diff options
Diffstat (limited to 'arch/x86/pci/irq.c')
| -rw-r--r-- | arch/x86/pci/irq.c | 67 |
1 files changed, 38 insertions, 29 deletions
diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c index fec0123b33a..d781cc4f725 100644 --- a/arch/x86/pci/irq.c +++ b/arch/x86/pci/irq.c @@ -1041,35 +1041,44 @@ static void __init pcibios_fixup_irqs(void) if (io_apic_assign_pci_irqs) { int irq; - if (pin) { - /* - * interrupt pins are numbered starting - * from 1 - */ - pin--; - irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, - PCI_SLOT(dev->devfn), pin); - /* - * Busses behind bridges are typically not listed in the MP-table. - * In this case we have to look up the IRQ based on the parent bus, - * parent slot, and pin number. The SMP code detects such bridged - * busses itself so we should get into this branch reliably. - */ - if (irq < 0 && dev->bus->parent) { /* go back to the bridge */ - struct pci_dev *bridge = dev->bus->self; - - pin = (pin + PCI_SLOT(dev->devfn)) % 4; - irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number, - PCI_SLOT(bridge->devfn), pin); - if (irq >= 0) - dev_warn(&dev->dev, "using bridge %s INT %c to get IRQ %d\n", - pci_name(bridge), - 'A' + pin, irq); - } - if (irq >= 0) { - dev_info(&dev->dev, "PCI->APIC IRQ transform: INT %c -> IRQ %d\n", 'A' + pin, irq); - dev->irq = irq; - } + if (!pin) + continue; + + /* + * interrupt pins are numbered starting from 1 + */ + pin--; + irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, + PCI_SLOT(dev->devfn), pin); + /* + * Busses behind bridges are typically not listed in the + * MP-table. In this case we have to look up the IRQ + * based on the parent bus, parent slot, and pin number. + * The SMP code detects such bridged busses itself so we + * should get into this branch reliably. + */ + if (irq < 0 && dev->bus->parent) { + /* go back to the bridge */ + struct pci_dev *bridge = dev->bus->self; + int bus; + + pin = (pin + PCI_SLOT(dev->devfn)) % 4; + bus = bridge->bus->number; + irq = IO_APIC_get_PCI_irq_vector(bus, + PCI_SLOT(bridge->devfn), pin); + if (irq >= 0) + dev_warn(&dev->dev, + "using bridge %s INT %c to " + "get IRQ %d\n", + pci_name(bridge), + 'A' + pin, irq); + } + if (irq >= 0) { + dev_info(&dev->dev, + "PCI->APIC IRQ transform: INT %c " + "-> IRQ %d\n", + 'A' + pin, irq); + dev->irq = irq; } } #endif |