linux-kernel - [PATCH v3] drvier: usb: dwc3: Fix runtime PM trying to activate child device xxx.dwc3 but parent is not active

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Message-Id: <20250910122630.8435-1-ryanzhou54@gmail.com>
Date: Wed, 10 Sep 2025 20:26:30 +0800
From: Ryan Zhou <ryanzhou54@...il.com>
To: gregkh@...uxfoundation.org
Cc: Thinh.Nguyen@...opsys.com,
	linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org,
	linux-usb@...r.kernel.org,
	rafael@...nel.org,
	royluo@...gle.com,
	ryanzhou54@...il.com,
	stern@...land.harvard.edu
Subject: [PATCH v3] drvier: usb: dwc3: Fix runtime PM trying to activate child device xxx.dwc3 but parent is not active

Issue description:During the wake-up sequence, if the system invokes
 dwc3->resume and detects that the parent device of dwc3 is in a
runtime suspend state, the system will generate an error: runtime PM
trying to activate child device xxx.dwc3 but parent is not active.

Solution:At the dwc3->resume entry point, if the dwc3 controller
is detected in a suspended state, the function shall return
immediately without executing any further operations.

Signed-off-by: Ryan Zhou <ryanzhou54@...il.com>
---
 drivers/usb/dwc3/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 370fc524a468..06a6f8a67129 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -2687,6 +2687,9 @@ int dwc3_pm_resume(struct dwc3 *dwc)
 	struct device *dev = dwc->dev;
 	int		ret = 0;

+	if (pm_runtime_suspended(dev))
+		return ret;
+
 	pinctrl_pm_select_default_state(dev);

 	pm_runtime_disable(dev);
-- 
2.25.1