linux-kernel - [Patch] PCI/portdrv: Remove warning about invalid IRQ

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Date:	Wed, 18 Jun 2014 13:56:21 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ryan Desfosses <ryan@...fo.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: [Patch] PCI/portdrv: Remove warning about invalid IRQ

For hot-added PCIe ports, it always generates a warning message on x86
platforms when binding to portdrv as:
	"device [8086:0e0b] has invalid IRQ; check vendor BIOS".

It's due to that we check pci_dev->irq before actually allocating IRQ
for the PCI device:
	if (!dev->irq && dev->pin) {
		dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
			 "check vendor BIOS\n", dev->vendor, dev->device);
	}
 	status = pcie_port_device_register(dev);
		-->pci_enable_device(dev);
			-->pci_enable_device_flags()
				-->do_pci_enable_device()
					-->pcibios_enable_device()
						-->pcibios_enable_irq()

This warning message isn't generated for PCIe ports present at boot time
because x86 arch code has called acpi_pci_irq_enable() in pci_acpi_init()
for each PCI device for safety.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
Hi Bjorn,
	I have rebased it onto v3.16-rc1 and changed the patch title
according to your suggestion.
Thanks!
Gerry
___
 drivers/pci/pcie/portdrv_pci.c |    4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c
index 80887eaa0668..2ccc9b926ea7 100644
--- a/drivers/pci/pcie/portdrv_pci.c
+++ b/drivers/pci/pcie/portdrv_pci.c
@@ -203,10 +203,6 @@ static int pcie_portdrv_probe(struct pci_dev *dev,
 	     (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
 		return -ENODEV;
 
-	if (!dev->irq && dev->pin) {
-		dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; check vendor BIOS\n",
-			 dev->vendor, dev->device);
-	}
 	status = pcie_port_device_register(dev);
 	if (status)
 		return status;
-- 
1.7.10.4

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