linux-kernel - [PATCH v2] PM: sleep: wakeirq: fix wake irq warning in system suspend

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Message-ID: <20240301092657.15528-1-qingliang.li@mediatek.com>
Date: Fri, 1 Mar 2024 17:26:57 +0800
From: Qingliang Li <qingliang.li@...iatek.com>
To: "Rafael J . Wysocki" <rafael@...nel.org>, Pavel Machek <pavel@....cz>, Len
 Brown <len.brown@...el.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Matthias Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, Johan Hovold
	<johan+linaro@...nel.org>, Tony Lindgren <tony@...mide.com>
CC: <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>,
	Qingliang Li <qingliang.li@...iatek.com>, Dhruva Gole <d-gole@...com>
Subject: [PATCH v2] PM: sleep: wakeirq: fix wake irq warning in system suspend

When driver uses pm_runtime_force_suspend() as the system suspend callback
function and registers the wake irq with reverse enable ordering, the wake
irq will be re-enabled when entering system suspend, triggering an
'Unbalanced enable for IRQ xxx' warning. In this scenario, the call
sequence during system suspend is as follows:
  suspend_devices_and_enter()
    -> dpm_suspend_start()
      -> dpm_run_callback()
        -> pm_runtime_force_suspend()
          -> dev_pm_enable_wake_irq_check()
          -> dev_pm_enable_wake_irq_complete()

    -> suspend_enter()
      -> dpm_suspend_noirq()
        -> device_wakeup_arm_wake_irqs()
          -> dev_pm_arm_wake_irq()

To fix this issue, complete the setting of WAKE_IRQ_DEDICATED_ENABLED flag
in dev_pm_enable_wake_irq_complete() to avoid redundant irq enablement.

Reviewed-by: Dhruva Gole <d-gole@...com>
Signed-off-by: Qingliang Li <qingliang.li@...iatek.com>
---
 drivers/base/power/wakeirq.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/base/power/wakeirq.c b/drivers/base/power/wakeirq.c
index 42171f766dcb..5a5a9e978e85 100644
--- a/drivers/base/power/wakeirq.c
+++ b/drivers/base/power/wakeirq.c
@@ -313,8 +313,10 @@ void dev_pm_enable_wake_irq_complete(struct device *dev)
 		return;
 
 	if (wirq->status & WAKE_IRQ_DEDICATED_MANAGED &&
-	    wirq->status & WAKE_IRQ_DEDICATED_REVERSE)
+	    wirq->status & WAKE_IRQ_DEDICATED_REVERSE) {
 		enable_irq(wirq->irq);
+		wirq->status |= WAKE_IRQ_DEDICATED_ENABLED;
+	}
 }
 
 /**
-- 
2.25.1