drmm_mutex_init(9)

💅 drmm_mutex_init(9) — the kernel API manual, bestie edition

okay so first things first, the manual is literally called drmm_mutex_init(9) and it lives in the Kernel API Manual — yes we're in kernel land today, put your hair up 🎀

---

✨ NAME ✨

drmm_mutex_init — the &drm_device-managed version of mutex_init(), no cap 🦋

---

🌸 SYNOPSIS 🌸

drmm_mutex_init (dev , lock );

like, that's the whole call. yes the spacing is quirky, that's just how it is, don't come for her 💅

---

🎀 ARGUMENTS 🎀

• dev — your DRM device. the main character here 👑
• lock — the lock you want to be initialized. she's getting set up ✨

---

🌈 RETURN 🌈

Returns 0 on success — slay — or a negative errno code otherwise 😭 so pls actually check it, bestie.

---

💖 DESCRIPTION 💖

So here's the tea: this is a drm_device-managed version of mutex_init. That's it, that's the vibe.

The way that it works is the initialized lock gets automatically destroyed on the final drm_dev_put — so you don't have to manually clean her up, the device handles it for you. it's giving responsible adult energy, honestly 🫶

---

🔥 SEE ALSO 🔥

• Kernel file ./include/drm/drm_managed.h
• drmm_add_action(9)
• drmm_add_action_or_reset(9)
• drmm_kzalloc(9)
• drmm_kmalloc_array(9)
• drmm_kcalloc(9)
• drmm_alloc_ordered_workqueue(9)

go read those next, iykyk 📚✨

---

okay that's the whole page, go be iconic with your managed mutexes 💜

sign-off vibes: this one came from ./include/drm, dated October 2026, and it's still literally drmm_mutex_init(9) — periodt 💅🎀🌸