From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758633AbYJWTkd (ORCPT ); Thu, 23 Oct 2008 15:40:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753804AbYJWTkZ (ORCPT ); Thu, 23 Oct 2008 15:40:25 -0400 Received: from kroah.org ([198.145.64.141]:48156 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753585AbYJWTkY (ORCPT ); Thu, 23 Oct 2008 15:40:24 -0400 Date: Thu, 23 Oct 2008 12:36:50 -0700 From: Greg KH To: "Gu, Mingkun" Cc: linux-kernel@vger.kernel.org Subject: Re: Help: undesired 10 seconds delay in creating USB devices Message-ID: <20081023193650.GB10397@kroah.com> References: <20081023161355.GA8171@kroah.com> <32C88E5279F5DD46B7237443CD61E67901E455BB@cspmail02.gtk.gtech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <32C88E5279F5DD46B7237443CD61E67901E455BB@cspmail02.gtk.gtech.com> User-Agent: Mutt/1.5.16 (2007-06-09) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 23, 2008 at 04:30:34PM -0300, Gu, Mingkun wrote: > > -----Original Message----- > > From: Greg KH [mailto:greg@kroah.com] > > Sent: Thursday, October 23, 2008 1:14 PM > > To: Gu, Mingkun > > Cc: linux-kernel@vger.kernel.org > > Subject: Re: Help: undesired 10 seconds delay in creating USB devices > > > > On Thu, Oct 23, 2008 at 01:11:00PM -0300, Gu, Mingkun wrote: > > > > Please stop sending email in HTML format, the mailing lists reject it. > > > > > [MKGU>] My device driver name is "usbled". Our USB device has > > > VendorID=11b4. After I unplugged the USB cable connecting to this > device > > > and kept the device driver "usbled" remaining loaded, I plugged in > the > > > USB cable back to the system again. I could see the device > information > > > retrieved from /proc/bus/usb/devices immediately but the device name > > > /dev/usbled0 was seen after near 10 seconds. > > > > That sounds like a udev script issue, not a kernel issue, correct? > > > > [MKGU>] Yes. It seems related to udev. > > > > > If you run 'udevadm monitor', does it show a 10 second delay? > > > > > > [MKGU>] I don't have the program 'udevadm' on my system. > > > > Do you have the program 'udevmonitor'? I suggest trying that. > > > > [MKGU>] Yes, I ran "udevmonitor" and captured the following messages: > UEVENT[1224775488.005799] remove /class/usb/usbled0 (usb) > UEVENT[1224775488.007901] remove /class/usb (class) > UEVENT[1224775488.011992] remove > /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb) > UEVENT[1224775488.019706] remove > /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb) > UEVENT[1224775496.176576] add > /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb) > UEVENT[1224775496.181732] add > /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb) > UEVENT[1224775496.186031] add /class/usb/usbled0 (usb) Then I suggest filing a bug with your distro to get this looked at, as they are responsible for the udev scripts here, nothing wrong with your kernel :) good luck, greg k-h