[vdr] Re: LIRCd+serial and kernel panics

[Wolfgang Fritz <wolfgang.fritz@gmx.net>]

Richard Walker wrote:
> Hi all,
>
> I know this isn't strictly VDR, but it's my VDR system that the problem is
> affecting!  :-)
>
> I'm using Debian GNU/Linux 3 (woody) and Linux 2.4.20 (stock).  I have the
> CVS DVB drivers supporting my Nova-t, the Dxr3 drivers supporting my Dxr3,
> and VDR 1.1.21 working.  I built LIRC from CVS, and this works with the
> serial port receiver I bought from zapway.de
>
> However, lately, I've been getting kernel panics.  In fact, lots of them. 
> I thought LIRCd was causing them, but now I realise that it's the serial
> driver that came with LIRC.
I have a similar setup: SuSE 8.0 with stock kernel 2.4.20. I am using 
lirc-0.6.6 with a homemade serial receiver (schematic from www.lirc.org) 
and the lirc_serial kernel module. This is working without problems up 
to now.

> Has anyone come across anything like this before?  Could be be 2.4.20 that
> disagrees with LIRC?  Might my long serial cable (12m!) be a problem?
Maybe the lirc from CVS has a bug? You could try lirc-0.6.6 which works 
for me.

The lirc_serial driver seems to generate an interrupt for every signal 
change on the serial line. Maybe it is possible to "overflow" the kernel 
 or the lirc_serial module with interrupts which then causes a kernel 
panic. That could happen if the long cable distorts the signal or picks 
up a lot of noise, but I think in that case lirc would not work at all.

Did you try disable the "normal" serial driver with
setserial /dev/ttyS0 uart none
if it is compiled into the kernel?

Wolfgang

>



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