[PATCH 4/4] PM / wakeup: Make s2idle_lock a RAW_SPINLOCK

From: Sebastian Andrzej Siewior
Date: Fri May 25 2018 - 08:00:08 EST


The `s2idle_lock' is acquired during suspend while interrupts are
disabled even on RT. The lock is acquired for short sections only.
Make it a RAW lock which avoids "sleeping while atomic" warnings on RT.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
kernel/power/suspend.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index f865aa934835..ca2abb5e5109 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -61,7 +61,7 @@ static const struct platform_s2idle_ops *s2idle_ops;
static DECLARE_SWAIT_QUEUE_HEAD(s2idle_wait_head);

enum s2idle_states __read_mostly s2idle_state;
-static DEFINE_SPINLOCK(s2idle_lock);
+static DEFINE_RAW_SPINLOCK(s2idle_lock);

void s2idle_set_ops(const struct platform_s2idle_ops *ops)
{
@@ -79,12 +79,12 @@ static void s2idle_enter(void)
{
trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_TO_IDLE, true);

- spin_lock_irq(&s2idle_lock);
+ raw_spin_lock_irq(&s2idle_lock);
if (pm_wakeup_pending())
goto out;

s2idle_state = S2IDLE_STATE_ENTER;
- spin_unlock_irq(&s2idle_lock);
+ raw_spin_unlock_irq(&s2idle_lock);

get_online_cpus();
cpuidle_resume();
@@ -98,11 +98,11 @@ static void s2idle_enter(void)
cpuidle_pause();
put_online_cpus();

- spin_lock_irq(&s2idle_lock);
+ raw_spin_lock_irq(&s2idle_lock);

out:
s2idle_state = S2IDLE_STATE_NONE;
- spin_unlock_irq(&s2idle_lock);
+ raw_spin_unlock_irq(&s2idle_lock);

trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_TO_IDLE, false);
}
@@ -159,12 +159,12 @@ void s2idle_wake(void)
{
unsigned long flags;

- spin_lock_irqsave(&s2idle_lock, flags);
+ raw_spin_lock_irqsave(&s2idle_lock, flags);
if (s2idle_state > S2IDLE_STATE_NONE) {
s2idle_state = S2IDLE_STATE_WAKE;
swake_up(&s2idle_wait_head);
}
- spin_unlock_irqrestore(&s2idle_lock, flags);
+ raw_spin_unlock_irqrestore(&s2idle_lock, flags);
}
EXPORT_SYMBOL_GPL(s2idle_wake);

--
2.17.0