Re: [RFC] New Driver Model for 2.5

[Alan Cox]

> Now, I'm not sure what would happen with RAID. If we need to have logical
> volumes be child of the sd "client", then we have to face the fact that
> a given child may have multiple parents... welcome to the power graph !
> But do we really need logical volumes to be part of the PM tree or
> can blocking of requests at the sd layer be enough ? Remember we are
> in pass2, we have already done memory allocation, we are supposed to
> no longer swap nor do any disk/storage related activity.

Assuming you want to synchronize the raid before suspend - a reasonably
policy but not essential then you'd have to shut down the raid before
sd, then sd would let the devices shut down which lets the controller
shutdown