Use device life-cycle managed register function to simplify probe and
exit paths.

Signed-off-by: Andrew Davis <afd@ti.com>
---
 drivers/power/reset/restart-poweroff.c | 25 ++++++++-----------------
 1 file changed, 8 insertions(+), 17 deletions(-)

diff --git a/drivers/power/reset/restart-poweroff.c b/drivers/power/reset/restart-poweroff.c
index f4d6004793d3a..fcd588f9ae9d3 100644
--- a/drivers/power/reset/restart-poweroff.c
+++ b/drivers/power/reset/restart-poweroff.c
@@ -14,29 +14,21 @@
 #include <linux/module.h>
 #include <linux/reboot.h>
 
-static void restart_poweroff_do_poweroff(void)
+static int restart_poweroff_do_poweroff(struct sys_off_data *data)
 {
 	reboot_mode = REBOOT_HARD;
 	machine_restart(NULL);
+	return NOTIFY_DONE;
 }
 
 static int restart_poweroff_probe(struct platform_device *pdev)
 {
-	/* If a pm_power_off function has already been added, leave it alone */
-	if (pm_power_off != NULL) {
-		dev_err(&pdev->dev,
-			"pm_power_off function already registered");
-		return -EBUSY;
-	}
-
-	pm_power_off = &restart_poweroff_do_poweroff;
-	return 0;
-}
-
-static void restart_poweroff_remove(struct platform_device *pdev)
-{
-	if (pm_power_off == &restart_poweroff_do_poweroff)
-		pm_power_off = NULL;
+	/* Set this handler to low priority to not override an existing handler */
+	return devm_register_sys_off_handler(&pdev->dev,
+					     SYS_OFF_MODE_POWER_OFF,
+					     SYS_OFF_PRIO_LOW,
+					     restart_poweroff_do_poweroff,
+					     NULL);
 }
 
 static const struct of_device_id of_restart_poweroff_match[] = {
@@ -47,7 +39,6 @@ MODULE_DEVICE_TABLE(of, of_restart_poweroff_match);
 
 static struct platform_driver restart_poweroff_driver = {
 	.probe = restart_poweroff_probe,
-	.remove_new = restart_poweroff_remove,
 	.driver = {
 		.name = "poweroff-restart",
 		.of_match_table = of_restart_poweroff_match,
-- 
2.39.2