From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758577AbYJWTuF (ORCPT ); Thu, 23 Oct 2008 15:50:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752729AbYJWTty (ORCPT ); Thu, 23 Oct 2008 15:49:54 -0400 Received: from nf-out-0910.google.com ([64.233.182.189]:50216 "EHLO nf-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752610AbYJWTty (ORCPT ); Thu, 23 Oct 2008 15:49:54 -0400 Message-ID: Date: Thu, 23 Oct 2008 21:49:51 +0200 From: "Kay Sievers" To: "Greg KH" Subject: Re: Help: undesired 10 seconds delay in creating USB devices Cc: "Gu, Mingkun" , linux-kernel@vger.kernel.org In-Reply-To: <20081023193650.GB10397@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20081023161355.GA8171@kroah.com> <32C88E5279F5DD46B7237443CD61E67901E455BB@cspmail02.gtk.gtech.com> <20081023193650.GB10397@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 23, 2008 at 21:36, Greg KH wrote: > 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 :) You don't have UDEV[...] events here? The interesting output of udevmonitor would the timing difference between the kernel events and the udev events, but you completely miss the udev ones. What version of udev, and which distro is that? Kay