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

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Message-ID: <1401311820.6186.27.camel@x220>
Date:	Wed, 28 May 2014 23:17:00 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Tilman Schmidt <tilman@...p.cc>, netdev@...r.kernel.org,
	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, 2014-05-28 at 14:12 -0700, Greg Kroah-Hartman wrote:
> On Wed, May 28, 2014 at 11:06:41PM +0200, Paul Bolle wrote:
> > On Wed, 2014-05-28 at 13:56 -0700, Greg Kroah-Hartman wrote:
> > > 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?
> > 
> > As in: set struct tty_driver.name to "capi!"?
> 
> Yes.  Try it and see :)
> 
> If not, let me know, it should "just work".

I'll let you know. But chances are v2 will only contain 3 patches!

> > > > 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?
> > 
> > Did you already read the explanation to 4/4? It contains a summary of
> > the events that got us in the current situation.
> 
> Sorry, only read patch 3 as it came first :)
> 
> But try the above first, the driver core and udev supports the '!'
> character for subdirs for a very long time thanks to some horrid scsi
> drivers needing it...

Will do. And I'll probably ponder how I managed to miss an easy way out.
Thanks for the review!


Paul Bolle

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