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Date: Mon, 8 May 2006 13:00:29 -0700
From: Andrew Morton <akpm@osdl.org>
To: Stefan Schweizer <genstef@gentoo.org>
Cc: linux-kernel@vger.kernel.org, i4ldeveloper@listserv.isdn4linux.de
Subject: Re: [PATCH 2.6.17-rc3] Fix capi reload by unregistering the correct
 major
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Stefan Schweizer <genstef@gentoo.org> wrote:
>
> I am having the bug
> FATAL: Error inserting capi ([..]/capi.ko): Device or resource busy
> when I try to reload capi after loading it.
> in dmesg: capi20: unable to get major 68

This is odd.

> I attached a patch to fix the issue which is caused by setting the major to
> zero when registering the chrdev succeeded. Please apply
> - - Stefan
> 
> errors in the dmesg:
> 
> CAPI Subsystem Rev 1.1.2.8
> capifs: Rev 1.1.2.3
> capi20: Rev 1.1.2.7: started up with major 0 (middleware+capifs)
> <-- here you see that it was set to 0.
> (after unload and retry)
> capi: Rev 1.1.2.7: unloaded
> CAPI Subsystem Rev 1.1.2.8
> capi20: unable to get major 68
> <-- the chrdev has not been unlinked

> --- drivers/isdn/capi/capi.c.orig	2006-04-29 18:40:25.000000000 +0200
> +++ drivers/isdn/capi/capi.c	2006-04-29 18:27:22.000000000 +0200
> @@ -1499,7 +1499,6 @@
>  		printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
>  		return major_ret;
>  	}
> -	capi_major = major_ret;
>  	capi_class = class_create(THIS_MODULE, "capi");
>  	if (IS_ERR(capi_class)) {
>  		unregister_chrdev(capi_major, "capi20");
> 
> 
> 

What does "unload and retry" mean?

An `rmmod capi;modprobe capi' will reset the major to 68, so you must mean
something else.  What?