From: Matthew Wilcox <redacted>
Date: Sat, 29 May 2010 19:24:01 -0600

We should probably set the interrupt type back to pin-based before the
kexec kernel starts, right?  Or do we expect drivers to handle being
initialised with the device still set to MSI mode?

The expectation is that the device comes up in INTX mode, which is the
default after a PCI reset.

Basically all of these issues tend to be about the fact that unlike on
a normal boot, after a kexec an intermediate PCI reset has not occured.