[PATCH 4/4] usb: allow lpm (en/dis)able only if device is atleast in default state

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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@xxxxxx>
Tested-by: Aymen Bouattay <aymen.bouattay@xxxxxx>
---
 drivers/usb/core/hub.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 5edcfb2..8547b3a 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3743,7 +3743,8 @@ 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);
@@ -3799,7 +3800,8 @@ 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--;
-- 
1.8.3.1

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