From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754408Ab0KQNBK (ORCPT ); Wed, 17 Nov 2010 08:01:10 -0500 Received: from bof-2.saar.de ([192.109.53.146]:54414 "EHLO oknodo.bof.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750722Ab0KQNBJ (ORCPT ); Wed, 17 Nov 2010 08:01:09 -0500 X-Greylist: delayed 2713 seconds by postgrey-1.27 at vger.kernel.org; Wed, 17 Nov 2010 08:01:09 EST Subject: 2.6.37-rc2 regression: usb network hotplug From: Patrick Schaaf To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Date: Wed, 17 Nov 2010 13:10:48 +0100 Message-ID: <1289995848.5034.5.camel@lat1> Mime-Version: 1.0 X-Mailer: Evolution 2.30.1.2 Content-Transfer-Encoding: 7bit X-Spam_score: -4.4 X-Spam_score_int: -43 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When trying out 2.6.37-rc2 on my Dell Latitude D630 laptop, I notice a regression, compared to plain 2.6.36, related to USB unplugging my N900 (cdc_ether network device). The usb0 interface is configured to automatically plug into a bridge group, if that matters. On 2.6.36 I can unplug and replug the device properly. Under 2.6.37-rc2, the first plugging works, the device is reachable as desired, but after unplugging it the first time, I receive the following message every 10 seconds: kernel:[ 149.632104] unregister_netdevice: waiting for usb0 to become free. Usage count = 1 The usb0 device is gone at that point. Replugging does not work. When I reboot into the same kernel, a list of "cannot reset port" messages is apparent in the boot logs, as appended. This disappears after shutting down the machine. I'll gladly try out patches that could fix this, or try out other things to help diagnose. best regards Patrick <3>[ 4.449056] usb 6-1.2: device not accepting address 3, error -71 <3>[ 4.452793] hub 6-1:1.0: cannot disable port 2 (err = -71) <3>[ 4.454787] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.456787] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.458787] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.460787] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.462786] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.464491] hub 6-1:1.0: Cannot enable port 2. Maybe the USB cable is bad? <3>[ 4.466787] hub 6-1:1.0: cannot disable port 2 (err = -71) <3>[ 4.468785] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.470786] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.472787] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.474780] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.476784] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.478261] hub 6-1:1.0: Cannot enable port 2. Maybe the USB cable is bad? <3>[ 4.479773] hub 6-1:1.0: cannot disable port 2 (err = -71) <3>[ 4.481773] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.483772] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.485778] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.487787] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.489789] hub 6-1:1.0: cannot reset port 2 (err = -71) <3>[ 4.491052] hub 6-1:1.0: Cannot enable port 2. Maybe the USB cable is bad? <3>[ 4.492788] hub 6-1:1.0: cannot disable port 2 (err = -71) <3>[ 4.494079] hub 6-1:1.0: unable to enumerate USB device on port 2 <3>[ 4.495787] hub 6-1:1.0: cannot disable port 2 (err = -71) <3>[ 4.497790] hub 6-1:1.0: hub_port_status failed (err = -71) <6>[ 4.499100] usb 6-1: USB disconnect, address 2