Re: [PATCH] x86, irq: Keep IRQ assignment for PCI devices during suspend/hibernation

From: Borislav Petkov
Date: Thu Jul 31 2014 - 12:56:58 EST

On Fri, Aug 01, 2014 at 12:36:59AM +0800, Jiang Liu wrote:
> 1) There's a race window between device_shutdown() and
> syscore_shutdown(). USB device may be returned to BIOS
> during device_shutdown() and IOMMU units are disabled
> during syscore_shutdown().
> 2) Printing debug messages enlarges the race window,
> especially when using serial console.
> Then it triggers warning message "AMD-Vi: Event logged [IO_PAGE_FAULT
> device=00:12.0 domain=0x0009 address=0x00000000ffffffc0 flags=0x0010]".
> But I have no AMD platforms to verify this theory. Could you
> please help to try adding delays between device_shutdown()
> and syscore_shutdown() in function kernel_power_off()?

Ok, but this whole deal started appearing only after rc6. And this
ordering hasn't been touched recently, AFAICT. So it must be something

I'm still trying to get that other system to trigger...


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