Handling a System Set-Power IRP in a Bus Driver
When a bus driver receives a system set-power IRP, it must take the following steps:
Call PoStartNextPowerIrp to start the next power IRP. (Windows Server 2003, Windows XP, and Windows 2000 only.)
Set Irp->IoStatus.Status to STATUS_SUCCESS. The driver cannot fail a system set-power IRP.
Call IoCompleteRequest, specifying IO_NO_INCREMENT, to complete the IRP.
The bus driver does not change device power settings until it receives a power IRP that requests a device power state.
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