Commit e7fd8b68 authored by Kai-Heng Feng's avatar Kai-Heng Feng Committed by Rafael J. Wysocki
Browse files

kernel/reboot: Add SYS_OFF_MODE_RESTART_PREPARE mode 



Add SYS_OFF_MODE_RESTART_PREPARE callbacks to be invoked before
a system restart.

Suggested-by: default avatarDmitry Osipenko <dmitry.osipenko@collabora.com>
Reviewed-by: default avatarDmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: default avatarKai-Heng Feng <kai.heng.feng@canonical.com>
[ rjw: Changelog edits ]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent f76349cf

include/linux/reboot.h

+8 −0
Original line number Diff line number Diff line
@@ -105,6 +105,14 @@ enum sys_off_mode { 
	 */

	SYS_OFF_MODE_POWER_OFF,



	/**

	 * @SYS_OFF_MODE_RESTART_PREPARE:

	 *

	 * Handlers prepare system to be restarted. Handlers are

	 * allowed to sleep.

	 */

	SYS_OFF_MODE_RESTART_PREPARE,



	/**

	 * @SYS_OFF_MODE_RESTART:

	 *

kernel/reboot.c

+17 −0
Original line number Diff line number Diff line
@@ -243,6 +243,17 @@ void migrate_to_reboot_cpu(void) 
	set_cpus_allowed_ptr(current, cpumask_of(cpu));

}



/*

 *	Notifier list for kernel code which wants to be called

 *	to prepare system for restart.

 */

static BLOCKING_NOTIFIER_HEAD(restart_prep_handler_list);



static void do_kernel_restart_prepare(void)

{

	blocking_notifier_call_chain(&restart_prep_handler_list, 0, NULL);

}



/**

 *	kernel_restart - reboot the system

 *	@cmd: pointer to buffer containing command to execute for restart
@@ -254,6 +265,7 @@ void migrate_to_reboot_cpu(void) 
void kernel_restart(char *cmd)

{

	kernel_restart_prepare(cmd);

	do_kernel_restart_prepare();

	migrate_to_reboot_cpu();

	syscore_shutdown();

	if (!cmd)
@@ -396,6 +408,11 @@ register_sys_off_handler(enum sys_off_mode mode, 
		handler->list = &power_off_handler_list;

		break;



	case SYS_OFF_MODE_RESTART_PREPARE:

		handler->list = &restart_prep_handler_list;

		handler->blocking = true;

		break;



	case SYS_OFF_MODE_RESTART:

		handler->list = &restart_handler_list;

		break;