linux-kernel - Re: [PATCH 0/4, v7] PCI, ACPI: Physical PCI slot objects

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Date:	Mon, 3 Mar 2008 21:56:03 -0800
From:	Greg KH <gregkh@...e.de>
To:	Alex Chiang <achiang@...com>, Gary Hade <garyhade@...ibm.com>,
	kaneshige.kenji@...fujitsu.com, warthog19@...lescrag.net,
	Matthew Wilcox <matthew@....cx>, kristen.c.accardi@...el.com,
	rick.jones2@...com, linux-kernel@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 0/4, v7] PCI, ACPI: Physical PCI slot objects

On Mon, Mar 03, 2008 at 04:35:56PM -0700, Alex Chiang wrote:
> * Greg KH <gregkh@...e.de>:
> > On Thu, Feb 28, 2008 at 05:23:41PM -0700, Alex Chiang wrote:
> > > 
> > > I did turn on kobject debugging, and all seems well except for
> > > one little thing. I based my module (pci_slot) on acpiphp, and
> > > the kobject system complains:
> > > 
> > > kobject: 'acpiphp' (a00000020476aed0): does not have a release()
> > > function, it is broken and must be fixed.
> > > 
> > > kobject: 'pci_slot' (a000000204791e50): does not have a release()
> > > function, it is broken and must be fixed.
> > > 
> > > Not quite sure what to do about these yet, but since no one has
> > > fixed acpiphp yet, I'm thinking that I can't be *too* wrong. :)
> > 
> > Um, the obvious solution of providing a release function for these
> > kobjects is somehow not correct?
> > 
> > Please do that, otherwise the code is wrong (and yes, acpiphp might be
> > wrong as well, I haven't seen that report yet.)
> 
> Hrm, maybe this is a false alarm? Those messages appear when
> doing an rmmod <foo>. Turns out you get those messages for lots
> of modules, for instance, uhci_ucd:

No, they are correct, and need to be fixed.

> kobject: 'uhci_hcd' (a00000020427c8d0): kobject_cleanup
> kobject: 'uhci_hcd' (a00000020427c8d0): does not have a release() function, it is broken and must be fixed.
> kobject: 'uhci_hcd' (a00000020427c8d0): auto cleanup 'remove' event
> kobject: 'uhci_hcd' (a00000020427c8d0): kobject_uevent_env
> kobject: 'uhci_hcd' (a00000020427c8d0): fill_kobj_path: path = '/module/uhci_hcd'
> kobject: 'uhci_hcd' (a00000020427c8d0): auto cleanup kobject_del
> kobject: 'uhci_hcd': free name
> 
> Are you saying that modules that call module_init/module_exit are
> supposed to supply a release() function?

No, the module core needs to do this, as that is the owner of this
kobject, not the module author.

I'll add it to my todo list :(

thanks,

greg k-h
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