udev regression with hid input devices

udev regression with hid input devices

[Anssi Hannula]

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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Re: udev regression with hid input devices

[Anssi Hannula]

Anssi Hannula wrote:
> 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.

It seems this is indeed the culprit here, and that the change is done in
the HID split by Jiri Kosina, probably accidentally.

I will write a patch to fix this, test it and send it to the relevant
parties.


-- 
Anssi Hannula


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