[linux-dvb] Re: Problems with TechnoTrend dec2000-t USB

[Holger Waechtler <holger@convergence.de>]

Alex Woods wrote:
> > > The case is, if I do
> > > ifconfig dvb0_0 promisc ,
> > > the kernel panics crying about a bug in sched.c (!).
> > That looks like the same bug i have in the ttusb-nova driver, that the
> > section handler is directly called from the (interrupt-) urb-complete
> > handler. This has to be fixed in the driver (and in the ttusb-nova too).
>
> It would be nice to have the output from ksymoops of the panic message, all 
> the same.  I have tried and failed to replicate it :(
>
> What is the nature of the problem with calling the section handler from the 
> urb complete, by the way, Felix?
please use tasklets to do the real work for your interrupt handlers. 
Take a look in the PCI drivers for an example, the pretty simple to 
convert: just schedule your tasklet with old irq handler function in the 
new irq handler.

Since tasklets are strongly serialized (if the tasklet is already 
running while a new interrupt arrives it's not scheduled again) you have 
to check at the end of your tasklet function if new data arrived and if 
you have to run it once again.

Holger



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