AI Scrutiny Accelerates Removal of 27-Year-Old Linux Driver

Greg Kroah-Hartman, the Linux kernel's chief maintainer, deleted a driver in early August that had been sitting in the codebase untouched for nearly three decades. The Moxa Intellio serial driver—2,137 lines of code that handled multiport serial connections for industrial hardware—was removed not because anyone was using it, but because AI agents had started scanning the kernel and flagging potential problems in dead code that nobody could actually test or fix.

The driver itself was never the problem. Moxa, a Taiwanese company that manufactures industrial networking equipment for factories and railway systems, had discontinued the Intellio hardware back in 2017. By 2021, the company had formally told kernel maintainers they no longer needed software support for the line. For five years after that, the code just sat there, inert, part of the kernel's accumulated technical debt.

What changed wasn't the code. It was the noise. As AI systems began scanning the kernel codebase more aggressively, they started finding "interesting" things in the Moxa driver—potential issues, edge cases, things that looked like bugs to an automated system. None of it mattered because the hardware was gone and nobody was using the driver. But the findings kept coming, and they kept requiring human attention to evaluate and dismiss. Kroah-Hartman's solution was straightforward: remove the whole thing. If there's no hardware, no users, and no maintainer willing to modernize the code, why keep it around just to feed AI scanners false positives?

The removal itself was not sudden. Jiri Slaby, who has maintained parts of the kernel's serial driver subsystem for years, had proposed dropping the Moxa code as far back as 2021. In May 2026, when a separate reorganization of the tty subsystem brought the topic back up, Crescent Hsieh from Moxa confirmed that both the hardware and its software support were completely phased out. The company even offered to help write the removal patch. But nothing happened until August, when Kroah-Hartman finally acted—three months after Moxa had already signed off.

The timing matters because it reveals something about how open source maintenance actually works. The decision to remove the driver was already made. The manufacturer had agreed. The maintainers knew it was dead weight. What AI did was create enough friction—enough false findings, enough scanning activity, enough low-level annoyance—that the removal became urgent rather than someday. It wasn't that AI discovered the driver should be removed. It was that AI made keeping it around more expensive than removing it.

Kroah-Hartman left the door slightly open, noting that the driver could theoretically return in the future if someone rewrote it in a more modern way. But realistically, that's not happening. The Intellio hardware is gone. The company that made it has moved on. And now the kernel is 2,148 lines lighter, freed from the burden of maintaining code for hardware that stopped existing nearly a decade ago. What remains to be seen is whether this becomes a pattern—whether AI code analysis will start forcing maintenance decisions across the entire open source ecosystem, not because the decisions are wrong, but because the noise becomes unbearable.