From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263733AbVBCSn4 (ORCPT ); Thu, 3 Feb 2005 13:43:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263678AbVBCSlE (ORCPT ); Thu, 3 Feb 2005 13:41:04 -0500 Received: from epithumia.math.uh.edu ([129.7.128.2]:49863 "EHLO epithumia.math.uh.edu") by vger.kernel.org with ESMTP id S263698AbVBCSjz (ORCPT ); Thu, 3 Feb 2005 13:39:55 -0500 To: howarth@bromo.msbb.uc.edu (Jack Howarth) Cc: alan@lxorguk.ukuu.org.uk, linux-kernel@vger.kernel.org Subject: Re: usb hotplug problems with 2.6.10 References: <20050203150310.65CB71DC09A@bromo.msbb.uc.edu> From: Jason L Tibbitts III Date: Thu, 03 Feb 2005 12:39:29 -0600 In-Reply-To: <20050203150310.65CB71DC09A@bromo.msbb.uc.edu> (Jack Howarth's message of "Thu, 3 Feb 2005 10:03:10 -0500 (EST)") Message-ID: User-Agent: Gnus/5.1006 (Gnus v5.10.6) XEmacs/21.4 (Security Through Obscurity, linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org >>>>> "JH" == Jack Howarth writes: JH> Alan, I had mentioned a couple weeks back that with kernel 2.6.10, JH> the ability to hotplug usb keys in Fedora Core 2 and 3 has been JH> broken. The true issue is a little more complicated than that. The kernel issue here is that under 2.6.9 (or Red Hat's versions thereof) usb-storage devices would be picked up by the SCSI layer immediately after the usb-storage module became aware of them. Under Red Hat's 2.6.10 (which currently includes -ac11) there is a delay of five or ten seconds between the device appearing in /sys/bus/usb/drivers/usb-storage and it showing up as a SCSI device. This delay has broken some stuff. Yes, Red Hat's userland hotplugging bits made incorrect assumptions and should be fixed. The question is whether this kernel delay is intended and, if not, how to fix it. Even after I've hacked around the userland problems I still have people asking why it takes so long for their USB keys to show up. - J<