Messages in this thread | | | Subject | RE: fix suspend/resume irq request free for yenta.. | Date | Tue, 26 Jul 2005 01:44:42 -0400 | From | "Brown, Len" <> |
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>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
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