4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alberto Aguirre <albaguirre@xxxxxxxxx> [ Upstream commit 17f08b0d9aafccdb10038ab6dbd9ddb6433c13e2 ] The Axe-Fx II implicit feedback end point and the data sync endpoint are in different interface descriptors. Add quirk to ensure a sync endpoint is properly configured. Signed-off-by: Alberto Aguirre <albaguirre@xxxxxxxxx> Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- sound/usb/pcm.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -348,6 +348,16 @@ static int set_sync_ep_implicit_fb_quirk alts = &iface->altsetting[1]; goto add_sync_ep; + case USB_ID(0x2466, 0x8003): + ep = 0x86; + iface = usb_ifnum_to_if(dev, 2); + + if (!iface || iface->num_altsetting == 0) + return -EINVAL; + + alts = &iface->altsetting[1]; + goto add_sync_ep; + } if (attr == USB_ENDPOINT_SYNC_ASYNC && altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&