linux-kernel - Re: ppdev - libieee1284.so conflicts with 2.6.21

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Date:	Mon, 2 Jul 2007 15:47:53 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Juan Antonio Martinez <jonsito@...eline.es>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: ppdev - libieee1284.so  conflicts with 2.6.21

On Mon, 02 Jul 2007 11:22:09 +0200
Juan Antonio Martinez <jonsito@...eline.es> wrote:

> I've reported this error to Fedora Bugzilla:
> 
> http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=246406
> 
> In sort: to use libieee1284 I need to disable ppdev usage with
> kernel 2.6.21. Kernel 2.6.20 works fine
> 
> [root@...ke char]# uname -a
> Linux drake.micasa.es 2.6.21-1.3228.fc7 #1 SMP Tue Jun 12 15:37:31 EDT
> 2007 i686 athlon i386 GNU/Linux
> 
> By doing "echo disallow method ppdev > /etc/ieee1284.conf" everything
> works fine on both kernels
> 
> Seems affect several distributions, not Fedora specific:
> http://bugs.archlinux.org/task/7438
> http://sourceforge.net/tracker/index.php?func=detail&aid=1739643&group_id=29314&atid=395778
> http://www.digipedia.pl/man/libieee1284.3.html
> 
> Not sure if a kernel bug or a library one, so my apologizes if
> this is not the propper list
> 

Not much has changed in ppdev.c.  Possibly this:

commit da6752964290567a6b4ea180d1becda75e810e87
Author: David Brownell <david-b@...bell.net>
Date:   Tue May 8 00:27:42 2007 -0700

    layered parport code uses parport->dev
    
    Update some of the layered parport_driver code to use parport->dev:
    
        - i2c-parport (parent of i2c_adapter)
        - spi_butterfly (parent of spi_master, allowing cruft removal)
        - lp (creating class_device)
        - ppdev (parent of parportN device)
        - tipar (creating class_device)
    
    There are still drivers that should be updated, like some of the input
    drivers; but they won't be any worse off than they are today.

broke something.

Can you test a kernel with this change applied?

--- a/drivers/char/ppdev.c~a
+++ a/drivers/char/ppdev.c
@@ -751,7 +751,7 @@ static const struct file_operations pp_f
 
 static void pp_attach(struct parport *port)
 {
-	device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number),
+	device_create(ppdev_class, NULL, MKDEV(PP_MAJOR, port->number),
 			"parport%d", port->number);
 }
 
_

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