Man page 9 : usb_reset_device

usb_reset_device - warn interface drivers and perform a USB port reset

int usb_reset_device(struct usb_device *  udev );

udev
    device to reset (not in SUSPENDED or NOTATTACHED state)

Warns all drivers bound to registered interfaces (using their pre_reset method), performs the port reset, and then lets the drivers know that the reset is over (using their post_reset method).

Return value is the same as for usb_reset_and_verify_device.

The caller must own the device lock. For example, itAqs safe to use this from a driver probe routine after downloading new firmware. For calls that might not occur during probe, drivers should lock the device using usb_lock_device_for_reset.

If an interface is currently being probed or disconnected, we assume its driver knows how to handle resets. For all other interfaces, if the driver doesnAqt have pre_reset and post_reset methods then we attempt to unbind it and rebind afterward.