timeout error with USB scanner, udev and hotplug

timeout error with USB scanner, udev and hotplug

[Christian Becke]

Hi all, 

I tried to set up my epson scanner with udev, hotplug and libusb, so no
device node in /dev needs to be created as the scanner is accessed via
the entry in /proc/bus/usb/. I set up an entry in
/etc/hotplug/usb.usermap to execute a script in /etc/hotplug/usb/ that
changed the permissions of the node in /proc/bus/usb/ to give users
access to the scanner. For debugging purposes the script logged
execution via syslog.
Hotplugging the scanner worked just fine, node got created, hotplug
changed the permissions and I saw the log message. But when I try to
access the scanner with sane-scanimage or iscan the command fails and I
get the following errors in my syslog:

usb 1-2: bulk timeout on ep1in
usbfs: USBDEVFS_BULK failed dev 2 ep 0x81 len 1 ret -110

And before these errors I get 6 log lines of my hotplug-script.

So in my understanding somehow hotplug treats it as a hotplug event when
the scanner is accessed?

When I disable hotplug and let udev handle hotplug events, the scanner
works just fine (have to change permissions in /proc/bus/usb/ manually,
though), so I think this is hotplug related.

Any hints on how to fix or to more deeply debug this?

TIA
-- 
Christian Becke <christianbecke@web.de>


system setup:

VIA KT 600 chipset (w/ USB 2.0)

gentoo-linux-2.6.4
hotplug-2004_03_11
udev-021
libusb-0.1.8
iscan-1.6.1
sane-frontends-1.0.11
sane-backends-1.0.13




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