linux-kernel - [PATCH 1/3] PM / wakeirq: fix wake irq arming

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Date:   Thu, 13 Jul 2023 16:57:39 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Tony Lindgren <tony@...mide.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-serial@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>, stable@...r.kernel.org
Subject: [PATCH 1/3] PM / wakeirq: fix wake irq arming

The decision whether to enable a wake irq during suspend can not be done
based on the runtime PM state directly as a driver may use wake irqs
without implementing runtime PM. Such drivers specifically leave the
state set to the default 'suspended' and the wake irq is thus never
enabled at suspend.

Add a new wake irq flag to track whether a dedicated wake irq has been
enabled at runtime suspend and therefore must not be enabled at system
suspend.

Note that pm_runtime_enabled() can not be used as runtime PM is always
disabled during late suspend.

Fixes: 69728051f5bf ("PM / wakeirq: Fix unbalanced IRQ enable for wakeirq")
Cc: stable@...r.kernel.org      # 4.16
Cc: Tony Lindgren <tony@...mide.com>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/base/power/power.h   |  1 +
 drivers/base/power/wakeirq.c | 12 ++++++++----
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index 0eb7f02b3ad5..922ed457db19 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -29,6 +29,7 @@ extern u64 pm_runtime_active_time(struct device *dev);
 #define WAKE_IRQ_DEDICATED_MASK		(WAKE_IRQ_DEDICATED_ALLOCATED | \
 					 WAKE_IRQ_DEDICATED_MANAGED | \
 					 WAKE_IRQ_DEDICATED_REVERSE)
+#define WAKE_IRQ_DEDICATED_ENABLED	BIT(3)
 
 struct wake_irq {
 	struct device *dev;
diff --git a/drivers/base/power/wakeirq.c b/drivers/base/power/wakeirq.c
index d487a6bac630..afd094dec5ca 100644
--- a/drivers/base/power/wakeirq.c
+++ b/drivers/base/power/wakeirq.c
@@ -314,8 +314,10 @@ void dev_pm_enable_wake_irq_check(struct device *dev,
 	return;
 
 enable:
-	if (!can_change_status || !(wirq->status & WAKE_IRQ_DEDICATED_REVERSE))
+	if (!can_change_status || !(wirq->status & WAKE_IRQ_DEDICATED_REVERSE)) {
 		enable_irq(wirq->irq);
+		wirq->status |= WAKE_IRQ_DEDICATED_ENABLED;
+	}
 }
 
 /**
@@ -336,8 +338,10 @@ void dev_pm_disable_wake_irq_check(struct device *dev, bool cond_disable)
 	if (cond_disable && (wirq->status & WAKE_IRQ_DEDICATED_REVERSE))
 		return;
 
-	if (wirq->status & WAKE_IRQ_DEDICATED_MANAGED)
+	if (wirq->status & WAKE_IRQ_DEDICATED_MANAGED) {
+		wirq->status &= ~WAKE_IRQ_DEDICATED_ENABLED;
 		disable_irq_nosync(wirq->irq);
+	}
 }
 
 /**
@@ -376,7 +380,7 @@ void dev_pm_arm_wake_irq(struct wake_irq *wirq)
 
 	if (device_may_wakeup(wirq->dev)) {
 		if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED &&
-		    !pm_runtime_status_suspended(wirq->dev))
+		    !(wirq->status & WAKE_IRQ_DEDICATED_ENABLED))
 			enable_irq(wirq->irq);
 
 		enable_irq_wake(wirq->irq);
@@ -399,7 +403,7 @@ void dev_pm_disarm_wake_irq(struct wake_irq *wirq)
 		disable_irq_wake(wirq->irq);
 
 		if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED &&
-		    !pm_runtime_status_suspended(wirq->dev))
+		    !(wirq->status & WAKE_IRQ_DEDICATED_ENABLED))
 			disable_irq_nosync(wirq->irq);
 	}
 }
-- 
2.41.0