linux-kernel - Re: [PATCH 60/80] tty: extract the pty init time special cases

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Date:	Wed, 21 Jan 2009 21:16:58 -0500
From:	bmckinlay@...le.com
To:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 60/80] tty: extract the pty init time special cases

My question/comment is in regards to the following patch indicated below 
that was posted on October 13, 2008.

>  From Alan Cox <>
> Subject       [PATCH 60/80] tty: extract the pty init time special cases
> Date  Mon, 13 Oct 2008 10:42:39 +0100
>
> From: Alan Cox <alan@...hat.com>
> 
> The majority of the remaining init_dev code is pty special cases. We 
> refactor this code into the driver->install method.
> 
> Signed-off-by: Alan Cox <alan@...hat.com>
> ---
>  drivers/char/pty.c    |  126 ++++++++++++++++++++++++++++---
>  drivers/char/tty_io.c |  198 
+++++++++++++++++--------------------------------
>  include/linux/tty.h   |    5 +
>  3 files changed, 187 insertions(+), 142 deletions(-)
> 

This patch seems to break any other pseudo tty drivers, (ie driver->type 
==TTY_DRIVER_TYPE_PTY) since not all the tty functions needed for the 
driver's new driver->install method are exported from tty_io.c.  The 
function symbols that need to be exported from /drivers/char/tty_io.c are 
the following:

   EXPORT_SYMBOL_GPL(alloc_tty_struct);
   EXPORT_SYMBOL_GPL(free_tty_struct);
   EXPORT_SYMBOL_GPL(tty_init_termios);
   EXPORT_SYMBOL_GPL(initialize_tty_struct);

I've added these lines and recompiled a 2.6.28 kernel along with adding 
new driver->install methods to my master and slave pseudo tty driver and 
it seems to work fine now.

Before I go ahead and post a patch, does anyone see any problems with 
this?

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