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

From: Brown, Len
Date: Tue Jul 26 2005 - 00:49:09 EST

>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.


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