Mixman DM2 on Linux; SPIN_LOCK_UNLOCKED

Since I got a Mixman DM2 and like to run Linux I decided to put the two together. Slight hassle, though, the kernel doesn't sit still while you're not watching. A slight tweak is needed to get the driver to work on a modern kernel; in my case, 3.0.0-14-generic on Ubuntu.

I got an error about SPIN_LOCK_UNLOCK being deprecated, and that led me to google around until I found a nice kerneltrap blog entry on solutions for SPIN_LOCK_UNLOCKED errors. One of these was appropriate to the current case:

2. allocating a data structure dynamically & initializing the spinlock embedded within use spin_lock_init() e.g linux-core/via_dmablit.c

- blitq->blit_lock = SPIN_LOCK_UNLOCKED; 
+ spin_lock_init(&blitq->blit_lock);

So naturally I applied the same detail to the code. So here's the actual how-to.

Install the sources
You're going to need to install module-assistant before you can install the driver source package.
Unpack the sources
Visit /usr/src and sudo tar xvfj dm2.tar.bz2 which will produce a modules directory. You could back up dm2.tar.bz2 in case you make a mistake.
Edit the offending file
You want to edit modules/dm2/dm2.c at line 991. replace dev->lock = SPIN_LOCK_UNLOCKED; with spin_lock_init(&dev->lock);
Regenerate the source archive
sudo tar cvfj dm2.tar.bz2 modules
Build the driver
sudo m-a a-i dm2-source
Plug in the Mixman

LEDs should flash. If not, please come back and leave a comment. My current goal is to use the unit with Mixxx... TBC