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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Wed, 24 Apr 2019 14:59:33 +0200
Message-ID: <CAK8P3a2FLrGXh9iv4eWBX8D_zb7rq5YDErkzDjjHbA5JENHVGw@mail.gmail.com>
Subject: Re: [PATCH 0/5] isdn: deprecate non-mISDN drivers
To:     Marcel Holtmann <marcel@holtmann.org>
Cc:     Greg KH <gregkh@linuxfoundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "David S. Miller" <davem@davemloft.net>,
        Karsten Keil <isdn@linux-pingi.de>,
        Networking <netdev@vger.kernel.org>,
        isdn4linux@listserv.isdn4linux.de, Paul Bolle <pebolle@tiscali.nl>,
        Holger Schurig <holgerschurig@googlemail.com>,
        Tilman Schmidt <tilman@imap.cc>,
        Al Viro <viro@zeniv.linux.org.uk>,
        gigaset307x-common@lists.sourceforge.net,
        Johan Hedberg <johan.hedberg@gmail.com>,
        Bluez mailing list <linux-bluetooth@vger.kernel.org>
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On Wed, Apr 24, 2019 at 12:24 PM Marcel Holtmann <marcel@holtmann.org> wrote:
> >>> When isdn4linux came up in the context of another patch series, I
> >>> remembered that we had discussed removing it a while ago.
>
> NAK.
>
> I do not care about isdn4linux, but this is a purely CAPI based driver. So removing (or moving to staging)
> CAPI support seems rather premature.
>
> Maybe someone would have started talking to us before trying to move this into staging. It is a
> maintained driver. That it is rather simple and hasn’t seen patches in a long time, doesn’t mean
> it is not maintained and staging material. I see no reason to tell any user to enable staging tree
> to get CMTP support.

I can definitely leave out the last patch from the series if we know
that there are
still users on CMTP. I searched around for a bit but could not find
any indication
what this is still used for, if anything.

What I found were a couple of references of the driver no longer working
about 10 years ago:

https://wiki.ubuntuusers.de/Archiv/Bluetooth/BlueFritz%21/
https://www.opensuse-forum.de/thread/2776-erledigt-suse-11-2-und-bluefritz/

Is anyone using cmtp for voice or fax services? The use cases from before 2009
that I could find were usually dial-up networking, but that seems pointless now
if the only way to get an ISDN connection is to have it routed over
the internet.

What am I missing?

     Arnd