USB: don't propagate FREEZE or PRETHAW suspends

This patch (as992) fixes a recently-added bug.  During a FREEZE or
PRETHAW suspend notification, non-root devices don't actually get
suspended.  So we shouldn't tell their parent hubs that they did.

(This code path used to be skipped over, until the FREEZE/PRETHAW test
got moved out of usb_suspend_both() into generic_suspend().)
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/driver.c

@@ -1112,7 +1112,12 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
 			usb_hcd_flush_endpoint(udev, udev->ep_out[i]);
 			usb_hcd_flush_endpoint(udev, udev->ep_in[i]);
 		}
-		if (parent)
+
+		/* If this is just a FREEZE or a PRETHAW, udev might
+		 * not really be suspended.  Only true suspends get
+		 * propagated up the device tree.
+		 */
+		if (parent && udev->state == USB_STATE_SUSPENDED)
 			usb_autosuspend_device(parent);
 	}