Re: amplc_pci230: spurious interrupt

On Wed, Dec 17, 2003 at 10:29:52AM +0000, Steve Sharples wrote:
> Hello there,
> 
> Um, newbie question, please be kind.
> 
> I'm using comedi-0.7.67 and comedilib-0.7.21, with a "stock" redhat kernel
> (2.4.20-24.9).
> 
> I've managed to compile and install comedi and comedilibs ok. I have an
> Amplicon PCI230 board (A/D, DIO, D/A etc) and have managed to
> comedi_config the device (after insmod-ing comedi and amplc_pci230). In
> the comedilib/demo directory, running ./info gives sensible information
> about the card:

> It doesn't take long for the /var/log/messages file to reach a _very_
> silly size indeed. :o(
> 
> I could of course remove the printk in amplc_pci230.c, but I'm generally
> of the opinion that error messages are there for a reason.

It's there for a reason, but a bogus reason.  Your card is obviously
sharing an interrupt with another device.  Replace the printk() line
with "return;" or "return IRQ_NONE;" depending on which was used in
0.7.67.

(Amusingly, I've seen this before on a machine that shared the
interrupt with the network card and also used remote logging.  So
an interrupt caused logging information to be transferred to another
computer, which caused more interrupts, ad infinitum.)



dave...

Received on 2003-12-18Z03:02:27