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When host capabilities check failed or when we were unable to register doorbell bitmap we were forgetting to set error code and were returning 0 which would make upper layers believe that probe was successful. Reported-by: Julia Lawall <julia.lawall@lip6.fr> Acked-by: Andy King <acking@vmware.com> Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>