snd_lookup_minor_data(9)

💅 snd_lookup_minor_data — the kernel API manual, but make it make sense ✨

okay so bestie, buckle up 🎀 this one is a kernel API page, from the snd_lookup_minor_data(9) corner of the universe, and honestly it's giving "small function, big responsibility" energy. Let's get into it 💖

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✨ NAME ✨

snd_lookup_minor_data — literally just: go get the user data of a registered device 🫶

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🌸 SYNOPSIS 🌸

void * snd_lookup_minor_data (unsigned int minor , int type );

that's it. that's the whole call. two args, one pointer out. no cap. 💅

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🦋 ARGUMENTS 🦋

• minor — the minor number. yep, the minor number. that's the whole vibe of this one 🎀
• type — the device type, and it's one of the SNDRV_DEVICE_TYPE_XXX values 👑

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💜 DESCRIPTION 💜

so what does it do? it checks that a minor device with the specified type is actually registered, and then it returns its user data pointer. simple. iconic. no notes. ✨

but here's the part you actually need to remember, bestie, and i'm saying it louder because it matters:

this function increments the reference counter of the card instance if an associated instance with the given minor number and type is found. so you, the caller, must call snd_card_unref appropriately later. don't forget. this is not a drill 😭

like fr fr, it hands you a ref and you gotta give it back. main character energy comes with main character responsibilities 🫶

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⭐ RETURN ⭐

• the user data pointer — if the specified device is found 💖
• NULL — otherwise. (the "no device, no data, no problem" path 🌈)

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🔥 SEE ALSO 🔥

• Kernel file ./sound/core/sound.c
• snd_request_card(9)
• snd_register_device(9)
• snd_unregister_device(9)

go read those too, iykyk 👑

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and that's the page!! 🎀 this one lives down in ./sound/core, and the source/version + date info is chillin' right there at the bottom: ./sound/core, October 2026, snd_lookup_minor_data(9). slay, go unref your cards, mwah 💋💖🧚