[PATCH] handle fadt->si_cmd == 0

In reading the spec, it looks like if a particular ACPI implementation
leaves fadt->si_cmd equal to 0, that means the platform doesn't support
system management mode, which seems legal.  I needed this patch for my
system.  With the patch applied, I'm able to see /proc/acpi and the
interpreter appears to start.  Is this legal?

Thanks,
Jesse

--- /usr/tmp/TmpDir.30375-0/linux/drivers/acpi/hardware/hwacpi.c_1.10	Fri Jun  6 10:24:23 2003
+++ linux/drivers/acpi/hardware/hwacpi.c	Tue Jun  3 10:48:31 2003

@@ -180,6 +180,10 @@
 
 	ACPI_FUNCTION_TRACE ("Hw_get_mode");
 
+	/* If there's no smi_cmd port, then it's ACPI only hw */
+	if (!acpi_gbl_FADT->smi_cmd)
+		return_VALUE (ACPI_SYS_MODE_ACPI);
+
 	status = acpi_get_register (ACPI_BITREG_SCI_ENABLE, &value, ACPI_MTX_LOCK);
 	if (ACPI_FAILURE (status)) {
 		return_VALUE (ACPI_SYS_MODE_LEGACY);


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