linux-kernel - [PATCH review for 4.4 01/24] PM / wakeirq: report a wakeup

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Date:   Sat, 7 Oct 2017 22:37:43 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Grygorii Strashko <grygorii.strashko@...com>,
        Tony Lindgren <tony@...mide.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
Subject: [PATCH review for 4.4 01/24] PM / wakeirq: report a wakeup_event on
 dedicated wekup irq

From: Grygorii Strashko <grygorii.strashko@...com>

[ Upstream commit 09bb6e93956ae5175b96905b723ec879c3ca0765 ]

There are two reasons for reporting wakeup event when dedicated wakeup
IRQ is triggered:

- wakeup events accounting, so proper statistical data will be
  displayed in sysfs and debugfs;

- there are small window when System is entering suspend during which
  dedicated wakeup IRQ can be lost:

dpm_suspend_noirq()
  |- device_wakeup_arm_wake_irqs()
      |- dev_pm_arm_wake_irq(X)
         |- IRQ is enabled and marked as wakeup source
[1]...
  |- suspend_device_irqs()
     |- suspend_device_irq(X)
	|- irqd_set(X, IRQD_WAKEUP_ARMED);
	   |- wakup IRQ armed

The wakeup IRQ can be lost if it's triggered at point [1]
and not armed yet.

Hence, fix above cases by adding simple pm_wakeup_event() call in
handle_threaded_wake_irq().

Fixes: 4990d4fe327b (PM / Wakeirq: Add automated device wake IRQ handling)
Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
Tested-by: Keerthy <j-keerthy@...com>
[ tony@...mide.com: added missing return to avoid warnings ]
Tested-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/base/power/wakeirq.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/base/power/wakeirq.c b/drivers/base/power/wakeirq.c
index 404d94c6c8bc..feba1b211898 100644
--- a/drivers/base/power/wakeirq.c
+++ b/drivers/base/power/wakeirq.c
@@ -141,6 +141,13 @@ static irqreturn_t handle_threaded_wake_irq(int irq, void *_wirq)
 	struct wake_irq *wirq = _wirq;
 	int res;
 
+	/* Maybe abort suspend? */
+	if (irqd_is_wakeup_set(irq_get_irq_data(irq))) {
+		pm_wakeup_event(wirq->dev, 0);
+
+		return IRQ_HANDLED;
+	}
+
 	/* We don't want RPM_ASYNC or RPM_NOWAIT here */
 	res = pm_runtime_resume(wirq->dev);
 	if (res < 0)
-- 
2.11.0