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Date:   Wed, 24 Apr 2019 10:14:55 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Simon Horman <horms@...ge.net.au>
Cc:     Karsten Keil <isdn@...ux-pingi.de>,
        Networking <netdev@...r.kernel.org>,
        isdn4linux@...tserv.isdn4linux.de, Paul Bolle <pebolle@...cali.nl>,
        Holger Schurig <holgerschurig@...glemail.com>,
        Tilman Schmidt <tilman@...p.cc>,
        Al Viro <viro@...iv.linux.org.uk>,
        gigaset307x-common@...ts.sourceforge.net
Subject: Re: [PATCH 0/5] isdn: deprecate non-mISDN drivers

On Wed, Apr 24, 2019 at 9:56 AM Simon Horman <horms@...ge.net.au> wrote:
>
> Hi Arnd,
>
> On Tue, Apr 23, 2019 at 05:11:32PM +0200, Arnd Bergmann wrote:
> > When isdn4linux came up in the context of another patch series, I
> > remembered that we had discussed removing it a while ago.
> >
> > It turns out that the suggestion from Karsten Keil wa to remove I4L
> > in 2018 after the last public ISDN networks are shut down. This has
> > happened now (with a very small number of exceptions), so I guess it's
> > time to try again.
> >
> > We currently have three ISDN stacks in the kernel: the original
> > isdn4linux, the newer CAPI, and finally mISDN stack.
> >
> > As far as I can tell, anyone using ISDN with mainline kernel drivers in
> > the past few years uses mISDN, and this is typically used for voice-only
> > PBX installations that don't require a public network.
> >
> > The older stacks support additional features for data networks, but those
> > typically make no sense any more if there is no network to connect to.
> >
> > My proposal for this time is to kill off isdn4linux entirely, as it seems
> > to have been unusable for quite a while. This code has been abandoned
> > for many years and it does get in the way of maintenance.
>
> I think there is an editing error somewhere above. Perhaps it should read
>
> ... and it does not get anything in the way of maintenance.

This is certainly a true statement as well, but what I meant is that
the presence of isdn4linux in the kernel is causing extra work whenever
we want to do treewide changes. I'll rephrase to make that clearer.

Thanks for your review!

        Arnd

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