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

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

[Tilman Schmidt]

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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@imap.cc
Bonn, Germany
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