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NDIS_LOWER_IRQL (Compact 2013)

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3/26/2014

This macro sets the IRQL on the current processor to the specified value.

Syntax

NDIS_LOWER_IRQL((_OldIrql_, _CurIrql_))

Parameters

  • _OldIrql_
    The original (that is, unraised) IRQL value from before the driver called the NDIS_RAISE_IRQL_TO_DISPATCH macro. NDIS_LOWER_IRQL sets the IRQL to this value.
  • _CurIrql_
    The current IRQL value that is active before the call to NDIS_LOWER_IRQL.

Return Value

None

Remarks

NDIS network drivers should use the NDIS_LOWER_IRQL macro to restore the IRQL setting that existed before a call to the NDIS_RAISE_IRQL_TO_DISPATCH macro.

If the value that the _OldIrql_ parameter specifies is not equal to the current IRQL, the NDIS_LOWER_IRQL macro tries to lower the IRQL to the value that the _OldIrql_ parameter specifies.

It is a fatal error to call NDIS_LOWER_IRQL and use a value for _OldIrql_ that was not returned from an immediately preceding call to the NDIS_RAISE_IRQL_TO_DISPATCH macro.

NDIS_LOWER_IRQL is an NDIS wrapper for the KeLowerIrql routine.

Requirements

Header

ndis.h

See Also

Reference

NDIS Interrupt and Synchronization Macros
NDIS_RAISE_IRQL_TO_DISPATCH