From 67b967ddd93d0ed57d392a00f6f90060f0910c0e Mon Sep 17 00:00:00 2001 From: Miquel Raynal Date: Thu, 18 Nov 2021 12:46:59 +0100 Subject: mtd: Introduce an expert mode for forensics and debugging purposes When developping NAND controller drivers or when debugging filesystem corruptions, it is quite common to need hacking locally into the MTD/NAND core in order to get access to the content of the bad blocks. Instead of having multiple implementations out there let's provide a simple yet effective specific MTD-wide debugfs entry to fully disable these checks on purpose. A warning is added to inform the user when this mode gets enabled. Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20211118114659.1282855-1-miquel.raynal@bootlin.com --- drivers/mtd/nand/raw/nand_base.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/mtd/nand/raw/nand_base.c') diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c index 3d6c6e880520..b3a9bc08b4bb 100644 --- a/drivers/mtd/nand/raw/nand_base.c +++ b/drivers/mtd/nand/raw/nand_base.c @@ -321,6 +321,9 @@ static int nand_isbad_bbm(struct nand_chip *chip, loff_t ofs) if (nand_region_is_secured(chip, ofs, mtd->erasesize)) return -EIO; + if (WARN_ONCE(mtd_expert_analysis_mode, mtd_expert_analysis_warning)) + return 0; + if (chip->legacy.block_bad) return chip->legacy.block_bad(chip, ofs); -- cgit v1.2.3