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@@ -1039,6 +1039,39 @@ void usb_set_device_state(struct usb_device *udev,
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EXPORT_SYMBOL(usb_set_device_state);
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+#ifdef CONFIG_PM
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+
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+/**
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+ * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
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+ * @rhdev: struct usb_device for the root hub
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+ *
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+ * The USB host controller driver calls this function when its root hub
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+ * is resumed and Vbus power has been interrupted or the controller
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+ * has been reset. The routine marks all the children of the root hub
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+ * as NOTATTACHED and marks logical connect-change events on their ports.
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+ */
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+void usb_root_hub_lost_power(struct usb_device *rhdev)
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+{
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+ struct usb_hub *hub;
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+ int port1;
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+ unsigned long flags;
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+
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+ dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
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+ spin_lock_irqsave(&device_state_lock, flags);
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+ hub = hdev_to_hub(rhdev);
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+ for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
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+ if (rhdev->children[port1 - 1]) {
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+ recursively_mark_NOTATTACHED(
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+ rhdev->children[port1 - 1]);
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+ set_bit(port1, hub->change_bits);
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+ }
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+ }
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+ spin_unlock_irqrestore(&device_state_lock, flags);
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+}
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+EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
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+
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+#endif
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+
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static void choose_address(struct usb_device *udev)
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{
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int devnum;
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