The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x d2d73a6dd17365c43e109263841f7c26da55cfb0 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024042954-throwaway-recluse-d3a6@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..
Possible dependencies:
d2d73a6dd173 ("mtd: limit OTP NVMEM cell parse to non-NAND devices") 2cc3b37f5b6d ("nvmem: add explicit config option to read old syntax fixed OF cells")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From d2d73a6dd17365c43e109263841f7c26da55cfb0 Mon Sep 17 00:00:00 2001 From: Christian Marangi ansuelsmth@gmail.com Date: Fri, 12 Apr 2024 12:50:26 +0200 Subject: [PATCH] mtd: limit OTP NVMEM cell parse to non-NAND devices
MTD OTP logic is very fragile on parsing NVMEM cell and can be problematic with some specific kind of devices.
The problem was discovered by e87161321a40 ("mtd: rawnand: macronix: OTP access for MX30LFxG18AC") where OTP support was added to a NAND device. With the case of NAND devices, it does require a node where ECC info are declared and all the fixed partitions, and this cause the OTP codepath to parse this node as OTP NVMEM cells, making probe fail and the NAND device registration fail.
MTD OTP parsing should have been limited to always using compatible to prevent this error by using node with compatible "otp-user" or "otp-factory".
NVMEM across the years had various iteration on how cells could be declared in DT, in some old implementation, no_of_node should have been enabled but now add_legacy_fixed_of_cells should be used to disable NVMEM to parse child node as NVMEM cell.
To fix this and limit any regression with other MTD that makes use of declaring OTP as direct child of the dev node, disable add_legacy_fixed_of_cells if we detect the MTD type is Nand.
With the following logic, the OTP NVMEM entry is correctly created with no cells and the MTD Nand is correctly probed and partitions are correctly exposed.
Fixes: 4b361cfa8624 ("mtd: core: add OTP nvmem provider support") Cc: stable@vger.kernel.org # v6.7+ Signed-off-by: Christian Marangi ansuelsmth@gmail.com Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/20240412105030.1598-1-ansuelsmth@gmail.com
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 5887feb347a4..0de87bc63840 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -900,7 +900,7 @@ static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd, config.name = compatible; config.id = NVMEM_DEVID_AUTO; config.owner = THIS_MODULE; - config.add_legacy_fixed_of_cells = true; + config.add_legacy_fixed_of_cells = !mtd_type_is_nand(mtd); config.type = NVMEM_TYPE_OTP; config.root_only = true; config.ignore_wp = true;