Re: Problem with hotplug-2001_01_16 + quick solution

[David Brownell <david-b@pacbell.net>]

Martin --

Thanks for that problem report for 2.2 hotplugging!


> My USB mouse (Genius Netmouse Pro) has PRODUCTE8/2/0.0
                                                       ^^^
> (DEVICE=/proc/bus/usb/001/002, INTERFACE=3/1/2, TYPE not set)
> in kernel 2.2.19pre6, so usb.agent aborts its execution
> in usb_convert_vars function. In the kernel 2.4.0 it is OK.

Greg, that looks like hotplug in 2.2.* needs to get a bugfix
from a few months back -- changing the product version code
to be straight hex, not a BCD-ized string.  Can you get that
fix to Alan?  (A case of ripping out ugly to_bcd code ... :-)


> With modutils 2.4.1 the file /lib/modules/`uname -r`/modules.usbmap
> exists even in the 2.2 kernel, but contains only one line, so usb.distmap
> is not used.

Looks like modutils is not going to ensure that file only exists
on kernels that support MODULE_DEVICE_TABLE sections in dynamically
linked modules.  I'll check in a fix (this AM) that will test the
kernel version.

(So Keith, that means you needn't bother tweaking modutils to
avoid generating empty "modules.usbmap" files.)

For the record, I hate testing software version stamps, because
that's known to be a fragile scheme.  Feature tests are reliable,
but we don't seem to have a way to test "do modules on this system
support MODULE_DEVICE_TABLE" -- so "is kernel version 2.4/2.5/..."
is the best heuristic I can identify.

- Dave




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