Re: 2.5.68-mmX: Drowning in irq 7: nobody cared!

Alan Cox (alan@lxorguk.ukuu.org.uk)
06 May 2003 10:35:34 +0100


On Llu, 2003-05-05 at 22:30, Andrew Morton wrote:
> Shane Shrybman <shrybman@sympatico.ca> wrote:
> >
> > Hi,
> >
> > I am getting a lot of these in the logs. This is with the ALSA emu10k1
> > driver for a SB live card. This is a x86, UP, KT133 system with preempt
> > enabled. The system seems to be running fine.
> >
> > handlers:
> > [<d8986540>] (gcc2_compiled.+0x0/0x390 [snd_emu10k1])
> > irq 7: nobody cared!
>
> Beats me. Does this fix it up?

With APIC at least it doesnt suprise me the least. The IRQ hack seems
extremely racey. Remember on most systems (especially with PIII type
APIC) IRQ delivery is asynchronous to the bus so you get

IRQ arrives
sound card
loop
clean up IRQ
IRQ sent
still more work, do it
done
HANDLED

IRQ arrives
sound card
Umm duh no work for me
NOT HANDLED

Whine

For anything where you get pairs of close IRQ's

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