On Fri, Feb 14, 2014 at 11:00:31PM +0000, Stuart Yoder wrote:
> 
> 
> > -----Original Message-----
> > From: Greg KH [mailto:[email protected]]
> > Sent: Friday, February 14, 2014 4:27 PM
> > To: Antonios Motakis
> > Cc: [email protected]; [email protected];
> > [email protected]; [email protected];
> > [email protected]; [email protected]; Yoder Stuart-
> > B08248; [email protected]; [email protected];
> > [email protected]; Bhushan Bharat-R65777; Wood Scott-B07421;
> > [email protected]; [email protected]; Sethi Varun-B16395;
> > [email protected]; Tejun Heo; Rafael J. Wysocki; Guenter Roeck; Toshi
> > Kani; Joe Perches; Dmitry Kasatkin; Michal Hocko; Bjorn Helgaas
> > Subject: Re: [RFC PATCH v4 01/10] driver core: export
> > driver_probe_device()
> > 
> > On Sat, Feb 08, 2014 at 06:29:31PM +0100, Antonios Motakis wrote:
> > > From: Kim Phillips <[email protected]>
> > >
> > > Needed by drivers, such as the vfio platform driver [1], seeking to
> > > bypass bind_store()'s driver_match_device(), and bind to any device
> > > via a private sysfs bind file.
> > >
> > > [1] https://lkml.org/lkml/2013/12/11/522
> > >
> > > note: the EXPORT_SYMBOL is needed because vfio-platform can be built
> > > as a module.
> > 
> > No code outside of drivers/base/ should be calling this function
> 
> Why?  driver_probe_device() allows a driver to explicitly bind
> to a specific device.   What is conceptually wrong with allowing
> that?

Because that's not how a bus should work, and the fact that no other
subsystem in the kernel does that might be a hint you are trying to do
something a bit "wrong" here.

greg k-h
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