From: Bjorn Helgaas <bjorn.helgaas@hp.com>

Move the "only do this once" stuff from acpi_register_gsi() into
eisa_set_level().
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>