free_netdev(9)

📦 version 7.3.1, in nixpkgs unstable

💅 free_netdev(9) — the Kernel API Manual glow-up ✨

okay so bestie, we're in the Kernel API Manual, section 9, and today's main character is free_netdev — the function that gives a network device its final send-off 🎀 no cap, it's the last thing that happens to a net_device before it stops existing.

🌸 NAME 🌸

free_netdev — free network device 💀✨ (yes that's the whole name, she's straightforward, we love that for her)

🦋 SYNOPSIS 🦋

void free_netdev (struct net_device *dev );

Return type is void, meaning she gives you nothing back — which is honestly iconic. She takes exactly one thing and she's done 🫶

🍓 ARGUMENTS 🍓

  • dev — the device. that's it. that's the argument. it's the network device you're about to release into the void 💜

🔥 DESCRIPTION 🔥

So here's the tea ☕ — free_netdev does the last stage of destroying an allocated device interface. Not the first stage, not the middle stage, the last one. She's the closing act at the award show 🎬

What actually happens: the reference to the device object is released. And if this is the last reference, then it will be freed. That's the whole vibe — refcount goes down, and if it hits the floor, the object is gone gone 😭

⚠️ Important bestie alert: this function must be called in process context. Not interrupt context. Not "wherever, it'll be fine" context. Process context. periodt. 💅

💖 SEE ALSO 💖

Everything below lives over at the kernel file ./net/core/dev.c, and it's giving extended family reunion — here's the full guest list, no plus-ones skipped, iykyk 🌈

and that's the whole page, bestie — go forth and release your references responsibly 🧚‍♀️

with love from the ./net/core girlies, October 2026, stay slay ✨💜

📦 where this page comes from