Re: Xen Virtual Keyboard modalias breaking uevents

[Phillip Susi <phill@xxxxxxxxxxxx>]

It appears that input/input.c is responsible for the insane modalias
length.  If I am reading input_print_modalias() correctly, it appends a
"k" plus every key code that the keyboard supports, and the Xen Virtual
Keyboard supports a lot of keycodes.  Why does it do this?

Phillip Susi writes:

> So I have finally drilled down to the modalias for the Xen Virtual
> Keyboard driver being so long ( over 2KB ) that it causes an -ENOMEM
> when trying to add it to the environment for uevents.  This causes
> coldplug to fail, which causes the script doing coldplug as part of the
> debian-installer init to fail, which causes a kernel panic when init
> exits, which then for reasons I have yet to understand, causes the Xen
> domU to reboot.
>
> Why is this modalias so huge?  Can we pare it down, or or is there
> another solution to get uevents working on this device again?  Maybe the
> environment block size needs to be increased?  I don't know.