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Re: why would IRQ change?

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On 03/20/11 21:14, Julian Calaby wrote:
> On Mon, Mar 21, 2011 at 12:00, James <bjlockie@xxxxxxxxx> wrote:
>> On 03/20/11 19:42, Julian Calaby wrote:
>>> On Mon, Mar 21, 2011 at 07:44, James <bjlockie@xxxxxxxxx> wrote:
>>>> Is there a tool to list what devices are assigned what IRQ?
>>>>
>>>> This from an old kernel:
>>>> ieee80211 phy0: Atheros AR5416 MAC/BB Rev:2 AR2133 RF Rev:81
>>>> mem=0xffffc900017a0000, irq=18
>>>>
>>>> This is from today:
>>>> ath9k 0000:02:09.0: PCI INT A -> Link[LNKB] -> GSI 17 (level, low) -> IRQ 17
>>>> ieee80211 phy0: Atheros AR5416 MAC/BB Rev:2 AR2133 RF Rev:81
>>>> mem=0xffffc90001ba0000, irq=17
>>> AFAIK, PCI interrupts numbers are just sequential numbers assigned by
>>> Linux - there is no significance to them, they are just a number for
>>> tracking which interrupt is assigned to which device - there is no
>>> "IRQ17" or "IRQ18" anywhere in any actual hardware.
>>>
>>> Thanks,
>>>
>> I'm thinking maybe the IRQ sharing doesn't work right with this card.
> It's a PCI card. See: http://en.wikipedia.org/wiki/Conventional_PCI#Interrupts
>
> Thanks,
>
Interesting, thanks.
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