linux-kernel - Re: Help: undesired 10 seconds delay in creating USB devices

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Message-ID: <20081023193650.GB10397@kroah.com>
Date:	Thu, 23 Oct 2008 12:36:50 -0700
From:	Greg KH <greg@...ah.com>
To:	"Gu, Mingkun" <Mingkun.Gu@...CH.COM>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Help: undesired 10 seconds delay in creating USB devices

On Thu, Oct 23, 2008 at 04:30:34PM -0300, Gu, Mingkun wrote:
> > -----Original Message-----
> > From: Greg KH [mailto:greg@...ah.com]
> > Sent: Thursday, October 23, 2008 1:14 PM
> > To: Gu, Mingkun
> > Cc: linux-kernel@...r.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
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