CmUnRegisterCallback - NtDoc
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headers
// wdm.h
NTSTATUS CmUnRegisterCallback(
[in] LARGE_INTEGER Cookie
);
View the official Windows Driver Kit DDI referenceNo description available.
The CmUnRegisterCallback routine unregisters a RegistryCallback routine that a CmRegisterCallback or CmRegisterCallbackEx routine previously registered.
Cookie [in]A LARGE_INTEGER value that identifies the callback routine to unregister. CmRegisterCallback provided this value when you registered the callback routine.
CmUnRegisterCallback returns STATUS_SUCCESS if it succeeds or the appropriate NTSTATUS error code if it fails. If the Cookie parameter does not match any registered callback routines, CmUnRegisterCallback returns STATUS_INVALID_PARAMETER.
A driver that calls CmRegisterCallback or CmRegisterCallbackEx should call CmUnRegisterCallback before the driver is unloaded.
A driver must not call CmUnRegisterCallback from its implementation of the RegistryCallback routine. That call will result in a deadlock.
For more information about CmUnRegisterCallback and filtering registry operations, see Filtering Registry Calls.