In the **** BOLD **** sentence below. What exactly are they trying to
say? What are the "agents"? Does this mean
EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL also participates in the
DisconnectController() call and can reject it some how? Or is the "agent"
the application/process/whatever and it shuts it down or they are closed
down cleanly?
----
EFI 1.10 Extension
The extension to this service directly addresses the limitations described
in the section above. There may be some drivers that are currently
consuming the protocol interface that needs to be uninstalled, so it may be
dangerous to just blindly remove a protocol interface from the system.
Since the usage of protocol interfaces is now being tracked for components
that use the OpenProtocol() and CloseProtocol() boot services, a safe
version of this function can be implemented. Before the protocol interface
is removed, an attempt is made to force all the drivers that are consuming
the protocol interface to stop consuming that protocol interface. This is
done by calling the boot service DisconnectController() for the driver that
currently have the protocol interface open with an attribute of
EFI_OPEN_PROTOCOL_BY_DRIVER or EFI_OPEN_PROTOCOL_BY_DRIVER |
EFI_OPEN_PROTOCOL_EXCLUSIVE.
If the disconnect succeeds, then those agents will have called the boot
service CloseProtocol() to release the protocol interface.* *** Lastly, all
of the agents that have the protocol interface open with an attribute of
EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL, EFI_OPEN_PROTOCOL_GET_PROTOCOL, or
EFI_OPEN_PROTOCOL_TEST_PROTOCOL are closed.* *** If there are any agents
remaining that still have the protocol interface open, the protocol
interface is not removed from the handle and EFI_ACCESS_DENIED is returned.
In addition, all of the drivers that were disconnected with the boot
service DisconnectController() earlier, are reconnected with the boot
service ConnectController(). If there are no agents remaining that are
consuming the protocol interface, then the protocol interface is removed
from the handle as described above.
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