media_devnode_register(9)

💅 media_devnode_register(9) — Kernel API Manual ✨

okay so bestie, welcome to the Kernel API Manual — today's main character is media_devnode_register, and she's literally the one who gets your shiny new device node a spot in the kernel 😤👑

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🌸 NAME 🌸

media_devnode_register — register a media device node 🎀

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✨ SYNOPSIS ✨

int media_devnode_register (struct media_device *mdev , struct
       media_devnode *devnode , struct module *owner );

like, three args, no cap. let's get into them 💅

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🦋 ARGUMENTS 🦋

• mdev — the struct media_device we want to register a device node for 🫶
• devnode — the media device node structure we want to register, queen of the hour 👑
• owner — should be filled with THIS_MODULE, fr fr. no exceptions, that's her whole personality ✨

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💖 DESCRIPTION 💖

so what actually happens?? the registration code assigns minor numbers and registers the new device node with the kernel. that's the whole vibe 🌈

and if no free minor number can be found? 😭 error returned. if the registration of the device node fails? also error. she does not do partial credit, bestie 💀

on success you get zero back. zero = slay ✅

⚠️ okay this part is IMPORTANT, pay attention: if the media_devnode_register call fails, the release callback of the media_devnode structure is not called. so the caller is responsible for freeing any data. like, you have to clean up your own mess, nobody's coming to save you 🙈💀

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🧚 SEE ALSO 🧚

• Kernel file ./include/media/media-devnode.h struct media_file_operations(9)
• struct media_devnode(9)
• media_devnode_unregister_prepare(9)
• media_devnode_unregister(9)
• media_devnode_data(9)
• media_devnode_is_registered(9)

these are her friends, go say hi 🫶 go read them, iykyk 💜

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and that's the page!! written from ./include/media, dated October 2026 — mwah, go register something iconic 💋🎀⭐