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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 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 5147CC433FF for ; Wed, 14 Aug 2019 13:08:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3134F21721 for ; Wed, 14 Aug 2019 13:08:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727971AbfHNNIA (ORCPT ); Wed, 14 Aug 2019 09:08:00 -0400 Received: from mx2.suse.de ([195.135.220.15]:38716 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726365AbfHNNH6 (ORCPT ); Wed, 14 Aug 2019 09:07:58 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id CA611AFE1; Wed, 14 Aug 2019 13:07:57 +0000 (UTC) Message-ID: <1565788073.25764.8.camel@suse.com> Subject: Re: AW: Strange behaviour of D-Link DUB-1312 USB 3.0 Adapters From: Oliver Neukum To: "Schmid, Carsten" , "f.fainelli@gmail.com" Cc: "linux-usb@vger.kernel.org" Date: Wed, 14 Aug 2019 15:07:53 +0200 In-Reply-To: References: <1565771508.25764.3.camel@suse.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.6 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Am Mittwoch, den 14.08.2019, 08:56 +0000 schrieb Schmid, Carsten : > > This is on a lower layer than ax88179. This comes from xhci_hcd. > > Is this a regression? > > > > I don't think its a regression. It would be better to know than to assume. > Is there something i can do to force an error message to be seen > when the ETH2USB adapter stalls? You can activate dynamic debugging for the xhci_hcd module Remember that no data to transfer is not an error as such. > My current assumption is that the signal quality of the USB port is at a > corner case, and therefore some "better" Adapters work, some "bad ones" > don't. But as there is no error message seen in the dmesg, i am somehow lost. Two things you can do: 1. Generate a usbmon trace (it will be gigantic though) 2. Activate dynamic debugging for the xhci_hcd module Regards Oliver