When the exported device was replaced underneath usbip-host (devnum
changed after a flap) or the recorded original driver was empty,
releaseExport skipped the re-bind and left the device driverless — and
the USB core never re-probes such devices, so it stayed dead until a
physical replug. Worse, the next Reconcile recorded originalDriver=""
for it, making every later release repeat the damage. Release now falls
back to usbip-host's rebind attribute (device_attach, the official
usbip unbind path) with drivers_probe as a second fallback.
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