RE: fix suspend/resume irq request free for yenta..

[Brown, Len]

>On Sat, Jul 23, 2005 at 02:29:24AM +0200, Pavel Machek wrote:
>> > Is it necessary to do free_irq for suspend? Shouldn't disable_irq
>> > be enough?
>> 
>> Due to recent changes in ACPI, yes, it is neccessary.
>
>What if some other driver is sharing the IRQ, and requires IRQs to be
>enabled for the resume to complete?

IRQ sharing is an excellent example, not a counter-example,
of why it is necessary to disable devices and free IRQs
on suspend, and acquire them again on resume.

eg. if a device is suspended, but the hardware still causes
an interrupt on a shared IRQ, another device can
suffer a screaming IRQ failure.

Documentation/power/pci.txt has as much as we know about
how to address this -- but I'm certainly open to suggestions
on how to be less invasive to the drivers while having some
chance of being robust.

thanks,
-Len

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/