usb_get_dev — increments the reference count of the usb device structure
struct usb_device * usb_get_dev (struct usb_device * dev);
Each live reference to a device should be refcounted.
Drivers for USB interfaces should normally record such references in
their probe methods, when they bind to an interface, and release
them by calling usb_put_dev, in their disconnect methods.
A pointer to the device with the incremented reference counter is returned.