Re: [uml-devel] um: TTY fixes (?)

[Boaz Harrosh <bharrosh@panasas.com>]

On 06/04/2012 11:27 PM, Richard Weinberger wrote:

> This patch set moves the UML console driver to the new TTY port interface.
> It does ref counting and uses the tty_port_*-helpers.
> Please note, it's not yet UML mconsole safe!
> 
> Anyway, I see some really strange things and I'm not sure whether my patch
> is sane or not...
> 
> If I implement tty_operations->hangup() the following happens:
> 
> FC12:
> 	Login on tty0 works fine.
> 	On all other ttys login works but bash dies because of of -EIO.
> 	After vhangup() the tty returns -EIO upon read()/write().
> FC16:
> 	Login broken on all ttys (bash dies with EIO like on FC12).
> 	If I start UML with rootfs read-only login works on tty0. - WTF?!
> Debian 6.0:
> 	Login works perfectly fine on all ttys
> 
> Without tty_operations->hangup() the following happens:
> FC12:
> 	Login on tty0 works fine.


Horray I'm back to my old self. Thanks I'll give it a run
and report of any new problems

Thanks a million Richard
Boaz

> 	mingetty is unable to start on anything else than tty0.
> 	It exits after a few seconds.
> FC16:
> 	Unable to start any mingetty (like on FC12 it exits after a few seconds)
> 	With read-only rootfs mingetty starts at least on tty0 and login works. (Again, WTF?)
> Debian 6.0
> 	Login works perfectly fine on all ttys.
> 
> I have no idea what's the root cause of this, there seems to be a lot of black magic
> involved.
> Alan, do you think the issues are caused by Fedora's broken user space?
> How can we fix this?
> 
> Thanks,
> //richard (wearing a voodoo priests robe)
> 
> [PATCH 1/6] TTY: um/line, add tty_port
> [PATCH 2/6] TTY: um/line, use tty from tty_port
> [PATCH 3/6] um: remove line_ioctl()
> [PATCH 4/6] um: Remove dead code
> [PATCH 5/6] um: fully use tty_port
> [PATCH 6/6] um: remove count_lock
> 
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