+/* Report wakeup requests from the ports of a resuming root hub */
+static void report_wakeup_requests(struct usb_hub *hub)
+{
+ struct usb_device *hdev = hub->hdev;
+ struct usb_device *udev;
+ struct usb_hcd *hcd;
+ unsigned long resuming_ports;
+ int i;
+
+ if (hdev->parent)
+ return; /* Not a root hub */
+
+ hcd = bus_to_hcd(hdev->bus);
+ if (hcd->driver->get_resuming_ports) {
+
+ /*
+ * The get_resuming_ports() method returns a bitmap (origin 0)
+ * of ports which have started wakeup signaling but have not
+ * yet finished resuming. During system resume we will
+ * resume all the enabled ports, regardless of any wakeup
+ * signals, which means the wakeup requests would be lost.
+ * To prevent this, report them to the PM core here.
+ */
+ resuming_ports = hcd->driver->get_resuming_ports(hcd);
+ for (i = 0; i < hdev->maxchild; ++i) {
+ if (test_bit(i, &resuming_ports)) {
+ udev = hub->ports[i]->child;
+ if (udev)
+ pm_wakeup_event(&udev->dev, 0);
+ }
+ }
+ }
+}
+