linux-kernel - Re: [RFC] Sample kset/ktype/kobject implementation

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Message-ID: <20071129061139.GI26327@kroah.com>
Date:	Wed, 28 Nov 2007 22:11:39 -0800
From:	Greg KH <greg@...ah.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Jonathan Corbet <corbet@....net>,
	Randy Dunlap <randy.dunlap@...cle.com>
Subject: Re: [RFC] Sample kset/ktype/kobject implementation

On Wed, Nov 28, 2007 at 05:35:32PM +0100, Cornelia Huck wrote:
> On Tue, 27 Nov 2007 15:04:06 -0800,
> Greg KH <greg@...ah.com> wrote:
> 
> > static struct foo_obj *create_foo_obj(const char *name)
> > {
> > 	struct foo_obj *foo;
> > 	int retval;
> > 
> > 	/* allocate the memory for the whole object */
> > 	foo = kzalloc(sizeof(*foo), GFP_KERNEL);
> > 	if (!foo)
> > 		return NULL;
> > 
> > 	/* initialize the kobject portion of the object properly */
> > 	kobject_set_name(&foo->kobj, "%s", name);
> 
> Returncode not checked :)

good catch.  Hm, I don't think anyone checks that function :)

> > 	foo->kobj.kset = example_kset;
> > 	foo->kobj.ktype = &foo_ktype;
> > 
> > 	/*
> > 	 * Register the kobject with the kernel, all the default files will
> > 	 * be created here and the uevent will be sent out.  If we were to
> > 	 * call kobject_init() and then kobject_add() we would be
> > 	 * responsible for sending out the initial KOBJ_ADD uevent.
> > 	 */
> > 	retval = kobject_register(&foo->kobj);
> > 	if (retval) {
> > 		kfree(foo);
> 
> kobject_put(foo) is needed since it gets you through kobject_cleanup()
> where the name can be freed.

No, kobject_register() should have handled that for us, right?

thanks,

greg k-h
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