IoFreeController function (ntddk.h)
The IoFreeController routine releases a previously allocated controller object when the driver has completed an I/O request.
Syntax
void IoFreeController(
[in] PCONTROLLER_OBJECT ControllerObject
);
Parameters
[in] ControllerObject
Pointer to the driver's controller object, which was allocated for the current I/O operation on a particular device by calling IoAllocateController.
Return value
None
Remarks
The connection between the current target device object and the controller object is released only if no requests are currently queued to the same device. Otherwise, the driver's ControllerControl routine is called with the next IRP bound through the device controller to the target device.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available starting with Windows 2000. |
| Target Platform | Universal |
| Header | ntddk.h (include Ntddk.h) |
| Library | NtosKrnl.lib |
| DLL | NtosKrnl.exe |
| IRQL | DISPATCH_LEVEL |
| DDI compliance rules | HwStorPortProhibitedDDIs(storport), IrqlDispatch(storport), IrqlDispatch(storport), IrqlDispatch(wdm) |