FYI, we noticed the below changes on

https://github.com/0day-ci/linux Robert-Baldyga/usb-gadget-composite-introduce-new-function-API/20160203-205850
commit 2203f6a8922a447a364b12ec60b0fe4d7b15a4f9 ("usb: gadget: f_acm: conversion to new API")


[    5.782015] usb 1-1: config 2 has an invalid interface number: 0 but max is -1
[    5.782015] usb 1-1: config 2 has an invalid interface number: 0 but max is -1
[    5.782018] usb 1-1: config 2 has an invalid interface number: 0 but max is -1
[    5.782018] usb 1-1: config 2 has an invalid interface number: 0 but max is -1
[    5.782020] usb 1-1: config 2 has 1 interface, different from the descriptor's value: 0
[    5.782020] usb 1-1: config 2 has 1 interface, different from the descriptor's value: 0
[    5.782023] usb 1-1: config 2 interface 0 altsetting 0 has an invalid endpoint with address 0x80, skipping
[    5.782023] usb 1-1: config 2 interface 0 altsetting 0 has an invalid endpoint with address 0x80, skipping
[    5.782025] usb 1-1: Duplicate descriptor for config 2 interface 0 altsetting 0, skipping
[    5.782025] usb 1-1: Duplicate descriptor for config 2 interface 0 altsetting 0, skipping


Thanks,
Ying Huang