sparc/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>
Acked-by: David S. Miller <davem@davemloft.net>
CC: Paul Gortmaker <paul.gortmaker@windriver.com>
CC: Yijing Wang <wangyijing@huawei.com>
CC: Sam Ravnborg <sam@ravnborg.org>
CC: sparclinux@vger.kernel.org

diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
index b36365f49478c573d715816d53582e2dfb153227..9ce5afe167ff509288b21605a2f9a35f96ff36dc 100644 (file)
--- a/arch/sparc/kernel/pci.c
+++ b/arch/sparc/kernel/pci.c
@@ -639,7 +639,10 @@ static void pci_claim_bus_resources(struct pci_bus *bus)
                                       (unsigned long long)r->end,
                                       (unsigned int)r->flags);
 
-                       pci_claim_resource(dev, i);
+                       if (pci_claim_resource(dev, i) == 0)
+                               continue;
+
+                       pci_claim_bridge_resource(dev, i);
                }
        }