Re: [RFC PATCH] usb: core: defer leaf-device resume off the S3 critical path

Hello,

On Wed, Aug 5, 2026 at 11:37 AM Hongyu Xie <[email protected]> wrote:
> [...]
> @@ -1643,11 +1754,22 @@ int usb_resume_complete(struct device *dev)
>  {
>         struct usb_device *udev = to_usb_device(dev);
>
> +       if (udev->state == USB_STATE_NOTATTACHED)
> +               return 0;
> +
> +       /* Queue the real port reset after dpm_complete, once every hub in
> +        * the tree has finished resume and downstream ports are settled.
> +        */
> +       if (udev->defer_resume_pending) {
> +               udev->defer_resume_pending = 0;
> +               queue_work(system_unbound_wq, &udev->defer_resume_work);
> +               return 0;
> +       }
> +

Please note that `system_unbound_wq` is the old unbound Workqueue. You
should use the newer, `system_dfl_wq`.

Thanks!

-- 

Marco Crivellari

SUSE Labs