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