Can't cleanly unload driver

I am trying to load/unload a basic driver skeleton. I did an insmod ./mydriver.ko , then a mknod /dev/mydriver0 c <major #> 0 , then a ln -sf mydriver0 /dev/mydriver All is well. Now to unload rmmod mydriver rm -f /dev/mydriver rm -f /dev/mydriver0 But rmmod reports Module mydriver is not currently loaded. But it is in /proc/devices: 248 mydriver Trying to reload it gives: insmod ./mydriver.ko Could not insert module mydriver.ko: File exists. I could reboot .... again ... but what is wrong? I have source for the driver, as I am developing it. WS