efi_capsule_update_locked(9)

💖 efi_capsule_update_locked(9) 💖

okay bestie, welcome to the Kernel API Manual entry for efi_capsule_update_locked(9) — yes, the manual name is literally right there, we're being efficient 💅

---

✨ NAME ✨

efi_capsule_update_locked — pass a single capsule to the firmware 🫶

---

🌸 SYNOPSIS 🌸

the whole signature, copied exactly, no cap:

       int efi_capsule_update_locked (efi_capsule_header_t *capsule , struct
       page **sg_pages , int reset );

---

🎀 ARGUMENTS 🎀

• capsule — capsule to send to the firmware 💌
• sg_pages — array of scatter gather (block descriptor) pages 🧚
• reset — the reset type required for capsule 🔥

---

🦋 DESCRIPTION 🦋

okay so the vibe here is locked-function energy 💅 Since this function must be called under capsule_mutex, it checks whether efi_reset_type will conflict with reset, and atomically sets it and capsule_pending if a capsule was successfully sent to the firmware. ✨

it also checks to see if the system is about to restart, and if so, it aborts — like, bye 🙈. This avoids races between efi_capsule_update and efi_capsule_pending, periodt. 💖

---

💜 SEE ALSO 💜

• Kernel file: ./drivers/firmware/efi/capsule.c
• efi_capsule_pending(9)
• efi_capsule_supported(9)
• efi_capsule_update(9)

---

mwah 💋 source/version: ./drivers/firmware/efi · date: October 2026 · page name: efi_capsule_update_locked(9) — that's the footer, folded into a cute sign-off, periodt. 🎀