c7e27a0c93
Though there is no direct midi_uninit() caller amongst existing drivers at this moment, a quick experiment indicates that EBUSY gives users more precise error message once drivers start to honour this result. For example, emu_midi_detach() should check the result of mpu401_uninit() and block module unloading if there is any MIDI I/O in progress. MFC after: 2 weeks