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

[Ryan Zhou <ryanzhou54@gmail.com>]

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@gmail.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