Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755313AbZJJIEW (ORCPT ); Sat, 10 Oct 2009 04:04:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754047AbZJJIEU (ORCPT ); Sat, 10 Oct 2009 04:04:20 -0400 Received: from gate.crashing.org ([63.228.1.57]:37890 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753936AbZJJIER (ORCPT ); Sat, 10 Oct 2009 04:04:17 -0400 Subject: Re: USB serial regression 2.6.31.1 -> 2.6.31.2 From: Benjamin Herrenschmidt To: Josua Dietze Cc: Greg KH , Alan Stern , "linux-kernel@vger.kernel.org" , "linux-usb@vger.kernel.org" , Hugh Blemings In-Reply-To: <4AD03A03.5050702@draisberghof.de> References: <1255134315.2139.8.camel@pasglop> <4AD03A03.5050702@draisberghof.de> Content-Type: text/plain; charset="UTF-8" Date: Sat, 10 Oct 2009 18:41:01 +1100 Message-Id: <1255160461.3387.4.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: 1077 Lines: 29 On Sat, 2009-10-10 at 09:38 +0200, Josua Dietze wrote: > Benjamin Herrenschmidt schrieb: > > > > The symptom is that the USB modem just disconnects/reconnects in a loop. > > The log looks like what I pasted below when plugging the device (and > > leaving it in, the disconnects don't correspond to the device being > > removed). > > > 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. suspend is a good candidate yeah, autosuspend might be causing something like that, I'll see what I can find. I didn't spot an obvious change to the USB suspend policy between those two kernels, but it could be trigged by one of the numerous changes that went into usb-serial. 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/