I patched 2.6.12 with syskonnect SK-98xx without any errors.
When I tried to compile the patched kernel...

CC drivers/net/sk98lin/skge.o
drivers/net/sk98lin/skge.c: In function `SkGeIoctl':
drivers/net/sk98lin/skge.c:4029: error: structure has no member named `slot_name'
make[3]: *** [drivers/net/sk98lin/skge.o] Error 1
make[2]: *** [drivers/net/sk98lin] Error 2
make[1]: *** [drivers/net] Error 2
make: *** [drivers] Error 2

strange all worked fine for 2.6.11.11

I have the feeling I'm stuck waiting for a new driver.