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SubjectRe: [PATCH v2] of_pci_irq: Silence bogus "of_irq_parse_pci() failed ..." messages.
Second attempt at this reply.  The first reply was mangled.

On 9/8/2015 11:28 AM, David Daney wrote:
> From: David Daney <david.daney@cavium.com>
>
> 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>
> ---
> Changes in v2: Move the print function in to of_irq_parse_pci() at a
> common error exit point (as suggested by Frank Rowand).
>
>
> drivers/of/of_pci_irq.c | 17 ++++++++++-------
> 1 file changed, 10 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/of/of_pci_irq.c b/drivers/of/of_pci_irq.c
> index 1710d9d..0be8b65 100644
> --- 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);
> @@ -87,6 +89,9 @@ int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq
> 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);

should be:

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 +110,8 @@ 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);
> }
>



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