157  *	@nb: Info about handler function to be called
158  *	@nb->priority:	Handler priority. Handlers should follow the
160  *			0:	Restart handler of last resort,
162  *			128:	Default restart handler; use if no other
163  *				restart handler is expected to be available,
166  *			255:	Highest priority restart handler, will
177  *	If more than one function is registered, the restart handler priority
183  *	restart handlers may exist; for example, one restart handler might
185  *	In such cases, the restart handler which only restarts part of the
200  *				     restart handler
203  *	Unregisters a previously registered restart handler function.
214  *	do_kernel_restart - Execute kernel restart handler call chain
221  *	Restarts the system immediately if a restart handler function has been
320 	struct sys_off_handler *handler;  in sys_off_notify()  local
323 	handler = container_of(nb, struct sys_off_handler, nb);  in sys_off_notify()
324 	data.cb_data = handler->cb_data;  in sys_off_notify()
328 	return handler->sys_off_cb(&data);  in sys_off_notify()
335 	struct sys_off_handler *handler;  in alloc_sys_off_handler()  local
339 	 * Platforms like m68k can't allocate sys_off handler dynamically  in alloc_sys_off_handler()
343 		handler = &platform_sys_off_handler;  in alloc_sys_off_handler()
344 		if (handler->cb_data)  in alloc_sys_off_handler()
352 		handler = kzalloc(sizeof(*handler), flags);  in alloc_sys_off_handler()
353 		if (!handler)  in alloc_sys_off_handler()
357 	return handler;  in alloc_sys_off_handler()
360 static void free_sys_off_handler(struct sys_off_handler *handler)  in free_sys_off_handler()  argument
362 	if (handler == &platform_sys_off_handler)  in free_sys_off_handler()
363 		memset(handler, 0, sizeof(*handler));  in free_sys_off_handler()
365 		kfree(handler);  in free_sys_off_handler()
369  *	register_sys_off_handler - Register sys-off handler
371  *	@priority: Handler priority
375  *	Registers system power-off or restart handler that will be invoked
376  *	at the step corresponding to the given sys-off mode. Handler's callback
377  *	should return NOTIFY_DONE to permit execution of the next handler in
383  *	Only one handler can be registered at the non-default priority level,
395 	struct sys_off_handler *handler;  in register_sys_off_handler()  local
398 	handler = alloc_sys_off_handler(priority);  in register_sys_off_handler()
399 	if (IS_ERR(handler))  in register_sys_off_handler()
400 		return handler;  in register_sys_off_handler()
404 		handler->list = &power_off_prep_handler_list;  in register_sys_off_handler()
405 		handler->blocking = true;  in register_sys_off_handler()
409 		handler->list = &power_off_handler_list;  in register_sys_off_handler()
413 		handler->list = &restart_prep_handler_list;  in register_sys_off_handler()
414 		handler->blocking = true;  in register_sys_off_handler()
418 		handler->list = &restart_handler_list;  in register_sys_off_handler()
422 		free_sys_off_handler(handler);  in register_sys_off_handler()
426 	handler->nb.notifier_call = sys_off_notify;  in register_sys_off_handler()
427 	handler->nb.priority = priority;  in register_sys_off_handler()
428 	handler->sys_off_cb = callback;  in register_sys_off_handler()
429 	handler->cb_data = cb_data;  in register_sys_off_handler()
430 	handler->mode = mode;  in register_sys_off_handler()
432 	if (handler->blocking) {  in register_sys_off_handler()
434 			err = blocking_notifier_chain_register(handler->list,  in register_sys_off_handler()
435 							       &handler->nb);  in register_sys_off_handler()
437 			err = blocking_notifier_chain_register_unique_prio(handler->list,  in register_sys_off_handler()
438 									   &handler->nb);  in register_sys_off_handler()
441 			err = atomic_notifier_chain_register(handler->list,  in register_sys_off_handler()
442 							     &handler->nb);  in register_sys_off_handler()
444 			err = atomic_notifier_chain_register_unique_prio(handler->list,  in register_sys_off_handler()
445 									 &handler->nb);  in register_sys_off_handler()
449 		free_sys_off_handler(handler);  in register_sys_off_handler()
453 	return handler;  in register_sys_off_handler()
458  *	unregister_sys_off_handler - Unregister sys-off handler
459  *	@handler: Sys-off handler
461  *	Unregisters given sys-off handler.
463 void unregister_sys_off_handler(struct sys_off_handler *handler)  in unregister_sys_off_handler()  argument
467 	if (IS_ERR_OR_NULL(handler))  in unregister_sys_off_handler()
470 	if (handler->blocking)  in unregister_sys_off_handler()
471 		err = blocking_notifier_chain_unregister(handler->list,  in unregister_sys_off_handler()
472 							 &handler->nb);  in unregister_sys_off_handler()
474 		err = atomic_notifier_chain_unregister(handler->list,  in unregister_sys_off_handler()
475 						       &handler->nb);  in unregister_sys_off_handler()
480 	free_sys_off_handler(handler);  in unregister_sys_off_handler()
486 	struct sys_off_handler *handler = data;  in devm_unregister_sys_off_handler()  local
488 	unregister_sys_off_handler(handler);  in devm_unregister_sys_off_handler()
492  *	devm_register_sys_off_handler - Register sys-off handler
493  *	@dev: Device that registers handler
495  *	@priority: Handler priority
499  *	Registers resource-managed sys-off handler.
509 	struct sys_off_handler *handler;  in devm_register_sys_off_handler()  local
511 	handler = register_sys_off_handler(mode, priority, callback, cb_data);  in devm_register_sys_off_handler()
512 	if (IS_ERR(handler))  in devm_register_sys_off_handler()
513 		return PTR_ERR(handler);  in devm_register_sys_off_handler()
516 					handler);  in devm_register_sys_off_handler()
521  *	devm_register_power_off_handler - Register power-off handler
526  *	Registers resource-managed sys-off handler with a default priority
543  *	devm_register_restart_handler - Register restart handler
548  *	Registers resource-managed sys-off handler with a default priority
588 	struct sys_off_handler *handler;  in register_platform_power_off()  local
590 	handler = register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,  in register_platform_power_off()
594 	if (IS_ERR(handler))  in register_platform_power_off()
595 		return PTR_ERR(handler);  in register_platform_power_off()
597 	platform_power_off_handler = handler;  in register_platform_power_off()
633  *	do_kernel_power_off - Execute kernel power-off handler call chain
637  *	Powers off the system immediately if a power-off handler function has
664  *	Returns true if power-off handler is registered and system can be