pcim_release_region(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pcim_release_region — Kernel API Manual ✨

okay bestie, welcome to pcim_release_region(9), a little function from the Linux kernel's PCI devres corner of the world 🎀 it does exactly one thing and it does it iconically: it lets go of a PCI BAR you grabbed earlier. no cap, that's the whole plot.

🌸 NAME 🌸

pcim_release_region — release a PCI BAR 🫶

✨ SYNOPSIS ✨

void pcim_release_region (struct pci_dev *pdev , int bar );

so it returns void, meaning it gives you nothing back — no return value, no "did it work," nada. it just does the thing. main character energy fr 💅

🦋 ARGUMENTS 🦋

  • pdev — the PCI device you're operating on, aka the star of the show 💖
  • bar — the index of the BAR you want to release, aka which one you're letting go of 🎀

💜 DESCRIPTION 💜

okay so listen 👑 — this is how you release a region manually that was previously requested by pcim_request_region. that's it. that's the vibe. you asked for it, now you're giving it back, and honestly? growth. 🌱

it's a manual release, bestie — the whole point is that you're doing it yourself, so don't forget to actually call it. 😭

🌈 SEE ALSO 🌈

the whole friend group shows up here, and they're all in the kernel file ./drivers/pci/devres.c 🧚 — go say hi to:

💫 sign-off 💫

this little love letter to PCI devres lives in ./drivers/pci, dated October 2026, and it's the pcim_release_region(9) page from the Kernel API Manual — slay, go release some BARs responsibly, mwah 🍓💅✨

📦 where this page comes from