Subject: systemsim console hack

From: Jens Osterkamp <jens@de.ibm.com>
The systemsim (fss) hvc console ops should not be registered
when not running under the simulator. So far this has been prevented
by the presence of the rtas tokens but if these are no longer
there the driver will issue a callthru in read_ and/or write_console
even when not running under simulator and this ends up in a program
check.

Signed-off-by: Jens Osterkamp <jens@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

Index: linux-sdk2.1/drivers/char/hvc_fss.c
===================================================================
--- linux-sdk2.1.orig/drivers/char/hvc_fss.c
+++ linux-sdk2.1/drivers/char/hvc_fss.c
@@ -99,6 +99,10 @@ static int __init hvc_fss_init(void)
 {
 	struct hvc_struct *hp;
 
+	/* Don't register if we aren't running on the simulator */
+	if (!of_find_node_by_path("/mambo"))
+		return -ENODEV;
+
 	/* Allocate an hvc_struct for the console device we instantiated
 	 * earlier.  Save off hp so that we can return it on exit */
 	hp = hvc_alloc(hvc_fss_cookie, NO_IRQ, &hvc_fss_get_put_ops, 16);