PCI: generic: Fix lookup of linux,pci-probe-only property

When pci-host-generic looks for the probe-only property, it seems to trust
the DT to be correctly written, and assumes that there is a parameter to
the property.

Unfortunately, this is not always the case, and some firmware expose this
property naked.  The driver ends up making a decision based on whatever the
property pointer points to, which is likely to be junk.

Switch to the common of_pci.c implementation that doesn't suffer from this
problem.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Will Deacon <will.deacon@arm.com>

1 files changed, 1 insertions, 8 deletions

diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
index 265dd25169bf..224303d2b401 100644
--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -210,7 +210,6 @@ static int gen_pci_probe(struct platform_device *pdev)
         int err;
         const char *type;
         const struct of_device_id *of_id;
-        const int *prop;
         struct device *dev = &pdev->dev;
         struct device_node *np = dev->of_node;
         struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
@@ -225,13 +224,7 @@ static int gen_pci_probe(struct platform_device *pdev)
                 return -EINVAL;
         }
 
-        prop = of_get_property(of_chosen, "linux,pci-probe-only", NULL);
-        if (prop) {
-                if (*prop)
-                        pci_add_flags(PCI_PROBE_ONLY);
-                else
-                        pci_clear_flags(PCI_PROBE_ONLY);
-        }
+        of_pci_check_probe_only();
 
         of_id = of_match_node(gen_pci_of_match, np);
         pci->cfg.ops = of_id->data;