Messages in this thread | | | Date | Thu, 23 Oct 2008 12:36:50 -0700 | From | Greg KH <> | Subject | Re: Help: undesired 10 seconds delay in creating USB devices |
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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
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