usb_autopm_put_interface()

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Hi,

this made me wonder:

void usb_autopm_put_interface(struct usb_interface *intf)
{
	struct usb_device	*udev = interface_to_usbdev(intf);
	int			status;

	udev->last_busy = jiffies;

Why do we set last_busy here?

	Regards
		Oliver
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