The PCI config space reseves a byte for the interrupt line, so irq 255 actually refers to 'not set'. However, the 'irq' field for struct pci_dev is an integer, so the original meaning is lost, causing the system to assign an interrupt '255', which fails.
So we should _not_ assign an interrupt value here, and allow upper layers to fixup things. This patch make PCI devices with MSI interrupts only (like the xhci device on certain HP laptops) work properly. Cc: Frederik Himpe <[email protected]> Cc: Oliver Neukum <[email protected]> Cc: David Haerdeman <[email protected]> Cc: [email protected] Cc: [email protected] Signed-off-by: Hannes Reinecke <[email protected]> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 6186f03..a2db887f 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -923,7 +923,8 @@ static void pci_read_irq(struct pci_dev *dev) dev->pin = irq; if (irq) pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); - dev->irq = irq; + if (irq < 255) + dev->irq = irq; } void set_pcie_port_type(struct pci_dev *pdev) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
