get_mtd_device(9)

💅 get_mtd_device(9) — like, the Kernel API Manual, bestie

okay so real talk: this is a page from the Kernel API Manual, and it's about get_mtd_device — the function that hands you a validated handle for an MTD device. think of it like a bouncer at the club door of memory technology devices, checking IDs before anyone gets in 🫶

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✨ NAME ✨

get_mtd_device — obtain a validated handle for an MTD device. periodt.

🌸 SYNOPSIS 🌸

struct mtd_info * get_mtd_device (struct mtd_info *mtd , int num );

like, that's the whole vibe. one function, two args, so iconic 💅

🦋 ARGUMENTS 🦋

• mtd — the last known address of the MTD device you're looking for. not a promise, just the last place you saw it 👀
• num — the internal device number of the MTD device you want. it's the device's little house number in the table 🏠

🎀 DESCRIPTION 🎀

okay so there are basically three modes here and you gotta know which one you're in, no cap:

1. you give a number and a NULL address → it returns the num'th entry in the device table, if any. simple, clean, slay ✨
2. you give an address and num == -1 → it searches the device table for a device with that address and returns it if it's still present. past tense energy, fr fr — it might have ghosted 👻
3. you give both → it returns the num'th driver only if its address matches. like, both receipts gotta line up 💀

and if none of that works out? it returns an error code. them's the rules 😭

ngl, "return error code if not" is doing a lot of heavy lifting in that sentence, but that's literally what the original says, so we're keeping it exactly like that 🔥

🌈 SEE ALSO 🌈

the kernel file ./drivers/mtd/mtdcore.c — that's the main character right there 👑

and then the whole friend group, in order:

• mtd_wunit_to_pairing_info(9)
• mtd_pairing_info_to_wunit(9)
• mtd_pairing_groups(9)
• add_mtd_device(9)
• del_mtd_device(9)
• mtd_device_parse_register(9)
• mtd_device_unregister(9)
• register_mtd_user(9)
• unregister_mtd_user(9)
• of_get_mtd_device_by_node(9)
• get_mtd_device_nm(9)
• mtd_ooblayout_ecc(9)
• mtd_ooblayout_free(9)
• mtd_ooblayout_find_region(9)
• mtd_ooblayout_find_eccregion(9)
• mtd_ooblayout_get_bytes(9)
• mtd_ooblayout_set_bytes(9)
• mtd_ooblayout_count_bytes(9)
• mtd_ooblayout_get_eccbytes(9)
• mtd_ooblayout_set_eccbytes(9)
• mtd_ooblayout_get_databytes(9)
• mtd_ooblayout_set_databytes(9)
• mtd_ooblayout_count_freebytes(9)
• mtd_ooblayout_count_eccbytes(9)
• mtd_kmalloc_up_to(9)

like, that's a lot of ooblayout, and honestly? obsessed. go read them, iykyk 📚💖

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and that's the page!! sign-off time: the source is ./drivers/mtd, the version date is October 2026, and the whole thing lives under get_mtd_device(9) — bye bestie, go get that validated handle 🧚‍♀️⭐💜