[etherlab-dev] EtherCAT-Master on recent kernels

Christian Gieseler chg at alpenjodel.de
Sat Apr 11 16:46:27 CEST 2009

> > > I noticed a crash when I unload ethercat master's kernelmodule:
> > > # /etc/init.d/ethercat start
> > > .... wait a while
> > > # /etc/init.d/ethercat stop
> > > # dmesg > dmesg_beforcrash && sync
> > > .... wait another second, and the system freezes, completly... 
> > > 
> > > Any idea? Dmesg looks like everything went fine... I also let the
> > > module run for several hours, without a problem, its only on
> > > unloading.. Did I made a mistake in my driver?
> > 
> > Probably... ;-)
> > 
> > I know this from patching new drivers by myself. Try to search from
> > illegal kfree() in the exit code. My experience is, that they are the #1
> > reason for freezes.
> I changed the init script and disabled restoring of modules (this way the
> original e100 module isnt inserted after ec_e100 is removed...). That way I
> the computer doesnt crash, I can also reinsert ec_e100, use it and remove
> it again... But as soon as I insert the original e100 driver, the system
> crashs... It seems that the ec_e100 driver leaves the device in an unknown
> state.... Any idea?

I had the same problems with the e100 driver with the versions 2.6.24 and 2.6.26. I can´t provide a solution, since i solved it like you by not reloading the e100 driver, because i have no need to do this in the end version. I just wanted to inform you that it might is not a problem with the patch you made but a problem that already existed in the basic code of the 2.6.26 driver you used for updating the driver.

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