usb: allow lpm (en/dis)able only if device is atleast in default state

When a USB device is disconnected, usb_unbind_interface is called, which
tries to enable and disable LPM. usb_enable_lpm also try to send a
control command SET SEL to the device.
Since device is already disconnected, therefore it does not make sense
to execute usb_(en/dis)able_lpm.
This patch returns from usb_(en/dis)able_lpm, if device was not in
default state atleast.

Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Tested-by: Aymen Bouattay <aymen.bouattay@st.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/hub.c

@@ -3860,7 +3860,8 @@ int usb_disable_lpm(struct usb_device *udev)
 
 	if (!udev || !udev->parent ||
 			udev->speed != USB_SPEED_SUPER ||
-			!udev->lpm_capable)
+			!udev->lpm_capable ||
+			udev->state < USB_STATE_DEFAULT)
 		return 0;
 
 	hcd = bus_to_hcd(udev->bus);
@@ -3916,7 +3917,8 @@ void usb_enable_lpm(struct usb_device *udev)
 
 	if (!udev || !udev->parent ||
 			udev->speed != USB_SPEED_SUPER ||
-			!udev->lpm_capable)
+			!udev->lpm_capable ||
+			udev->state < USB_STATE_DEFAULT)
 		return;
 
 	udev->lpm_disable_count--;