StorPortPoFxActivateComponent function (storport.h)

The StorPortPoFxActivateComponent routine increments the activation reference count on the specified component of a storage device.

Syntax

ULONG StorPortPoFxActivateComponent(
  [in]           PVOID               HwDeviceExtension,
  [in, optional] PSTOR_ADDRESS       Address,
  [in, optional] PSCSI_REQUEST_BLOCK Srb,
  [in]           ULONG               Component,
  [in]           ULONG               Flags
);

Parameters

[in] HwDeviceExtension

A pointer to the hardware device extension for the host bus adapter (HBA).

[in, optional] Address

The address of a storage device unit. This parameter is NULL when activating a storage adapter component.

[in, optional] Srb

The SRB triggering the component activation. This parameter is NULL if the miniport is activating a device component for a request not sent through Storport.

[in] Component

The index that identifies the component. This parameter is an index into the Components array in the STOR_POFX_DEVICE structure that the miniport driver registered for the device with a call to StorPortInitializePoFxPower. If the Components array contains N elements, component indexes range from 0 to N–1.

[in] Flags

Not used. Set to 0.

Return value

The StorPortPoFxActivateComponent routine returns one of these status codes:

Return code	Description
STOR_STATUS_SUCCESS	The storage device activation reference was successfully incremented and the component is in the active state.
STOR_STATUS_INVALID_PARAMETER	Either HwDeviceExtension or Device is NULL. -or- Address points to an invalid unit address structure. -or- The storage device specified by Address is not found. -or- The storage device is not registered with the power management framework (PoFx). -or- The SRB pointed to by Srb is not sent from Storport. -or- The Flags parameter is nonzero.
STOR_STATUS_INVALID_DEVICE_REQUEST	The adapter or unit does not support PoFx.
STOR_STATUS_INVALID_IRQL	The current IRQL > DISPATCH_LEVEL.
STOR_STATUS_BUSY	The storage device activation reference was successfully incremented but the component is still in the idle state

Remarks

Currently, both adapter devices and unit devices have maximum component count of 1. The index in Component must always be set to 0.

Each call to StorPortPoFxActivateComponent must be matched with a subsequent call to StorPortPoFxIdleComponent.

Requirements

Requirement	Value
Minimum supported client	Available in starting with Windows 8.
Target Platform	Universal
Header	storport.h
Library	Storport.lib
IRQL	IRQL <= DISPATCH_LEVEL

See also

STOR_POFX_DEVICE

StorPortInitializePoFxPower

StorPortPoFxIdleComponent