Some drivers have different flows for hibernation and suspend. If the driver opportunistically will skip thaw() then it needs a hint to know what is happening after the hibernate.
Introduce a new symbol pm_hibernation_mode_is_suspend() that drivers can call to determine if suspending the system for this purpose. Tested-by: Ionut Nechita <[email protected]> Signed-off-by: Mario Limonciello (AMD) <[email protected]> --- include/linux/suspend.h | 2 ++ kernel/power/hibernate.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 317ae31e89b3..4b11efd68729 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -479,6 +479,7 @@ extern void unlock_system_sleep(unsigned int); extern bool pm_sleep_transition_in_progress(void); bool pm_hibernate_is_recovering(void); +bool pm_hibernation_mode_is_suspend(void); #else /* !CONFIG_PM_SLEEP */ @@ -513,6 +514,7 @@ static inline void unlock_system_sleep(unsigned int flags) {} static inline bool pm_sleep_transition_in_progress(void) { return false; } static inline bool pm_hibernate_is_recovering(void) { return false; } +static inline bool pm_hibernation_mode_is_suspend(void) { return false; } #endif /* !CONFIG_PM_SLEEP */ diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index 1defe8081e64..a991a1362d77 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -80,6 +80,15 @@ static const struct platform_hibernation_ops *hibernation_ops; static atomic_t hibernate_atomic = ATOMIC_INIT(1); +/** + * pm_hibernation_mode_is_suspend - Check if hibernation has been set to suspend + */ +bool pm_hibernation_mode_is_suspend(void) +{ + return hibernation_mode == HIBERNATION_SUSPEND; +} +EXPORT_SYMBOL_GPL(pm_hibernation_mode_is_suspend); + bool hibernate_acquire(void) { return atomic_add_unless(&hibernate_atomic, -1, 0); -- 2.51.0
