[PATCH 6.6 080/396] PM: sleep: wakeirq: fix wake irq warning in system suspend

Greg Kroah-Hartman
2024-04-01T16:39:04Z

From: Qingliang Li <qingliang.li@mediatek.com>

[ Upstream commit e7a7681c859643f3f2476b2a28a494877fd89442 ]

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.

Fixes: 8527beb12087 ("PM: sleep: wakeirq: fix wake irq arming")
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Qingliang Li <qingliang.li@mediatek.com>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Cc: 5.16+ <stable@vger.kernel.org> # 5.16+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 42171f766dcba..5a5a9e978e85f 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;
+ }
}

/**
--
2.43.0