If an ACPI PCI-PCI bridge doesn't have a _PRT object, fall back to using

the swizzle method for routing PCI interrupts across the bridge.  This
fixes problems with motherboards (typically laptops) whose BIOS doesn't
provide a PRT for the AGP bridge even though there is a device entry for
the bridge in the ACPI namespace.

Tested by:	Kenneth Culver culverk at sweetdreamsracing dot biz

1 files changed, 9 insertions, 1 deletions

diff --git a/sys/dev/acpica/acpi_pcib_pci.c b/sys/dev/acpica/acpi_pcib_pci.c
index 7ea0b5d..e7ef8e3 100644
--- a/sys/dev/acpica/acpi_pcib_pci.c
+++ b/sys/dev/acpica/acpi_pcib_pci.c
@@ -165,5 +165,13 @@ acpi_pcib_pci_route_interrupt(device_t pcib, device_t dev, int pin)
     struct acpi_pcib_softc *sc;
 
     sc = device_get_softc(pcib);
-    return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt));
+
+    /*
+     * If we don't have a _PRT, fall back to the swizzle method
+     * for routing interrupts.
+     */
+    if (sc->ap_prt.Pointer == NULL)
+	    return (pcib_route_interrupt(pcib, dev, pin));
+    else
+	    return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt));
 }