[POWERPC] ps3: always make sure were running on a PS3

Add missing checks to PS3 specific drivers ps3av and sys-manager to verify that
we are actually running on a PS3 (pointed out by Arnd).

Correct existing checks in other subsystems/drivers to return -ENODEV instead
of zero.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

arch/powerpc/platforms/ps3/mm.c

···
 	unsigned long nr_pages;
 
 	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
-		return 0;
+		return -ENODEV;
 
 	BUG_ON(!mem_init_done);
 

arch/powerpc/platforms/ps3/system-bus.c

···
 	int result;
 
 	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
-		return 0;
+		return -ENODEV;
 
 	result = bus_register(&ps3_system_bus_type);
 	BUG_ON(result);

drivers/ps3/ps3av.c

···
 #include <linux/reboot.h>
 #include <linux/kernel.h>
 #include <linux/ioctl.h>
+
+#include <asm/firmware.h>
 #include <asm/lv1call.h>
 #include <asm/ps3av.h>
 #include <asm/ps3.h>
···
 
 static int ps3av_module_init(void)
 {
-	int error = ps3_vuart_port_driver_register(&ps3av_driver);
+	int error;
+
+	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
+		return -ENODEV;
+
+	error = ps3_vuart_port_driver_register(&ps3av_driver);
 	if (error) {
 		printk(KERN_ERR
 		       "%s: ps3_vuart_port_driver_register failed %d\n",

drivers/ps3/sys-manager.c

···
 #include <linux/module.h>
 #include <linux/workqueue.h>
 #include <linux/reboot.h>
+
+#include <asm/firmware.h>
 #include <asm/ps3.h>
+
 #include "vuart.h"
 
 MODULE_AUTHOR("Sony Corporation");
···
 
 static int __init ps3_sys_manager_init(void)
 {
+	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
+		return -ENODEV;
+
 	return ps3_vuart_port_driver_register(&ps3_sys_manager);
 }
 

drivers/ps3/vuart.c

···
 	pr_debug("%s:%d:\n", __func__, __LINE__);
 
 	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
-		return 0;
+		return -ENODEV;
 
 	init_MUTEX(&vuart_bus_priv.probe_mutex);
 	result = bus_register(&ps3_vuart_bus);