linux-kernel - assigning a line discipline to a serial device from inside the kernel

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Message-ID: <478DF8AB.50400@imap.cc>
Date:	Wed, 16 Jan 2008 13:29:31 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	linux-kernel@...r.kernel.org
Subject: assigning a line discipline to a serial device from inside the kernel

The Siemens Gigaset M101 driver (drivers/isdn/gigaset/ser_gigaset.ko)
is implemented as a serial line discipline N_GIGASET_M101, much like
the better-known N_SLIP and N_PPP LDs. It must therefore be "pushed"
onto a serial device in order to be used.

The classic approach is a trivial userspace daemon which opens the
device, sets the LD via ioctl(~,TIOCSETD,~), and must then sleep
indefinitely while keeping the device open, because closing it
would unload the LD.

Is there a clean and acceptable way to avoid this userspace daemon
and push the LD onto the serial device from within the kernel?

Thanks,
Tilman

-- 
Tilman Schmidt                    E-Mail: tilman@...p.cc
Bonn, Germany
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