From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: linux-pm@vger.kernel.org
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
Thomas Gleixner <tglx@linutronix.de>,
bigeasy@linutronix.de, linux-kernel@vger.kernel.org
Subject: [PATCH 2/4] PM / wakeup: Make events_lock a RAW_SPINLOCK
Date: Fri, 25 May 2018 11:46:46 +0200 [thread overview]
Message-ID: <20180525094648.15464-3-bigeasy@linutronix.de> (raw)
In-Reply-To: <20180525094648.15464-1-bigeasy@linutronix.de>
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@linutronix.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
next prev parent reply other threads:[~2018-05-25 9:47 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-25 9:46 PM / suspend / s2idle: avoiding splats on RT Sebastian Andrzej Siewior
2018-05-25 9:46 ` [PATCH 1/4] PM / suspend: Prevent might sleep splats Sebastian Andrzej Siewior
2018-05-25 10:03 ` Rafael J. Wysocki
2018-05-25 15:54 ` [PATCH 1/4 v2] " Sebastian Andrzej Siewior
2018-05-29 8:49 ` Rafael J. Wysocki
2018-05-25 9:46 ` Sebastian Andrzej Siewior [this message]
2018-05-25 9:46 ` [PATCH 3/4] PM / s2idle: Make s2idle_wait_head swait based Sebastian Andrzej Siewior
2018-05-25 9:46 ` [PATCH 4/4] PM / wakeup: Make s2idle_lock a RAW_SPINLOCK Sebastian Andrzej Siewior
2018-05-25 10:05 ` PM / suspend / s2idle: avoiding splats on RT Rafael J. Wysocki
2018-05-25 10:12 ` Sebastian Andrzej Siewior
2018-05-25 10:20 ` Rafael J. Wysocki
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