tb_port_next_cap(9)

💅 tb_port_next_cap(9) — like, the Kernel API Manual bestie ✨

okay so real talk, this little icon lives in the Kernel API Manual and honestly? she's doing the most for the Thunderbolt crowd 🦋

---

✨ NAME ✨

tb_port_next_cap — returns the next capability in the linked list. that's it, that's the vibe 🎀

---

🌸 SYNOPSIS 🌸

int tb_port_next_cap (struct tb_port *port , unsigned int offset );

---

🫶 ARGUMENTS 🫶

• port — the port you're hunting a capability for 👀
• offset — the previous capability offset. pass 0 to start from the beginning, no cap 🧚

---

💖 DESCRIPTION 💖

so what she actually does: she finds the dword offset of the next capability in the port config space capability list. lowkey iconic.

and when you hand her 0 in the offset parameter? she gives you the first entry instead. if it exists, that is — no promises if the list is empty, bestie 😭

---

🔥 RETURN 🔥

• Double word offset of the first or next capability — on success, slay 💅
• 0 — if no next capability is found. she looked, it's not there, moving on 🙈
• Negative errno — some other error happened. yeah. that kind of day 💀

---

🌈 SEE ALSO 🌈

kernel file ./drivers/thunderbolt/cap.c, plus the whole friend group: tb_port_find_cap(9), tb_switch_next_cap(9), tb_switch_find_cap(9), tb_switch_find_vse_cap(9) — go say hi 🫶✨

---

ngl, if you're chaining these calls, remember 0 means "start over" — don't come for me if you accidentally restart the list, that's on you bestie 💀

---

mwah, that's a wrap 💜 this page came straight out of ./drivers/thunderbolt, dated October 2026, and it's tb_port_next_cap(9) — periodt 🌟