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PM: sleep: Do not assume that "mem" is always present

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An implementation of suspend_ops is allowed to reject the PM_SUSPEND_MEM
suspend type from its ->valid() callback, we should not assume that it
is always present as this is not a correct reflection of what a firmware
interface may support.

Fixes: 406e79385f ("PM / sleep: System sleep state selection interface rework")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Florian Fainelli 2021-09-14 19:23:28 -07:00 committed by Rafael J. Wysocki
parent 6880fa6c56
commit bfcc1e67ff
1 changed files with 2 additions and 2 deletions
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4
kernel/power/suspend.c
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@ -171,8 +171,7 @@ static bool valid_state(suspend_state_t state)
void __init pm_states_init(void)
{
/* "mem" and "freeze" are always present in /sys/power/state. */
pm_states[PM_SUSPEND_MEM] = pm_labels[PM_SUSPEND_MEM];
/* "freeze" is always present in /sys/power/state. */
pm_states[PM_SUSPEND_TO_IDLE] = pm_labels[PM_SUSPEND_TO_IDLE];
/*
* Suspend-to-idle should be supported even without any suspend_ops,
@ -214,6 +213,7 @@ void suspend_set_ops(const struct platform_suspend_ops *ops)
}
if (valid_state(PM_SUSPEND_MEM)) {
mem_sleep_states[PM_SUSPEND_MEM] = mem_sleep_labels[PM_SUSPEND_MEM];
pm_states[PM_SUSPEND_MEM] = pm_labels[PM_SUSPEND_MEM];
if (mem_sleep_default >= PM_SUSPEND_MEM)
mem_sleep_current = PM_SUSPEND_MEM;
}