kernel/reboot: Add devm_register_restart_handler()

Add devm_register_restart_handler() helper that registers sys-off handler using restart mode and with a default priority. Most drivers will want to register restart handler with a default priority, so this helper will reduce the boilerplate code and make code easier to read and follow.

Dmitry Osipenko committed 4 years ago

Commit 6779db91 parent d2c54152 files · +26 −0Browse files

Unified · Split

2 files

include/linux/reboot.h +4 −0
kernel/reboot.c +22 −0

include/linux/reboot.h+4−0

@@ -145,6 +145,10 @@ int devm_register_power_off_handler(struct device *dev, · 144 unmodified lines
145	int (callback)(struct sys_off_data data),	145	int (callback)(struct sys_off_data data),
146	void *cb_data);	146	void *cb_data);
147		147
		148	int devm_register_restart_handler(struct device *dev,
		149	int (callback)(struct sys_off_data data),
		150	void *cb_data);
		151
148	int register_platform_power_off(void (*power_off)(void));	152	int register_platform_power_off(void (*power_off)(void));
149	void unregister_platform_power_off(void (*power_off)(void));	153	void unregister_platform_power_off(void (*power_off)(void));
150		154

kernel/reboot.c+22−0

@@ -484,6 +484,28 @@ int devm_register_power_off_handler(struct device *dev, · 483 unmodified lines
484	}	484	}
485	EXPORT_SYMBOL_GPL(devm_register_power_off_handler);	485	EXPORT_SYMBOL_GPL(devm_register_power_off_handler);
486		486
		487	/**
		488	* devm_register_restart_handler - Register restart handler
		489	* @dev: Device that registers callback
		490	* @callback: Callback function
		491	* @cb_data: Callback's argument
		492	*
		493	* Registers resource-managed sys-off handler with a default priority
		494	* and using restart mode.
		495	*
		496	* Returns zero on success, or error code on failure.
		497	*/
		498	int devm_register_restart_handler(struct device *dev,
		499	int (callback)(struct sys_off_data data),
		500	void *cb_data)
		501	{
		502	return devm_register_sys_off_handler(dev,
		503	SYS_OFF_MODE_RESTART,
		504	SYS_OFF_PRIO_DEFAULT,
		505	callback, cb_data);
		506	}
		507	EXPORT_SYMBOL_GPL(devm_register_restart_handler);
		508
487	static struct sys_off_handler *platform_power_off_handler;	509	static struct sys_off_handler *platform_power_off_handler;
488		510
489	static int platform_power_off_notify(struct sys_off_data *data)	511	static int platform_power_off_notify(struct sys_off_data *data)