devm_uio_register_device(9)

💖 devm_uio_register_device(9) 💖

okay so first things first, bestie: this is a page straight out of the Kernel API Manual — yes, that is the manual name, we're in the kernel docs now, main character energy only. The star of the show is devm_uio_register_device, and the whole point of her is that she's the resource-managed version of uio_register_device(). Resource managed, as in devm, as in the kernel handles cleanup for you and you can simply ✨live✨. 🦋

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🌸 NAME 🌸

devm_uio_register_device — the resource managed uio_register_device(). that's it, that's the vibe. 🎀

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✨ SYNOPSIS ✨

devm_uio_register_device (parent , info );

no cap, that's the whole signature. two arguments, zero drama (until you read the return value, but we'll get there 😭).

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🎀 ARGUMENTS 🎀

• parent — the parent device. the one who's, like, responsible for this whole situation. 👑
• info — the UIO device capabilities. everything you're allowed to do, packaged up cute in here. 💅

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💫 DESCRIPTION 💫

so what does she return? literally just this, and it's important so don't skim:

returns zero on success or a negative error code.

that's it. zero? slay, you're registered. negative? 💀 something went wrong, and the negative error code tells you what. no ambiguity, no mystery, very much giving "the vibes are documented".

careful bestie — zero is success and negative is failure. a positive number does not mean "extra success", okay? negative error code, periodt. 🔥

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🌈 SEE ALSO 🌈

the kernel file ./include/linux/uio_driver.h — go look, she's iconic:

• struct uio_mem(9)
• struct uio_port(9)
• struct uio_info(9)
• and of course uio_register_device(9) — the whole reason this devm version even exists 🫶

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💜 that's a wrap 💜

source path is ./include/linux, and this little masterpiece is dated October 2026 — yes, born in the future, ahead of her time fr fr. go forth, register your UIO devices, let the kernel do the cleanup, and remember: zero on success, negative on nope. bye bestie, ily, mwah 💖🎀✨