Ludovic Rousseau wrote:
Hello
I am trying replace the active polling of the USB bus in pcscd by a
udev event. I see that OpenCT has a udev rule file etc/openct.udev
that starts the script etc/openct_usb.
This etc/openct_usb script does:
[...]
# race condition in the kernel, $DEVICE might not exist now
sleep 1
[...]
I also have the same problem with udev. The event is sent before the
device is really present in /sys/ and then pcscd do not see it :-(
udev provides the WAIT_FOR_SYSFS="foo" option and is documented as:
WAIT_FOR_SYSFS
Wait for the specified sysfs file of the device to be created. Can
be used to fight against kernel sysfs timing issues.
So I use WAIT_FOR_SYSFS="dev" in my udev file but the rule is executed
6 seconds after the reader is plugged in. Not nice for a hotplug
mechanism.
I also have two lines in /var/log/daemon.log:
Oct 23 16:02:55 neo udevd-event[14830]: wait_for_sysfs: waiting for
'/sys/devices/pci0000:00/0000:00:1d.1/usb2/2-2/2-2.3/dev' failed
Oct 23 16:02:59 neo udevd-event[14832]: wait_for_sysfs: waiting for
'/sys/devices/pci0000:00/0000:00:1d.1/usb2/2-2/2-2.3/2-2.3:1.0/dev'
failed
Am I doing something wrong?
The rules I see show WAIT_FOR_SYSFS="bus" sounds like
you may bew waiting on the wrong syslink I see in the log
after pluging in a reader for
/sys/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/bus
where bus is a symlink to ../../../../../../bus/usb.
You might also get more info from the log if you set the
/etc/udev/udev.conf udev_log="debug"
or use the command udevcontrol log_print=7
to change it dynamicly, then look in the logs to see what else it says.
This was on Ubuntu Edgy, with udev-093-0ubuntu18
I am using udev 079-0ubuntu34 (Ubuntu Dapper). Is this corrected in a
newer version of udev? (latest version is 100)
Any udev expert here?
Thanks,
--
Douglas E. Engert <[EMAIL PROTECTED]>
Argonne National Laboratory
9700 South Cass Avenue
Argonne, Illinois 60439
(630) 252-5444
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