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udev regression with hid input devices

DISCUSSION Anssi Hannula 1 participant 2 messages Jan 17, 2007 – Jan 19, 2007

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Anssi Hannula

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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_REVISION03
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.

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Anssi Hannula


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author
#1 lore raw
Quoted 26 lines · 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_REVISION03
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:

Quoted 8 lines
# 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.

Signature · 12 lines
Anssi Hannula


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