Calling ExSetTimerResolution While Processing a Power IRP

During the processing of an IRP_MJ_POWER request, the power manager holds a lock on a resource that ExSetTimerResolution must acquire to complete. Consequently, a deadlock will occur if a driver directly or indirectly calls this routine while processing a power request, and then waits for the call to the routine to return before the driver completes the power request. While processing a power request, a driver can safely call ExSetTimerResolution only if the driver does not wait for the call to this routine to return before completing the power request. For example, a driver can create a worker thread that calls ExSetTimerResolution, as long as the driver then completes the power request without waiting for the call to this routine to return.