuf()
> > don't handle list themself like the v3 patch, right?
>
> Not exactly like in v3. In v3 list_del() was moved. I think these moves
> are due to cleanup which I requested earlier? There is no functional
> need for these? I'm giving up on that cleanup request for now.
> Let's leave the list modifications where they are.

Thanks, now I understand.
I will make the next patch only fix this issue and drop the
cleanup changes.

Thanks a lot!
Taehee Yoo