linux-kernel - Re: [PATCH 06/11] pps: serial clients support.

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Date:	Thu, 3 Dec 2009 13:05:24 +0100
From:	Rodolfo Giometti <giometti@...eenne.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Dave Jones <davej@...hat.com>, Sam Ravnborg <sam@...nborg.org>,
	Greg KH <greg@...ah.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Kay Sievers <kay.sievers@...y.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 06/11] pps: serial clients support.

On Thu, Dec 03, 2009 at 11:46:41AM +0000, Alan Cox wrote:

> > Again, should I remove the possibility to compile pps-ldisc as module?
> 
> It would do that yes. I hadn't considered that aspect of it - and that in
> turn would force you to compile the core PPS support in to get pps-ldisc.
> 
> How about this then (I'm trying to see a way to avoid all thsoe exports
> of functions)
> 
> /**
>  *	n_tty_inherit_ops		-	initialise ldisc ops
>  *	@ops: ops to initialise
>  *
>  *	Allow a line discipline to inherit the basic operations
>  *	from the n_tty line discipline. The caller must set up
>  *	its own ldisc number, flags and name. It must use the
>  *	inherited value of magic.
>  */
> 
> void n_tty_init_ops(struct tty_ldisc_ops *ops)
> {
> 	*ops = tty_ldisc_N_TTY;
> 	ops->owner = NULL:
> 	ops->refcount = ops->flags = 0;
> }
> EXPORT_SYMBOL_GPL(n_tty_inherit_ops);

The problem is that I have to do some operations into ldisc's open and
close methods (see linux/drivers/pps/clients/pps-ldisc.c).

By using your solution I inherit such methods but I cannot modify
their behaviour in a manner suitable for register/deregister PPS
support at runtime.

Ciao,

Rodolfo

-- 

GNU/Linux Solutions                  e-mail: giometti@...eenne.com
Linux Device Driver                          giometti@...ux.it
Embedded Systems                     phone:  +39 349 2432127
UNIX programming                     skype:  rodolfo.giometti
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