sound: usb-audio: make the MotU Fastlane work again

[safe/jmp/linux-2.6] / sound / usb / usbmidi.c

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 26bad37..2fb35cc 100644 (file)
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -1778,8 +1778,18 @@ int snd_usb_create_midi_interface(struct snd_usb_audio* chip,
                umidi->usb_protocol_ops = &snd_usbmidi_novation_ops;
                err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
                break;
-       case QUIRK_MIDI_RAW:
+       case QUIRK_MIDI_FASTLANE:
                umidi->usb_protocol_ops = &snd_usbmidi_raw_ops;
+               /*
+                * Interface 1 contains isochronous endpoints, but with the same
+                * numbers as in interface 0.  Since it is interface 1 that the
+                * USB core has most recently seen, these descriptors are now
+                * associated with the endpoint numbers.  This will foul up our
+                * attempts to submit bulk/interrupt URBs to the endpoints in
+                * interface 0, so we have to make sure that the USB core looks
+                * again at interface 0 by calling usb_set_interface() on it.
+                */
+               usb_set_interface(umidi->chip->dev, 0, 0);
                err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
                break;
        case QUIRK_MIDI_EMAGIC: