Nice, torille!
I also got my first and so far only kernel patch submitted years ago:
On my MacBook Pro 2010 with GeForce 320M running any OpenGL application, even glxgears, would crash because it ran out of memory. So I dug into nouveau drm code and found out that some memory related function was using wrong code path for that GPU.
It took some time to figure out how to submit a patch but it felt nice after I got it accepted.
I didn't even know about those patch sanity-checking scripts back then, they look useful for potential future patches!