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Subject[RFC PATCH 0/5] patches for a network-based hvc backend (s390)

I work on a network-based hvc console backend for s390 that allows
to get "full-screen" terminal access to z/VM guest machines.
The solution consists of a HVC backend that provides the terminal interface;
and a tool to connect to the terminal via a z/VM specific communication

The network-based backend differs in a few aspects from the notifier-based
model of the HVC console; because it has to deal with (dis)connects and must
take care of virtual tty hangups. Therefore, I would like to introduce a third
notifier for hangups (see patch 1).

Further I found out that if put_char() returns 0 in particular cases, the hvc
console starts to loop. I tried to address this problem with patch 3 and I hope
that it will work for all backends.

Finally, I would like to add a function that allows to resize the terminal
window of a HVC terminal (patch 4).

Here is an overview about the complete patch series:
Patch 1 adds a hangup notifier
Patch 2 adds tty driver flag TTY_DRIVER_RESET_TERMIOS
Patch 3 fixes a loop if put_char() returns 0
Patch 4 adds a function to resize the tty window
Patch 5 removes __devexit of hvc_remove() for use in __(dev)init sections

Any review feedback would be greatly appreciated.
Thank you in advance.

Hendrik Brueckner
D/3303 Linux on System z Development
Tel: +49 7031 16-1073
Fax: +49 7031 16-3456
IBM Deutschland Research & Development GmbH, Schoenaicher Str. 220, 71032 Boeblingen

IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter
Geschaeftsfuehrung: Erich Baier
Sitz der Gesellschaft: Boeblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294

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