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-rw-r--r--drivers/usb/gadget/function/f_midi.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index 29bfca1a47bb..e804231bd8e5 100644
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -75,6 +75,7 @@ struct f_midi {
struct usb_ep *in_ep, *out_ep;
struct snd_card *card;
struct snd_rawmidi *rmidi;
+ u8 ms_id;
struct snd_rawmidi_substream *in_substream[MAX_PORTS];
struct snd_rawmidi_substream *out_substream[MAX_PORTS];
@@ -321,8 +322,8 @@ static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
unsigned i;
int err;
- /* For Control Device interface we do nothing */
- if (intf == 0)
+ /* we only set alt for MIDIStreaming interface */
+ if (intf != midi->ms_id)
return 0;
err = f_midi_start_ep(midi, f, midi->in_ep);
@@ -730,6 +731,7 @@ static int f_midi_bind(struct usb_configuration *c, struct usb_function *f)
goto fail;
ms_interface_desc.bInterfaceNumber = status;
ac_header_desc.baInterfaceNr[0] = status;
+ midi->ms_id = status;
status = -ENODEV;