[IA64] Properly unregister legacy interrupts

acpi_unregister_gsi() should "undo" what acpi_register_gsi() does.

On systems that have legacy interrupts, acpi_unregister_gsi erroneously calls
iosapci_unregister_intr() which is wrong to do and causes a loud warning.

acpi_unregister_gsi() should just return in these cases.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 6ff6815d34ef9166be93f4580829416a54ff7ffd..853d1f11be005f9e0b3443d8b33cdcbd72e53edd 100644 (file)
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -627,6 +627,9 @@ void acpi_unregister_gsi(u32 gsi)
        if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
                return;
 
+       if (has_8259 && gsi < 16)
+               return;
+
        iosapic_unregister_intr(gsi);
 }