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PCI: generic: Claim bus resources on PCI_PROBE_ONLY set-ups
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We claim PCI BAR and bridge window resources in pci_bus_assign_resources(),
but when PCI_PROBE_ONLY is set, we treat those resources as immutable and
don't call pci_bus_assign_resources(), so the resources aren't put in the
resource tree.

When the resources aren't in the tree, they don't show up in /proc/iomem,
we can't detect conflicts, and we need special cases elsewhere for
PCI_PROBE_ONLY or resources without a parent pointer.

Claim all PCI BAR and window resources in the PCI_PROBE_ONLY case.

If a PCI_PROBE_ONLY platform assigns conflicting resources, Linux can't fix
the conflicts.  Previously we didn't notice the conflicts, but now we will,
which may expose new failures.

[bhelgaas: changelog, summarize comment]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Will Deacon <will.deacon@arm.com>
CC: Arnd Bergmann <arnd@arndb.de>
CC: David Daney <david.daney@cavium.com>
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Lorenzo Pieralisi authored and Bjorn Helgaas committed Jun 23, 2016
1 parent 765bf9b commit dcce0f1
Showing 1 changed file with 8 additions and 1 deletion.
9 changes: 8 additions & 1 deletion drivers/pci/host/pci-host-common.c
Original file line number Diff line number Diff line change
Expand Up @@ -155,7 +155,14 @@ int pci_host_common_probe(struct platform_device *pdev,

pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);

if (!pci_has_flag(PCI_PROBE_ONLY)) {
/*
* We insert PCI resources into the iomem_resource and
* ioport_resource trees in either pci_bus_claim_resources()
* or pci_bus_assign_resources().
*/
if (pci_has_flag(PCI_PROBE_ONLY)) {
pci_bus_claim_resources(bus);
} else {
pci_bus_size_bridges(bus);
pci_bus_assign_resources(bus);

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