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Subject[PATCH v2] of_pci_irq: Silence bogus "of_irq_parse_pci() failed ..." messages.
Date
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);
+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);
}
--
1.7.11.7


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