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Date: Fri, 19 May 2017 13:58:40 +0100
From: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: linux-kernel@vger.kernel.org, kernel@pengutronix.de,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jslaby@suse.com>
Subject: Re: tty: closing n_gsm line discipline always times out
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> This option doesn't sound very nice because then userspace needs to know
> details of the protocol that it just wants to use. Also the cleanup
> won't be done if the userspace process is killed for some reason.

The same is basically true of an ioctl unfortunately.

Alan