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been detached. When a USB device has been detached the kernel file handle stops responding to commands. USB applications which continue to run after the USB device has been detached, depend on LibUSB generated events to tear down its pending USB transfers. Add code to handle the needed cleanup when processing the USB transfer(s) fails and prevent new USB transfer(s) from being submitted. Found by: Ludovic Rousseau <ludovic.rousseau+freebsd@gmail.com> PR: 231076 MFC after: 1 week Approved by: re (gjb) Sponsored by: Mellanox Technologies