diff options
| author | Dmitry Osipenko <dmitry.osipenko@collabora.com> | 2022-05-10 02:32:15 +0300 |
|---|---|---|
| committer | Stefan Eichenberger <eichest@gmail.com> | 2023-10-13 14:49:15 +0200 |
| commit | 381b9a34fdc5012836a9acb920928ac5588036d7 (patch) | |
| tree | eeb1db298831e90fa9ae36c2a5c2c24ff9c0b72e /kernel/reboot.c | |
| parent | 36f6c2f31f3bead10ff1aa1217acbcb347ada0ef (diff) | |
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.
Upstream-Status: Backport [0e2110d2e910e44cc7cf23fce14613e232602602]
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/reboot.c')
| -rw-r--r-- | kernel/reboot.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/kernel/reboot.c b/kernel/reboot.c index 71c486959793..bb131fb3fd01 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -482,6 +482,18 @@ 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. @@ -540,7 +552,7 @@ 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); |