Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752936AbZG0QSh (ORCPT ); Mon, 27 Jul 2009 12:18:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752847AbZG0QSh (ORCPT ); Mon, 27 Jul 2009 12:18:37 -0400 Received: from iolanthe.rowland.org ([192.131.102.54]:55582 "HELO iolanthe.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751535AbZG0QSf (ORCPT ); Mon, 27 Jul 2009 12:18:35 -0400 Date: Mon, 27 Jul 2009 12:18:36 -0400 (EDT) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: Ferenc Wagner cc: "Carlos R. Mafra" , Greg KH , Alan Cox , Linux Kernel Mailing List , Kernel Testers List , USB list , Kay Sievers , "Rafael J. Wysocki" Subject: Re: [Bisected] [Bug #13821] Replugging USB serial converter uses new device node In-Reply-To: <87zlaqcec1.fsf@tac.ki.iif.hu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1511 Lines: 38 On Mon, 27 Jul 2009, Ferenc Wagner wrote: > > Are you certain this really is a regression? Under 2.6.30 and 2.6.27 > > the same thing happened if I unplugged a USB serial device while it was > > in use. > > My original report is about unplugging the USB servial device *after* > using it. > > > Can you check whether the device is still being used when you unplug > > it? For instance, is there still a pppd process trying to communicate > > with the device? > > I checked and rechecked that the pppd process is already dead by the > time I unplug the device. However, the minor number did not increase > if I unplugged the device without using it beforehand, as expected. > > > In short, it seems likely that this is not new behavior but rather the > > way usb-serial has worked all along. > > I didn't experience this problem with 2.6.30: my ppp script was > hardwired to use ttyUSB0 and it always worked. Now with 2.6.31-rc3 it > does not, as the device node keeps changing. > > I'll test this with opening ttyUSB directly from the shell, instead of > via pppd, and report back whether it makes a difference. Another thing to check is whether this patch (not yet merged) fixes it: http://marc.info/?l=linux-usb&m=124825571403844&w=2 Alan Stern -- 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/