Messages in this thread | | | Date | Sun, 1 Aug 1999 16:41:55 +0200 (CEST) | From | Eric Lammerts <> | Subject | Re: Handling interrupts from userspace |
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On Sun, 1 Aug 1999, Alan Cox wrote:
> > The interrupt handler can also disable the IRQ in the PIC. This > > will prevent further interrupts after exiting the handler. > > It doesnt work for PCI for all cases
Just because PCI cards might be sharing interrupt lines or is there any other reason?
> The card is on IRQ 9 you disable IRQ 9 you return to user space. IRQ 9 is shared with the > disk. You do a disk I/O. Goodbye computer
It's true you can't do shared interrupts with my driver. But it'll never try that: It requests the interrupt without SA_SHIRQ so your scenario could never happen. You just get -EBUSY when you open the device and the interrupt happens to be in use.
Eric
-- Eric Lammerts <eric@scintilla.utwente.nl>
"Don't you know there ain't no devil? There's just God when he's drunk." -- Tom Waits
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