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LIBUSB_ERROR_INTERRUPTED can happen when (among other things) OpenOCD process receives a signal like SIGHUP or SIGINT during a call to libusb. Such situations are expected and should not be treated as an error - the affected request should just be restarted. Without this patch applied if a signal arrives during FTDI initialization procedure we can easily end up (if JTAG speed is low) in situations like https://review.openocd.org/c/openocd/+/4767. This happens because fpsse_flush fails due to LIBUSB_ERROR_INTERRUPTED . It should be noted that the current usage of mpsse_flush should be revised since it seems that we don't always process error codes returned by the function. Change-Id: Ifa063ce828068f8d0371e1c2a864bb6174649848 Signed-off-by: Parshintsev Anatoly <anatoly.parshintsev@syntacore.com> Reviewed-on: https://review.openocd.org/c/openocd/+/7769 Reviewed-by: Tim Newsome <tim@sifive.com> Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com> Tested-by: jenkins