From: Matthew Wilcox <matthew@wil.cx>
Date: Wed, 16 Jul 2008 13:58:53 -0600

quoted text
> David's clearly talking about devices which don't support mask bits.
> For these devices, we call
>                         msi_set_enable(entry->dev, !flag);
> 
> which turns off the PCI_MSI_FLAGS_ENABLE bit.  I'm not sure I see the
> bit in the PCI spec that says devices are then allowed to ignore the
> Interrupt Disable bit in the device control register, but I concede such
> devices may be out there.

Keep in mind also the msi intx disable bug we already have
workarounds for.  It shows that there are tons of questionable
behavior in this area.

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