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alpha/PCI: Clip bridge windows to fit in upstream windows 

Every PCI-PCI bridge window should fit inside an upstream bridge window
because orphaned address space is unreachable from the primary side of the
upstream bridge.  If we inherit invalid bridge windows that overlap an
upstream window from firmware, clip them to fit and update the bridge
accordingly.

[bhelgaas: changelog]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=85491
Reported-by: Marek Kordik <kordikmarek@gmail.com>
Fixes: 5b28541552 ("PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources")
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Richard Henderson <rth@twiddle.net>
CC: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
CC: Matt Turner <mattst88@gmail.com>
CC: linux-alpha@vger.kernel.org
This commit is contained in:
Yinghai Lu 2015-01-15 16:21:49 -06:00 committed by Bjorn Helgaas
parent 851b093692
commit b3e118224c
1 changed files with 6 additions and 2 deletions
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8
arch/alpha/kernel/pci.c
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@ -285,8 +285,12 @@ pcibios_claim_one_bus(struct pci_bus *b)
if (r->parent || !r->start || !r->flags)
continue;
if (pci_has_flag(PCI_PROBE_ONLY) ||
(r->flags & IORESOURCE_PCI_FIXED))
pci_claim_resource(dev, i);
(r->flags & IORESOURCE_PCI_FIXED)) {
if (pci_claim_resource(dev, i) == 0)
continue;
pci_claim_bridge_resource(dev, i);
}
}
}