The KeLowerIrql routine restores the IRQL on the current processor to its original value. For information about IRQLs, see Managing Hardware Priorities.
void KeLowerIrql( KIRQL NewIrql );
It is a fatal error to call KeLowerIrql using an input NewIrql that was not returned by the immediately preceding call to KeRaiseIrql or KeRaiseIrqlToDpcLevel.
|Minimum supported client||Available starting with Windows 2000.|
|Header||wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)|
|DDI compliance rules||IrqlKeRaiseLower, IrqlKeRaiseLower2, HwStorPortProhibitedDDIs|