linux-kernel - [PATCH 2/4] PM / wakeup: Make events_lock a RAW

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Date:   Fri, 25 May 2018 11:46:46 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-pm@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Thomas Gleixner <tglx@...utronix.de>, bigeasy@...utronix.de,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] PM / wakeup: Make events_lock a RAW_SPINLOCK

The `events_lock' is acquired during suspend while interrupts are
disabled even on RT. The lock is taken only for a very brief moment.
Make it a RAW lock which avoids "sleeping while atomic" warnings on RT.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 drivers/base/power/wakeup.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index ea01621ed769..2e76fbcba76e 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -57,7 +57,7 @@ static void split_counters(unsigned int *cnt, unsigned int *inpr)
 /* A preserved old value of the events counter. */
 static unsigned int saved_count;
 
-static DEFINE_SPINLOCK(events_lock);
+static DEFINE_RAW_SPINLOCK(events_lock);
 
 static void pm_wakeup_timer_fn(struct timer_list *t);
 
@@ -185,9 +185,9 @@ void wakeup_source_add(struct wakeup_source *ws)
 	ws->active = false;
 	ws->last_time = ktime_get();
 
-	spin_lock_irqsave(&events_lock, flags);
+	raw_spin_lock_irqsave(&events_lock, flags);
 	list_add_rcu(&ws->entry, &wakeup_sources);
-	spin_unlock_irqrestore(&events_lock, flags);
+	raw_spin_unlock_irqrestore(&events_lock, flags);
 }
 EXPORT_SYMBOL_GPL(wakeup_source_add);
 
@@ -202,9 +202,9 @@ void wakeup_source_remove(struct wakeup_source *ws)
 	if (WARN_ON(!ws))
 		return;
 
-	spin_lock_irqsave(&events_lock, flags);
+	raw_spin_lock_irqsave(&events_lock, flags);
 	list_del_rcu(&ws->entry);
-	spin_unlock_irqrestore(&events_lock, flags);
+	raw_spin_unlock_irqrestore(&events_lock, flags);
 	synchronize_srcu(&wakeup_srcu);
 }
 EXPORT_SYMBOL_GPL(wakeup_source_remove);
@@ -843,7 +843,7 @@ bool pm_wakeup_pending(void)
 	unsigned long flags;
 	bool ret = false;
 
-	spin_lock_irqsave(&events_lock, flags);
+	raw_spin_lock_irqsave(&events_lock, flags);
 	if (events_check_enabled) {
 		unsigned int cnt, inpr;
 
@@ -851,7 +851,7 @@ bool pm_wakeup_pending(void)
 		ret = (cnt != saved_count || inpr > 0);
 		events_check_enabled = !ret;
 	}
-	spin_unlock_irqrestore(&events_lock, flags);
+	raw_spin_unlock_irqrestore(&events_lock, flags);
 
 	if (ret) {
 		pr_info("PM: Wakeup pending, aborting suspend\n");
@@ -940,13 +940,13 @@ bool pm_save_wakeup_count(unsigned int count)
 	unsigned long flags;
 
 	events_check_enabled = false;
-	spin_lock_irqsave(&events_lock, flags);
+	raw_spin_lock_irqsave(&events_lock, flags);
 	split_counters(&cnt, &inpr);
 	if (cnt == count && inpr == 0) {
 		saved_count = count;
 		events_check_enabled = true;
 	}
-	spin_unlock_irqrestore(&events_lock, flags);
+	raw_spin_unlock_irqrestore(&events_lock, flags);
 	return events_check_enabled;
 }
 
-- 
2.17.0