I can remember having patches accepted to the following files in mainline: 
MAINTAINERS
drivers/net/rrunner.c
drivers/net/acenic.c
drivers/net/ncr53cxxx.c (replaced by yellowfin.c)
drivers/net/yellowfin.c
drivers/net/tulip/*
drivers/serial/serial_core.c
net/ipv4/tcp.c
arch/ppc/platforms/gemini*
arch/ppc/kernel/head.S
arch/ppc/{I can't remember it all - I was a maintainer}
fs/ext2/balloc.c
fs/ext2/bitmap.c
fs/ext2/ialloc.c
fs/ext2/Makefile
My memory being what it is, I am sure there are more.