How to re-enable a USB port after disabling it in sysfs?

I have disabled a USB (2.0) port on a production Linux system with this command:

echo 1 > /sys/bus/usb/devices/usb2/2-1/2-1.8/port/disable

It successfully disabled the 8th USB port on hub #1. Devices plugged in this port are no longer enumerated. But now, I want to re-enable it (without resetting the controller or rebooting the system). I could not find the solution in documentation for the kernel. The folder 2-1.8 is gone, and also command echo "2-1.8" > /sys/bus/usb/devices/usb2/2-1/subsystem/drivers/usb/bind fails with No such device error.
How can I re-enable it?