The IoCompleteRequest routine indicates that the caller has completed all processing for a given I/O request and is returning the given IRP to the I/O manager.
void IoCompleteRequest( a, b );
When a driver has finished all processing for a given IRP, it calls IoCompleteRequest. The I/O manager checks the IRP to determine whether any higher-level drivers have set up an IoCompletion routine for the IRP. If so, each IoCompletion routine is called, in turn, until every layered driver in the chain has completed the IRP.
When all drivers have completed a given IRP, the I/O manager returns status to the original requester of the operation. Note that a higher-level driver that sets up a driver-created IRP must supply an IoCompletion routine to release the IRP it created.
Never call IoCompleteRequest while holding a spin lock. Attempting to complete an IRP while holding a spin lock can cause deadlocks.
|Windows version||Available starting with Windows 2000.|
|Header||wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)|
|DDI compliance rules||CompleteRequest, CompleteRequestStatusCheck, DoubleCompletion, IoAllocateComplete, IoBuildFsdComplete, IoSetCompletionExCompleteIrp, IrpProcessingComplete, MarkIrpPending, PendedCompletedRequest, PendedCompletedRequest2, PendedCompletedRequest3, PendedCompletedRequestEx, PnpIrpCompletion, SpinLockSafe, WmiComplete, HwStorPortProhibitedDDIs, SpinLockSafe(storport)|