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

[Felix Domke <tmbinc@elitedvb.net>]

Hi,

> > 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?
The problem is that you shouldn't call the underlaying dvb handlers (the 
soft demux etc.) in an interrupt context, since there are some locks and 
so on missing. At least the net-driver assumes that he is not called in 
an interrupt context, most probably because of a kmalloc or something 
like this. i haven't checked it yet.

The problem is that the completion handler from the iso-transfer is 
called out of the ohci/uhci/... interrupt, thus in an interrupt context.

felix




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