PCI: iproc: Skip check for legacy IRQ on PAXC buses

PAXC and PAXCv2 buses do not support legacy IRQs so there is no reason to
even try and map them.  Without a change like this, one cannot create VFs
on Nitro ports since legacy interrupts are checked as part of the PCI
device creation process.  Testing on PAXC hardware showed that VFs are
properly created with only the change to not set pcie->map_irq, but just to
be safe the change in iproc_pcie_setup() will ensure that pdev_fixup_irq()
will not panic.

Signed-off-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Ray Jui <ray.jui@broadcom.com>

2 files changed, 12 insertions, 2 deletions

diff --git a/drivers/pci/host/pcie-iproc-platform.c b/drivers/pci/host/pcie-iproc-platform.c
index fd3ed9bccaff..22d814a78a78 100644
--- a/drivers/pci/host/pcie-iproc-platform.c
+++ b/drivers/pci/host/pcie-iproc-platform.c
@@ -108,7 +108,14 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
                 return ret;
         }
 
-        pcie->map_irq = of_irq_parse_and_map_pci;
+        /* PAXC doesn't support legacy IRQs, skip mapping */
+        switch (pcie->type) {
+        case IPROC_PCIE_PAXC:
+        case IPROC_PCIE_PAXC_V2:
+                break;
+        default:
+                pcie->map_irq = of_irq_parse_and_map_pci;
+        }
 
         ret = iproc_pcie_setup(pcie, &res);
         if (ret)
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index cd513342b913..3ebc025499b9 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -1274,7 +1274,10 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
 
         pci_scan_child_bus(bus);
         pci_assign_unassigned_bus_resources(bus);
-        pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
+
+        if (pcie->map_irq)
+                pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
+
         pci_bus_add_devices(bus);
 
         return 0;