Re: [RFC] New Driver Model for 2.5

Linus Torvalds
2001-10-25T09:31:44Z

On 25 Oct 2001, Eric W. Biederman wrote:
>
> Or another fun common one. To shut down the interrupt controller, I first
> need to shut down every device that thinks it can generate interrupts.
> But my interrupt controller is way out on my pci->isa bridge. So I
> can't shut that device down.
>
> Sorry this whole device tree idea for shutdown ordering doesn't seem
> to match my idea of reality.

Your _examples_ do not match any reality.

Don't worry about things like the CPU shutdown: you have to have special
code for it anyway.

Let's face it, the device tree is for _devices_. It's for shutting down a
network card before we shut down the PCI bridge that is in front of it.

The issue of "core shutdown" is not covered - and isn't _meant_ to be
covered. That's the problem of the architecture-specific code. There is no
point in having a device tree for that, because it's going to be very much
architecture-specific anyway (ie on x86 we may have to just blindly trust
some silly APCI table data etc).

Linus