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We may choose to load the module without the hardware present. That will register the pci driver but since probe will not succeed so dgnc_NumBoards will be 0. Now if we unload the module then the pci driver stays registered as dgnc_NumBoards is 0. And if we try to load the module again it fails with the error: "Driver 'dgnc' is already registered." Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>