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: 5b28541552ef ("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

diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c
index 076c35cd6cde7c2d782a46fe3942b8962369230e..98a1525fa164df0178fd4cb5fc0267129b2844e3 100644 (file)
--- a/arch/alpha/kernel/pci.c
+++ b/arch/alpha/kernel/pci.c
@@ -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);
+                       }
                }
        }