Re: [PATCH] 6700/6702PXH quirk

[Kristen Accardi]

On Fri, 2005-08-05 at 11:12 -0600, Bjorn Helgaas wrote:
> On Friday 05 August 2005 10:27 am, Kristen Accardi wrote:
> > On the 6700/6702 PXH part, a MSI may get corrupted if an ACPI hotplug
> > driver and SHPC driver in MSI mode are used together.  This patch will
> > prevent MSI from being enabled for the SHPC.  
> 
> Can you outline the scenario that causes the corruption?  This patch
> feels like a band-aid over a deeper problem.

This is a workaround to a hardware problem.  If a MSI interrupt occurs
while the ACPI driver is doing a config read of the hotplug capabilities
register, the MSI interrupt will be corrupted, and the MSI interrupt
will never make it to the MCH.  This causes the hotplug device to not be
recognized.
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