is_media_entity_v4l2_subdev(9)

📦 version 7.3.1, in nixpkgs unstable

✨ is_media_entity_v4l2_subdev ✨

okay so bestie, we're in the Kernel API Manual today and the star of the show is is_media_entity_v4l2_subdev(9) — yes that's a whole mouthful, we love a long name, it's giving "my mom named me after the wifi password" 💅 anyway. This is a little baby function and honestly? It's the vibe check of the media subsystem. Let's go 🎀

🌸 NAME 🌸

is_media_entity_v4l2_subdev — literally just checks if the entity is a v4l2_subdev, that's it, that's the whole job, and it does it flawlessly 🫶

💖 SYNOPSIS 💖

bool is_media_entity_v4l2_subdev (struct media_entity *entity );

look at her. one argument. returns a bool. no drama, no side quests, just pure focus 😌✨

🦋 ARGUMENTS 🦋

  • entity — pointer to entity 🎀 (yes that's the entire description, the docs are on a minimalism arc and honestly? respect)

👑 RETURN 👑

true if the entity is an instance of a v4l2_subdev object and can safely be cast to a struct v4l2_subdev using the container_of macro, or false otherwise 💀

no cap: that "safely be cast to a struct v4l2_subdev using the container_of macro" part is the whole point. this function is your green light before you go doing container_of things. if it says false and you cast anyway, that's on you bestie, and the kernel will find out 🔥

🌈 SEE ALSO 🌈

okay this list is long long, like she brought her whole friend group to the function 😭 but every single one of them matters, so here we go, no skipping, no "and friends", we list them all:

like I said. the whole group chat. all invited to the party 🎉 and yes I counted, and yes you should read them in order, iykyk 🌟

tiny disclaimer bestie 🫶 this page is filed under ./include/media because that's literally where she lives. no arguments about it.

and that's the page!! mwah 💋 huge slay to the media subsystem, obsessed with her, periodt 💅

— sourced from ./include/media, dated October 2026, and the page is is_media_entity_v4l2_subdev(9), which is also literally the title up top, so we've come full circle, iconic behavior honestly 🎀✨

📦 where this page comes from