netdev - Re: [PATCH 3/4] tty: allow tty drivers to rename their device nodes

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Message-ID: <20140528205656.GA3117@kroah.com>
Date:	Wed, 28 May 2014 13:56:56 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Tilman Schmidt <tilman@...p.cc>
Cc:	netdev@...r.kernel.org, Paul Bolle <pebolle@...cali.nl>,
	isdn4linux@...tserv.isdn4linux.de,
	"Keil, Karsten" <isdn@...ux-pingi.de>, Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH 3/4] tty: allow tty drivers to rename their device nodes

On Wed, May 21, 2014 at 11:39:26PM +0200, Tilman Schmidt wrote:
> From: Paul Bolle <pebolle@...cali.nl>
> 
> The device nodes for tty drivers are named using a straightforward
> scheme: tty_driver->name with an (increasing) digit appended. But the
> capi driver (a part of one of the current ISDN subsystems) requires a
> different naming scheme for its "capi_nc" tty_driver:
>     /dev/capi/0
>     /dev/capi/1
>     [...]

Can't you just use a '!' character to represent the '/' and the tty core
will handle it all properly for you without this tty core change needed?

> So add a devnode() callback to struct tty_driver to allow tty drivers
> to use a more elaborate naming scheme. And let tty_devnode(), the
> devnode() callback for the "tty" class, call that new callback if a tty
> driver uses one. This allows the capi driver to add a callback to
> enable its scheme.

And why the sudden need for this feature, what changed in isdn to
warrant this change?

greg k-h
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