From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 08D55C33CA9 for ; Mon, 13 Jan 2020 15:16:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D2315207E0 for ; Mon, 13 Jan 2020 15:16:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728558AbgAMPQW (ORCPT ); Mon, 13 Jan 2020 10:16:22 -0500 Received: from comms.puri.sm ([159.203.221.185]:44816 "EHLO comms.puri.sm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726399AbgAMPQV (ORCPT ); Mon, 13 Jan 2020 10:16:21 -0500 Received: from localhost (localhost [127.0.0.1]) by comms.puri.sm (Postfix) with ESMTP id 61E96DFBE2; Mon, 13 Jan 2020 07:16:20 -0800 (PST) Received: from comms.puri.sm ([127.0.0.1]) by localhost (comms.puri.sm [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CUhCz00skZzb; Mon, 13 Jan 2020 07:16:19 -0800 (PST) To: Felipe Balbi Cc: "gregkh@linuxfoundation.org" , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" From: Martin Kepplinger Subject: g_multi rmmod problem: usb_put_function_instance(fi_acm) hangs Autocrypt: addr=martin.kepplinger@puri.sm; keydata= mQINBFULfZABEADRxJqDOYAHfrp1w8Egcv88qoru37k1x0Ugy8S6qYtKLAAt7boZW+q5gPv3 Sj2KjfkWA7gotXpASN21OIfE/puKGwhDLAySY1DGNMQ0gIVakUO0ji5GJPjeB9JlmN5hbA87 Si9k3yKQQfv7Cf9Lr1iZaV4A4yjLP/JQMImaCVdC5KyqJ98Luwci1GbsLIGX3EEjfg1+MceO dnJTKZpBAKd1J7S2Ib3dRwvALdiD7zqMGqkw5xrtwasatS7pc6o/BFgA9GxbeIzKmvW/hc3Q amS/sB12BojyzdUJ3TnIoAqvwKTGcv5VYo2Z+3FV+/MJVXPo8cj2vmfxQx1WG4n6X0pK4X8A 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uV2Xzgbi3VEbw3GZr+EnDC7XNE2wUrnlD/w2W6RzVYjVT6IX4SamNlV+MWX0/1fYCutfqZl8 6BSKmJjlWpfkPKzyzjhGQVZrTZYnKAu471hRv8/6Dx5JuZJgDCnYanNx3DDreRMu/nq6TfaO ekMtxgNYb/8oDry09UFHbGHLsWn6oBo= Message-ID: Date: Mon, 13 Jan 2020 16:16:15 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org hi, on the librem5 with defconfig https://source.puri.sm/martin.kepplinger/linux-next/blob/next-20200110/librem5_cpuidle_mainline_atf/arch/arm64/configs/librem5_defconfig running next-20200110 I load g_multi during startup. rmmod g_multi results in error like [ 190.995685] dwc3 38100000.usb: timed out waiting for SETUP phase or [ 109.702545] dwc3 38100000.usb: failed to enable ep0out and hangs rmmod. What "fixes" the problem is the following change below. Does that make any sense to you? How would a real fix look like here, or how would I further debug? thanks, martin --- a/drivers/usb/gadget/legacy/multi.c +++ b/drivers/usb/gadget/legacy/multi.c @@ -459,7 +459,8 @@ static int multi_unbind(struct usb_composite_dev *cdev) #ifdef USB_ETH_RNDIS usb_put_function(f_acm_rndis); #endif - usb_put_function_instance(fi_acm); + /* FIXME the following hangs during rmmod */ + // usb_put_function_instance(fi_acm); #ifdef USB_ETH_RNDIS usb_put_function(f_rndis); usb_put_function_instance(fi_rndis);