Re: unclean yanking out of device?

[Greg KH <greg@kroah.com>]

On Wed, Jan 14, 2004 at 04:36:29PM -0800, David Brownell wrote:
> >>>That pci controller needs to tell the OS that it is going to shut down
> >>>that pci slot.  Otherwise that pci controller violates the PCI spec.
> >>
> >>I was only half-joking about the cosmic ray.  The cosmic ray violated 
> >>the PCI spec.  boo hoo.  Now what?  Tell it to go back to the supernova 
> >>it came from?
> >
> >
> >No, tell the driver that it is going to be shut down.  The driver will
> >do so, and then you can safely yank it out.  That's what all pci hotplug
> >controller drivers do, why be different?
> 
> Actually there's a good argument that every PCI driver for hardware that
> can be packaged onto CardBus _should_ handle those "unclean" shutdown
> modes ... and as Linus has observed, it's awfully convenient that most
> such cases also cause reads from those devices to return all-ones!
> 
> The electrical details are of course a different issue.  Cardbus and
> the various other kinds of PCI hotplug have different answers, so
> there's no universal guarantee that drivers will get notified first.

Yes, but even cardbus notifies the driver that the device is now gone,
which is the main point I was trying to make.  We already have the
framework for this to work properly with all PCI devices and drivers,
let's not go try to make up a new one.

thanks,

greg k-h


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