These are small fixes the way we discover and program PCI-PCI bridge
apertures.
The first (preventing bus conflicts) was found by Jason Gunthorpe.
We wrote 0xf0 to the I/O base/limit registers, which enables the
aperture. For arches that emulate the bridge config space, this
causes the emulation to open a window we didn't expect.
The second keeps us from inadvertently clearing bits in the bridge
Secondary Status register while programming the I/O aperture. We
don't really use those status bits, but it doesn't seem like a good
thing to clear them when we didn't intend to.
---
Bjorn Helgaas (2):
PCI: Prevent bus conflicts while checking for bridge apertures
PCI: Stop clearing bridge Secondary Status when setting up I/O aperture
drivers/pci/setup-bus.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
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