mucse_release_mbx_lock_pf(9)

📦 version 7.3.1, in nixpkgs unstable

💅 mucse_release_mbx_lock_pf — the Kernel API Manual said "let her go"

okay so bestie, listen. This one lives in the Kernel API Manual, and honestly? It's the other half of a duo. The "you hang up first" of PCIe mailbox locking. Let's get into it 🎀

✨ NAME ✨

mucse_release_mbx_lock_pf — Release mailbox lock. That's it. That's the whole job. Iconic, minimal, no notes 🫶

🌸 SYNOPSIS 🌸

void mucse_release_mbx_lock_pf (struct mucse_hw *hw , bool req );

void return, no drama, no return value to worry about. We love a function that just does the thing and leaves 💅

🦋 ARGUMENTS 🦋

  • hw — pointer to the HW structure. Like, the whole hardware vibe lives in here. You need it. Don't pass a weird one 🙈
  • req — send a request or not. Yes/no, this-or-that, the bool of it all. If it's true, we're sending a request along for the ride. If it's false, we're just doing the release and clocking out ✨

💖 DESCRIPTION 💖

So here's the tea: this function is the designated pair of mucse_obtain_mbx_lock_pf. You know, the "obtain" and "release" duo — they literally only work if you call them together. It's giving main character energy and its emotional support bestie 🌈

What it actually does, in order of iconicness:

  • Releases the mailbox lock by clearing MUCSE_MBX_PFU — that's the bit that says "she's mine", and we're letting it go 🕊️
  • Simultaneously sends the request by setting MUCSE_MBX_REQ — but only if req is true. Which is lowkey the efficient part, because both bits are in the same mailbox control register, so the operations are combined. One trip, two jobs. Efficiency ate, fr fr 🔥
ngl the combined-register thing is the whole reason this is one function and not two. Both bits, one register, one write. She's organized 💅

⭐ SEE ALSO ⭐

the whole friend group, no cap:

aaaand that's the page, bestie 🍓 source/version biz: ./drivers/net/ethernet/mucse/r... — dated October 2026, still serving mucse_release_mbx_lock_pf(9) realness. go release that lock. you got this 💜✨

📦 where this page comes from