28143-iomarkirppending-must-return-statuspending.md

title	description	keywords	ms.date	f1_keywords
C28143 Warning	Warning C28143 A dispatch routine that calls IoMarkIrpPending must also return STATUS_PENDING.	warnings listed WDK PREfast for Drivers errors listed WDK PREfast for Drivers	04/20/2017	C28143

C28143

warning C28143: A dispatch routine that calls IoMarkIrpPending must also return STATUS_PENDING

A dispatch routine that calls IoMarkIrpPending includes at least one path in which the driver returns a value other than STATUS_PENDING.

Example

The following code example elicits this warning.

IoMarkIrpPending(Irp);
...
return STATUS_SUCCESS;

The following code example avoids this warning.

IoMarkIrpPending(Irp);
...
return STATUS_PENDING;