// wdm.h
VOID KeLowerIrql(
[in] KIRQL NewIrql
);
View the official Windows Driver Kit DDI referenceNo description available.
The KeLowerIrql routine restores the IRQL on the current processor to its original value. For information about IRQLs, see Managing Hardware Priorities.
NewIrql [in]Specifies the IRQL that was returned from KeRaiseIrql or KeRaiseIrqlToDpcLevel.
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.