This avoids duplication of USB requests for OUT endpoint and
re-enabling endpoints.
Signed-off-by: Felipe F. Tonello <e...@felipetonello.com>
---
drivers/usb/gadget/function/f_midi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/function/f_midi.c
b/drivers/usb/gadget/function/f_midi.c
index 76ea53c..615d632 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];
@@ -322,7 +323,7 @@ static int f_midi_set_alt(struct usb_function *f, unsigned
intf, unsigned alt)
int err;
/* For Control Device interface we do nothing */
- if (intf == 0)
+ 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;
--
2.5.0
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