diff options
| -rw-r--r-- | include/linux/reboot.h | 1 | ||||
| -rw-r--r-- | kernel/reboot.c | 14 |
2 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/reboot.h b/include/linux/reboot.h index 99a9753e77bc..5837c6c2fb40 100644 --- a/include/linux/reboot.h +++ b/include/linux/reboot.h @@ -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); diff --git a/kernel/reboot.c b/kernel/reboot.c index 7723aff4d09b..fb3f49350927 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -524,6 +524,18 @@ void do_kernel_power_off(void) } /** + * 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 * * Shutdown everything and perform a clean system power_off. @@ -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); |