StorPortInitializeDpc & PASSIVE_LEVEL

WDK claims:

“The StorPortInitializeDpc routine must be called during HBA initialization
from within the miniport driver’s HwStorPassiveInitializeRoutine routine.”

What’s the point to call StorPortInitializeDpc this way?
StorPortInitializeDpc is a wrapper over KeInitializeDpc, that can be called
at any IRQL

TIA
Andrew