nanddev_mtd_max_bad_blocks(9)

✨ nanddev_mtd_max_bad_blocks ✨

okay so bestie, welcome to the nanddev_mtd_max_bad_blocks page from the Kernel API Manual — yes it's a kernel function, yes it's a whole mouthful to say out loud, and yes we're gonna get through it together 💅

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🌸 NAME 🌸

nanddev_mtd_max_bad_blocks — literally the function that gets you the max number of bad eraseblocks on a specific region of the NAND device. that's it, that's the vibe 🎀

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🦋 SYNOPSIS 🦋

int nanddev_mtd_max_bad_blocks (struct mtd_info *mtd , loff_t offs ,
       size_t len );

look at that signature. iconic. three args, returns an int, no notes 👑

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💖 ARGUMENTS 💖

• mtd — the MTD device itself. the main character, honestly 🫶
• offs — the offset of the NAND region you're curious about, type loff_t
• len — the length of that NAND region, type size_t

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🌈 DESCRIPTION 🌈

so this is the default implementation for mtd->_max_bad_blocks. that's the hook it's backing, no cap.

⚠️ heads up bestie: it only works if nand->memorg.max_bad_eraseblocks_per_lun is > 0. like, that's the whole vibe check. if that value isn't greater than zero, this thing is not gonna cooperate. periodt.

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⭐ RETURN ⭐

• a positive number encoding the maximum number of eraseblocks on a portion of memory — slay, that's your answer 💖
• a negative error code otherwise 😭 — so always check the sign, iykyk

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👑 SEE ALSO 👑

the kernel file itself lives at ./drivers/mtd/nand/core.c — go read it, it ate 🔥

and then the whole friend group of related functions, all of them, not skipping a single one:

• nand_check_erased_buf(9)
• nand_check_erased_ecc_chunk(9)
• nanddev_isbad(9)
• nanddev_markbad(9)
• nanddev_isreserved(9)
• nanddev_erase(9)
• nanddev_mtd_erase(9)
• nanddev_get_ecc_engine(9)
• nanddev_put_ecc_engine(9)
• nanddev_find_ecc_configuration(9)
• nanddev_ecc_engine_init(9)
• nanddev_ecc_engine_cleanup(9)
• nanddev_init(9)
• nanddev_cleanup(9)

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and that's the page!! 💜 this little gem comes to you courtesy of ./drivers/mtd/nand, dated October 2026 — so it's got that fresh-out-the-oven energy 🍓 go forth and count your bad blocks bestie, mwah 🧚💅