156  *	@nb: Info about handler function to be called
157  *	@nb->priority:	Handler priority. Handlers should follow the
159  *			0:	Restart handler of last resort,
161  *			128:	Default restart handler; use if no other
162  *				restart handler is expected to be available,
165  *			255:	Highest priority restart handler, will
176  *	If more than one function is registered, the restart handler priority
182  *	restart handlers may exist; for example, one restart handler might
184  *	In such cases, the restart handler which only restarts part of the
199  *				     restart handler
202  *	Unregisters a previously registered restart handler function.
213  *	do_kernel_restart - Execute kernel restart handler call chain
220  *	Restarts the system immediately if a restart handler function has been
319 	struct sys_off_handler *handler;  in sys_off_notify()  local
322 	handler = container_of(nb, struct sys_off_handler, nb);  in sys_off_notify()
323 	data.cb_data = handler->cb_data;  in sys_off_notify()
327 	return handler->sys_off_cb(&data);  in sys_off_notify()
334 	struct sys_off_handler *handler;  in alloc_sys_off_handler()  local
338 	 * Platforms like m68k can't allocate sys_off handler dynamically  in alloc_sys_off_handler()
342 		handler = &platform_sys_off_handler;  in alloc_sys_off_handler()
343 		if (handler->cb_data)  in alloc_sys_off_handler()
351 		handler = kzalloc(sizeof(*handler), flags);  in alloc_sys_off_handler()
352 		if (!handler)  in alloc_sys_off_handler()
356 	return handler;  in alloc_sys_off_handler()
359 static void free_sys_off_handler(struct sys_off_handler *handler)  in free_sys_off_handler()  argument
361 	if (handler == &platform_sys_off_handler)  in free_sys_off_handler()
362 		memset(handler, 0, sizeof(*handler));  in free_sys_off_handler()
364 		kfree(handler);  in free_sys_off_handler()
368  *	register_sys_off_handler - Register sys-off handler
370  *	@priority: Handler priority
374  *	Registers system power-off or restart handler that will be invoked
375  *	at the step corresponding to the given sys-off mode. Handler's callback
376  *	should return NOTIFY_DONE to permit execution of the next handler in
382  *	Only one handler can be registered at the non-default priority level,
394 	struct sys_off_handler *handler;  in register_sys_off_handler()  local
397 	handler = alloc_sys_off_handler(priority);  in register_sys_off_handler()
398 	if (IS_ERR(handler))  in register_sys_off_handler()
399 		return handler;  in register_sys_off_handler()
403 		handler->list = &power_off_prep_handler_list;  in register_sys_off_handler()
404 		handler->blocking = true;  in register_sys_off_handler()
408 		handler->list = &power_off_handler_list;  in register_sys_off_handler()
412 		handler->list = &restart_prep_handler_list;  in register_sys_off_handler()
413 		handler->blocking = true;  in register_sys_off_handler()
417 		handler->list = &restart_handler_list;  in register_sys_off_handler()
421 		free_sys_off_handler(handler);  in register_sys_off_handler()
425 	handler->nb.notifier_call = sys_off_notify;  in register_sys_off_handler()
426 	handler->nb.priority = priority;  in register_sys_off_handler()
427 	handler->sys_off_cb = callback;  in register_sys_off_handler()
428 	handler->cb_data = cb_data;  in register_sys_off_handler()
429 	handler->mode = mode;  in register_sys_off_handler()
431 	if (handler->blocking) {  in register_sys_off_handler()
433 			err = blocking_notifier_chain_register(handler->list,  in register_sys_off_handler()
434 							       &handler->nb);  in register_sys_off_handler()
436 			err = blocking_notifier_chain_register_unique_prio(handler->list,  in register_sys_off_handler()
437 									   &handler->nb);  in register_sys_off_handler()
440 			err = atomic_notifier_chain_register(handler->list,  in register_sys_off_handler()
441 							     &handler->nb);  in register_sys_off_handler()
443 			err = atomic_notifier_chain_register_unique_prio(handler->list,  in register_sys_off_handler()
444 									 &handler->nb);  in register_sys_off_handler()
448 		free_sys_off_handler(handler);  in register_sys_off_handler()
452 	return handler;  in register_sys_off_handler()
457  *	unregister_sys_off_handler - Unregister sys-off handler
458  *	@handler: Sys-off handler
460  *	Unregisters given sys-off handler.
462 void unregister_sys_off_handler(struct sys_off_handler *handler)  in unregister_sys_off_handler()  argument
466 	if (IS_ERR_OR_NULL(handler))  in unregister_sys_off_handler()
469 	if (handler->blocking)  in unregister_sys_off_handler()
470 		err = blocking_notifier_chain_unregister(handler->list,  in unregister_sys_off_handler()
471 							 &handler->nb);  in unregister_sys_off_handler()
473 		err = atomic_notifier_chain_unregister(handler->list,  in unregister_sys_off_handler()
474 						       &handler->nb);  in unregister_sys_off_handler()
479 	free_sys_off_handler(handler);  in unregister_sys_off_handler()
485 	struct sys_off_handler *handler = data;  in devm_unregister_sys_off_handler()  local
487 	unregister_sys_off_handler(handler);  in devm_unregister_sys_off_handler()
491  *	devm_register_sys_off_handler - Register sys-off handler
492  *	@dev: Device that registers handler
494  *	@priority: Handler priority
498  *	Registers resource-managed sys-off handler.
508 	struct sys_off_handler *handler;  in devm_register_sys_off_handler()  local
510 	handler = register_sys_off_handler(mode, priority, callback, cb_data);  in devm_register_sys_off_handler()
511 	if (IS_ERR(handler))  in devm_register_sys_off_handler()
512 		return PTR_ERR(handler);  in devm_register_sys_off_handler()
515 					handler);  in devm_register_sys_off_handler()
520  *	devm_register_power_off_handler - Register power-off handler
525  *	Registers resource-managed sys-off handler with a default priority
542  *	devm_register_restart_handler - Register restart handler
547  *	Registers resource-managed sys-off handler with a default priority
587 	struct sys_off_handler *handler;  in register_platform_power_off()  local
589 	handler = register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,  in register_platform_power_off()
593 	if (IS_ERR(handler))  in register_platform_power_off()
594 		return PTR_ERR(handler);  in register_platform_power_off()
596 	platform_power_off_handler = handler;  in register_platform_power_off()
632  *	do_kernel_power_off - Execute kernel power-off handler call chain
636  *	Powers off the system immediately if a power-off handler function has
663  *	Returns true if power-off handler is registered and system can be