drm_modeset_backoff(9)

💅 drm_modeset_backoff — deadlock avoidance backoff ✨

okay so bestie, you know how sometimes things get messy and you just gotta pause, breathe, and let the universe work itself out? that's this function. literally. it's from the Kernel API Manual, section (9), and it's your get-out-of-deadlock free card 🫶

---

🌸 SYNOPSIS 🌸

int drm_modeset_backoff (struct drm_modeset_acquire_ctx *ctx );

---

🎀 ARGUMENTS 🎀

• ctx — the acquire context 💫 (yes queen, this is the context you're working with, hand her over)

---

🔥 DESCRIPTION 🔥

so here's the situation: if deadlock is detected — like, drm_modeset_lock returns -EDEADLK, which is basically the kernel screaming "we are SO stuck rn" 😭 — you must call this function. not "should", not "maybe if you feel like it". must. no cap.

what does it do? it drops all currently held locks and blocks until the contended lock becomes available. it's giving "let go of everything you're clinging to so the thing you actually want can reach you" ✨ main character energy fr fr.

this function returns 0 on success, or -ERESTARTSYS if this context is initialized with DRM_MODESET_ACQUIRE_INTERRUPTIBLE and the wait has been interrupted. rude of the wait to get interrupted, but okay, we deal 💅

🚨 bestie listen — if you hit -EDEADLK and don't call this, you're just gonna sit there deadlocked forever. don't do that to yourself.

---

👑 SEE ALSO 👑

• Kernel file ./drivers/gpu/drm/drm_modeset_lock.c
• kms locking(9)
• drm_modeset_lock_all(9)
• drm_modeset_unlock_all(9)
• drm_warn_on_modeset_not_all_locked(9)
• drm_modeset_acquire_init(9)
• drm_modeset_acquire_fini(9)
• drm_modeset_drop_locks(9)
• drm_modeset_lock_init(9)
• drm_modeset_lock(9)
• drm_modeset_lock_single_interruptible(9)
• drm_modeset_unlock(9)
• drm_modeset_lock_all_ctx(9)

---

and that's the whole vibe 💖 go drop your locks bestie, you got this 🦋

this lil page came from ./drivers/gpu/drm and it's stamped October 2026 — iconic, timeless, periodt. 🎀