of_pci_irq: Silence bogus "of_irq_parse_pci() failed ..." messages.

It is perfectly legitimate for a PCI device to have an
PCI_INTERRUPT_PIN value of zero.  This happens if the device doesn't
use interrupts, or on PCIe devices, where only MSI/MSI-X are
supported.

Silence the annoying "of_irq_parse_pci() failed with rc=-19" error
messages by moving the printing code into of_irq_parse_pci(), and only
emitting the message for cases where PCI_INTERRUPT_PIN == 0 is not the
cause for an early exit.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Rob Herring <robh@kernel.org>

diff --git a/drivers/of/of_pci_irq.c b/drivers/of/of_pci_irq.c
index 1710d9dc7fc2e304b10e414bdab24e5329609387..2306313c0029a095c1fefa6b7b5eb0ff28f1cf9c 100644 (file)
--- a/drivers/of/of_pci_irq.c
+++ b/drivers/of/of_pci_irq.c
@@ -38,8 +38,8 @@ int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq
         */
        rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);
        if (rc != 0)
-               return rc;
-       /* No pin, exit */
+               goto err;
+       /* No pin, exit with no error message. */
        if (pin == 0)
                return -ENODEV;
 
@@ -53,8 +53,10 @@ int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq
                        ppnode = pci_bus_to_OF_node(pdev->bus);
 
                        /* No node for host bridge ? give up */
-                       if (ppnode == NULL)
-                               return -EINVAL;
+                       if (ppnode == NULL) {
+                               rc = -EINVAL;
+                               goto err;
+                       }
                } else {
                        /* We found a P2P bridge, check if it has a node */
                        ppnode = pci_device_to_OF_node(ppdev);
@@ -86,7 +88,13 @@ int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq
        out_irq->args[0] = pin;
        laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8));
        laddr[1] = laddr[2] = cpu_to_be32(0);
-       return of_irq_parse_raw(laddr, out_irq);
+       rc = of_irq_parse_raw(laddr, out_irq);
+       if (rc)
+               goto err;
+       return 0;
+err:
+       dev_err(&pdev->dev, "of_irq_parse_pci() failed with rc=%d\n", rc);
+       return rc;
 }
 EXPORT_SYMBOL_GPL(of_irq_parse_pci);
 
@@ -105,10 +113,8 @@ int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin)
        int ret;
 
        ret = of_irq_parse_pci(dev, &oirq);
-       if (ret) {
-               dev_err(&dev->dev, "of_irq_parse_pci() failed with rc=%d\n", ret);
+       if (ret)
                return 0; /* Proper return code 0 == NO_IRQ */
-       }
 
        return irq_create_of_mapping(&oirq);
 }