4 files changed, 65 insertions, 3 deletions

diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index f35c6eb33da9..6bb80ea5f4ee 100644
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -962,7 +962,7 @@ static int EISA_ELCR(unsigned int irq)
 #define default_MCA_trigger(idx)        (1)
 #define default_MCA_polarity(idx)       (0)
 
-static int __init MPBIOS_polarity(int idx)
+static int MPBIOS_polarity(int idx)
 {
         int bus = mp_irqs[idx].mpc_srcbus;
         int polarity;
@@ -2830,6 +2830,25 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
         return 0;
 }
 
+int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
+{
+        int i;
+
+        if (skip_ioapic_setup)
+                return -1;
+
+        for (i = 0; i < mp_irq_entries; i++)
+                if (mp_irqs[i].mpc_irqtype == mp_INT &&
+                    mp_irqs[i].mpc_srcbusirq == bus_irq)
+                        break;
+        if (i >= mp_irq_entries)
+                return -1;
+
+        *trigger = irq_trigger(i);
+        *polarity = irq_polarity(i);
+        return 0;
+}
+
 #endif /* CONFIG_ACPI */
 
 static int __init parse_disable_timer_pin_1(char *arg)
diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index 953328b55a30..435a8c9b55f8 100644
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -546,7 +546,7 @@ int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
 #define default_PCI_trigger(idx)        (1)
 #define default_PCI_polarity(idx)       (1)
 
-static int __init MPBIOS_polarity(int idx)
+static int MPBIOS_polarity(int idx)
 {
         int bus = mp_irqs[idx].mpc_srcbus;
         int polarity;
@@ -2222,8 +2222,27 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int p
         return 0;
 }
 
-#endif /* CONFIG_ACPI */
 
+int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
+{
+        int i;
+
+        if (skip_ioapic_setup)
+                return -1;
+
+        for (i = 0; i < mp_irq_entries; i++)
+                if (mp_irqs[i].mpc_irqtype == mp_INT &&
+                    mp_irqs[i].mpc_srcbusirq == bus_irq)
+                        break;
+        if (i >= mp_irq_entries)
+                return -1;
+
+        *trigger = irq_trigger(i);
+        *polarity = irq_polarity(i);
+        return 0;
+}
+
+#endif /* CONFIG_ACPI */
 
 /*
  * This function currently is only a helper for the i386 smp boot process where
@@ -2260,3 +2279,4 @@ void __init setup_ioapic_dest(void)
         }
 }
 #endif
+
diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c
index 0e3b8d0ff06b..11adab13f2b7 100644
--- a/drivers/pnp/pnpacpi/rsparser.c
+++ b/drivers/pnp/pnpacpi/rsparser.c
@@ -75,6 +75,7 @@ static void pnpacpi_parse_allocated_irqresource(struct pnp_resource_table *res,
 {
         int i = 0;
         int irq;
+        int p, t;
 
         if (!valid_IRQ(gsi))
                 return;
@@ -85,6 +86,23 @@ static void pnpacpi_parse_allocated_irqresource(struct pnp_resource_table *res,
         if (i >= PNP_MAX_IRQ)
                 return;
 
+        /*
+         * in IO-APIC mode, use overrided attribute. Two reasons:
+         * 1. BIOS bug in DSDT
+         * 2. BIOS uses IO-APIC mode Interrupt Source Override
+         */
+        if (!acpi_get_override_irq(gsi, &t, &p)) {
+                t = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
+                p = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
+
+                if (triggering != t || polarity != p) {
+                        pnp_warn("IRQ %d override to %s, %s",
+                                gsi, t ? "edge":"level", p ? "low":"high");
+                        triggering = t;
+                        polarity = p;
+                }
+        }
+
         res->irq_resource[i].flags = IORESOURCE_IRQ;    // Also clears _UNSET flag
         res->irq_resource[i].flags |= irq_flags(triggering, polarity);
         irq = acpi_register_gsi(gsi, triggering, polarity);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 8ccedf7a0a5a..e3c16c981e46 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -132,6 +132,11 @@ extern unsigned long acpi_realmode_flags;
 int acpi_register_gsi (u32 gsi, int triggering, int polarity);
 int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
 
+#ifdef CONFIG_X86_IO_APIC
+extern int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity);
+#else
+#define acpi_get_override_irq(bus, trigger, polarity) (-1)
+#endif
 /*
  * This function undoes the effect of one call to acpi_register_gsi().
  * If this matches the last registration, any IRQ resources for gsi