Commit 0e2110d2 authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Rafael J. Wysocki
Browse files

kernel/reboot: Add kernel_can_power_off() 



Add kernel_can_power_off() helper that replaces open-coded checks of
the global pm_power_off variable. This is a necessary step towards
supporting chained power-off handlers.

Signed-off-by: default avatarDmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 5d34b41a

include/linux/reboot.h

+1 −0
Original line number Diff line number Diff line
@@ -149,6 +149,7 @@ extern void kernel_restart_prepare(char *cmd); 
extern void kernel_restart(char *cmd);

extern void kernel_halt(void);

extern void kernel_power_off(void);

extern bool kernel_can_power_off(void);



extern int C_A_D; /* for sysctl */

void ctrl_alt_del(void);

kernel/reboot.c

+13 −1
Original line number Diff line number Diff line
@@ -523,6 +523,18 @@ void do_kernel_power_off(void) 
	atomic_notifier_call_chain(&power_off_handler_list, 0, NULL);

}



/**

 *	kernel_can_power_off - check whether system can be powered off

 *

 *	Returns true if power-off handler is registered and system can be

 *	powered off, false otherwise.

 */

bool kernel_can_power_off(void)

{

	return !atomic_notifier_call_chain_is_empty(&power_off_handler_list);

}

EXPORT_SYMBOL_GPL(kernel_can_power_off);



/**

 *	kernel_power_off - power_off the system

 *
@@ -581,7 +593,7 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, 
	/* Instead of trying to make the power_off code look like

	 * halt when pm_power_off is not set do it the easy way.

	 */

	if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)

	if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !kernel_can_power_off())

		cmd = LINUX_REBOOT_CMD_HALT;



	mutex_lock(&system_transition_mutex);