drm.ko and mach64.ko cause kernel panic after drm release 2.4.1

[Mitch]

Hello,

I'm subscribing to this ML to report a regression in a (admittedly very 
old) DRM module: the mach64.ko module, when loaded with latest git 
drm.ko module, causes kernel panics with kernels 2.6.24, 2.6.27, 2.6.28, 
and 2.6.29 with Xorg servers 1.4, 1.5 and 1.6, when the server loads (it 
MIGHT, in some cases, show the mouse cursor); dmesg doesn't show any 
error when I insert the module manually.
 I think it must be a regression in drm.ko (since mach64 code has sat 
untouched for quite a while now), for now the most recent working gitweb 
snapshot I've tested as working (chosen arbitrarily, as I don't feel 
like doing all bisects and I'm no C programmer anyway) is this one: 
http://cgit.freedesktop.org/mesa/drm/commit/?id=00847dabe0fa5ccf796658f486e8f6f7a77e043b
I'll try and pinpoint more precisely which commit broke mach64 - as 
although the driver is gathering dust, there are still a few that use it 
out there. I'd appreciate some help though, and I can test any patch at 
any time (I have two working Mach64-equipped machines at my disposal).

Thanks,

Mitch Meyran