Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762145AbZJJVVp (ORCPT ); Sat, 10 Oct 2009 17:21:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758610AbZJJVVo (ORCPT ); Sat, 10 Oct 2009 17:21:44 -0400 Received: from gate.crashing.org ([63.228.1.57]:44152 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761622AbZJJVVn (ORCPT ); Sat, 10 Oct 2009 17:21:43 -0400 Subject: Re: USB serial regression 2.6.31.1 -> 2.6.31.2 From: Benjamin Herrenschmidt To: Alan Stern Cc: Josua Dietze , Ben Efros , fangxiaozhi , Greg KH , Kernel development list , USB list , Hugh Blemings In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Date: Sun, 11 Oct 2009 08:20:17 +1100 Message-Id: <1255209617.3387.9.camel@pasglop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1431 Lines: 37 On Sat, 2009-10-10 at 16:41 -0400, Alan Stern wrote: > On Sat, 10 Oct 2009, Alan Stern wrote: > > > On Sat, 10 Oct 2009, Josua Dietze wrote: > ... > > > This is one of the mode switching devices. It is switched to modem > > > mode by "usb_stor_huawei_e220_init". > > > > > > Something keeps resetting it to initial mode. It might be a > > > powersave/suspend issue. > > > > It's not related to powersave or suspend. (Although both trace files > > show that the device's remote-wakeup feature did get enabled; I have no > > idea what code was responsible for doing that. AFAIK it shouldn't > > happen unless the device is about to be suspended.) > > It turns out that the remote-wakeup enable _is_ the mode-switch > command. Don't ask me why the manufacturer decided to use an > pre-existing command to tell the device to switch modes. > > Anyway, it's clear from the logs that the mode switch worked in both > cases. Initially the device shows only one interface, and after the > mode switch it shows four. Yes, that works, you can see the ttyUSBx ports showing up. It looks like it may just be the resets coming from usb-storage that are breaking things. Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/