linux-kernel - RE: [char-misc-next 05/11] mei: bus: Call bus routines from the core code

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Date:	Thu, 7 Feb 2013 22:57:28 +0000
From:	"Winkler, Tomas" <tomas.winkler@...el.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [char-misc-next 05/11] mei: bus: Call bus routines from the
 core code



> -----Original Message-----
> From: Arnd Bergmann [mailto:arnd@...db.de]
> Sent: Friday, February 08, 2013 00:38
> To: Winkler, Tomas
> Cc: gregkh@...uxfoundation.org; sameo@...ux.intel.com; linux-
> kernel@...r.kernel.org
> Subject: Re: [char-misc-next 05/11] mei: bus: Call bus routines from the core
> code
> 
> On Thursday 07 February 2013, Tomas Winkler wrote:
> > @@ -197,6 +197,9 @@ static int mei_probe(struct pci_dev *pdev, const
> struct pci_device_id *ent)
> >         mei_pdev = pdev;
> >         pci_set_drvdata(pdev, dev);
> >
> > +       err = mei_bus_init(mei_pdev);
> > +       if (err)
> > +               goto deregister_mei;
> >
> >         schedule_delayed_work(&dev->timer_work, HZ);
> >
> 
> This is fairly unusual, and will break if you ever have multiple mei devices in
> one system, because you end up registering the bus type for each device. I
> think it would be more logical to register/unregister the bus_type from the
> module_init/exit functions of the module that contains the bus_type object.

MEI is a singleton and it is enforced also in software in the probe 

Second why to register anything if the MEI device is not present on the system. 

Thanks
Tomas

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