udev regression with hid input devices

[Anssi Hannula <anssi.hannula@gmail.com>]

With a multi-interface USB HID devices (i.e. my keyboards and
radio-remote receivers), on 2.6.17:

# udevinfo -q all -n /dev/input/event4
P: /class/input/input6/event4
N: input/event4
S: input/by-path/pci-0000:00:10.0-usb-0:1:1.1-event-
E: ID_VENDOR=Logitech
E: ID_MODEL=USB_Receiver
E: ID_REVISION\x0103
E: ID_SERIAL=Logitech_USB_Receiver
E: ID_TYPE=hid
E: ID_BUS=usb
E: ID_PATH=pci-0000:00:10.0-usb-0:1:1.1

And on 2.6.20-rc4 (output from different host):

# udevinfo -q all -n /dev/input/event3
P: /class/input/input3/event3
N: input/event3
S: input/by-path/pci-1-1--event-
E: ID_SERIAL=noserial
E: ID_PATH=pci-1-1-

I found the following difference, possibly related:

# readlink -f /sys/class/input/input6/event4/device
/sys/devices/pci0000:00/0000:00:10.0/usb2/2-1/2-1:1.1

# readlink -f /sys/class/input/input3/event3/device
/sys/devices/pci0000:00/0000:00:10.0/usb1/1-1

On the older working kernel, device/ symlink points to the interface
directory, which contains, among other files, the critical modalias file.

-- 
Anssi Hannula


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