On Mon, 13 Sep 2010 12:07:19 +0200, Shérab said:

> +static int iris_init(void)
> +{
> +	unsigned char status = inb(IRIS_GIO_INPUT);
> +	if (status == IRIS_GIO_NODEV) {
> +		printk(KERN_ERR "This machine does not seem to be an Iris. Power_off handler not installed.\n");
> +		return -ENODEV;
> +	}

Is it actually safe to assume that this will do the right thing on a machine that
is a non-Iris that has something *else* at that I/O  address?  Any further sanity
checking we can do?  (For that matter, are there machines that will get indigestion
at this sort of unexpected inb() access?)