usb4_port_unlock(9)

📦 version 7.3.1, in nixpkgs unstable

✨ NAME ✨

Hiii bestie, meet usb4_port_unlock — the little kernel function whose whole job is to unlock a USB4 downstream port 💅 (she's living her best life in section 9 of the Kernel API Manual, usb4_port_unlock(9), iykyk 🎀).

🌸 SYNOPSIS 🌸

int usb4_port_unlock (struct tb_port *port );

🦋 ARGUMENTS 🦋

  • port — the USB4 port you're unlocking, bestie. That's it. That's the whole vibe check 🫶

💖 DESCRIPTION 💖

Okay so literally what this does: it unlocks the USB4 downstream port so that the connection manager can actually get at the router sitting below this port. That's the entire plot 🍓

Like, the port was locked, and now it's not, and the connection manager can go talk to the router underneath it. Main character energy for real 🔥

🔥 RETURN 🔥

  • 0 on success 🌈
  • a negative errno otherwise 💀
So if you get a negative number back, that's not slay, that's an error — no cap.

🎀 SEE ALSO 🎀

Kernel file ./drivers/thunderbolt/usb4.c — and literally the whole friend group, ngl. Here's everyone:

And that's the page, bestie! 🧚 This one's straight outta ./drivers/thunderbolt, dated October 2026, and yes the manual name really is usb4_port_unlock(9) — go off, iconic queen 👑💜

📦 where this page comes from