Re: [PATCH v2] drvier: usb: dwc3: Fix runtime PM trying to activate child device xxx.dwc3 but parent is not active

Greg KH
2025-09-09T16:25:12Z

On Wed, Sep 10, 2025 at 12:19:01AM +0800, Ryan Zhou wrote:
> 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
>
>

What commit id does this fi?

thanks,

greg k-h