linux-kernel - Re: subsystem_unregister() breakage in -mm

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Message-ID: <20070926092156.2f281eea@gondolin.boeblingen.de.ibm.com>
Date:	Wed, 26 Sep 2007 09:21:56 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Greg KH <greg@...ah.com>
Cc:	Miklos Szeredi <miklos@...redi.hu>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: subsystem_unregister() breakage in -mm

On Tue, 25 Sep 2007 19:41:21 -0700,
Greg KH <greg@...ah.com> wrote:

> Ok, here's a patch that fixes this for me.  It should go on top of the
> -mm tree.  Let me know of this works or not.

Looks sane to me.

> In the end, we need to dynamically allocate these subsystems to properly
> fix this.  In looking through the tree, there really isn't that many of
> them, so I'll try to knock that out later this week.

What they need at least is a dynamically allocated k_name. Same goes
for all those objects that use set_kset_name(), and there are quite a
few of those...

> 
> 
> thanks,
> 
> greg k-h
> 
> ---
>  lib/kobject.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> --- a/lib/kobject.c
> +++ b/lib/kobject.c
> @@ -487,11 +487,11 @@ void kobject_cleanup(struct kobject * ko
>  	struct kobject * parent = kobj->parent;
> 
>  	pr_debug("kobject %s: cleaning up\n",kobject_name(kobj));
> -	kfree(kobj->k_name);
> -	kobj->k_name = NULL;
> -	if (t && t->release)
> +	if (t && t->release) {
>  		t->release(kobj);
> -	else
> +		kfree(kobj->k_name);
> +		kobj->k_name = NULL;
> +	} else
>  		pr_debug("kobject '%s' does not have a release() function, "
>  			"if this is not a directory kobject, it is broken "
>  			"and must be fixed.\n",
-
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