v4l2_subdev...active_state(9)

📦 version 7.3.1, in nixpkgs unstable

💅 v4l2_subdev_get_locked_active_state(9) — like, the whole vibe 💅

okay so bestie, welcome to the Kernel API Manual ✨ this little page is all about v4l2_subdev_get_locked_active_state, and honestly? she's a one-job icon and she does that job flawlessly 🎀

🌸 NAME 🌸

v4l2_subdev_get_locked_active_state — she checks that the active subdev state is locked and then hands it right back to you, no cap 💖

✨ SYNOPSIS ✨

struct v4l2_subdev_state * v4l2_subdev_get_locked_active_state (struct v4l2_subdev *sd );

🦋 ARGUMENTS 🦋

  • sd — the subdevice. that's her. that's the main character 🫶

💜 DESCRIPTION 💜

So here's the tea 🍓 — this function returns the active state for the subdevice. and if the subdev doesn't even support active state? you get NULL. that's it, that's the whole answer, no drama 💀

But wait, there's more (iykyk). If the state is not NULL, she calls lockdep_assert_held to throw a warning if the state isn't locked. miss thing is literally doing a vibe check on your locking 🔥

and like, the whole point: this function is to be used when the caller knows that the active state is already locked. she's not here to lock it for you, bestie, she's here to confirm you already did 😭

👑 SEE ALSO 👑

First off, the source of all this lore lives in the kernel file ./include/media/v4l2-subdev.h 📁 — go say hi to her.

And then, the extended fam 🌈 (yes, all of them, every single one, we don't do omissions here):

and that's the page, bestie 🧚 she ate, she left no crumbs. this one lives in ./include/media and the version stamp says October 2026 — so yeah, mark your calendar, screenshot it, put it on your fridge 💖✨💅

📦 where this page comes from