linux-stable.git/drivers/mtd, branch v6.18

mtd: onenand: Pass correct pointer to IRQ handler

2025-11-03T10:37:57+00:00

This was supposed to pass "onenand" instead of "&onenand" with the
ampersand.  Passing a random stack address which will be gone when the
function ends makes no sense.  However the good thing is that the pointer
is never used, so this doesn't cause a problem at run time.

Fixes: e23abf4b7743 ("mtd: OneNAND: S5PC110: Implement DMA interrupt method")
Signed-off-by: Dan Carpenter 
Signed-off-by: Miquel Raynal

mtd: spinand: fmsh: remove QE bit for FM25S01A flash

2025-11-03T10:33:04+00:00

According to datasheet (http://eng.fmsh.com/nvm/FM25S01A_ds_eng.pdf)
there is no QE (Quad Enable) bit for FM25S01A flash, so remove it.

Fixes: 5f284dc15ca86 ("mtd: spinand: add support for FudanMicro FM25S01A")
Signed-off-by: Mikhail Kshevetskiy 
Tested-by: Tianling Shen 
Signed-off-by: Miquel Raynal

mtd: rawnand: cadence: fix DMA device NULL pointer dereference

2025-10-23T07:03:13+00:00

The DMA device pointer `dma_dev` was being dereferenced before ensuring
that `cdns_ctrl->dmac` is properly initialized.

Move the assignment of `dma_dev` after successfully acquiring the DMA
channel to ensure the pointer is valid before use.

Fixes: d76d22b5096c ("mtd: rawnand: cadence: use dma_map_resource for sdma address")
Cc: stable@vger.kernel.org
Signed-off-by: Niravkumar L Rabara 
Signed-off-by: Miquel Raynal

mtd: rawnand: realtek: Make rtl_ecc_engine_ops const

2025-10-22T09:54:42+00:00

The rtl_ecc_engine_ops structure is only used to provide a set of
callback functions and is never modified after initialization.
Mark it as const so it can be placed in the read-only section, which
improves safety and allows better compiler optimization.

Signed-off-by: Li Qiang 
Signed-off-by: Miquel Raynal

mtd: nand: MTD_NAND_ECC_REALTEK should depend on HAS_DMA

2025-10-22T09:54:29+00:00

If CONFIG_NO_DMA=y:

    ERROR: modpost: "dma_free_pages" [drivers/mtd/nand/ecc-realtek.ko] undefined!
    ERROR: modpost: "dma_alloc_pages" [drivers/mtd/nand/ecc-realtek.ko] undefined!

The driver cannot function without DMA, hence fix this by adding a
dependency on HAS_DMA.

Fixes: 3148d0e5b1c5733d ("mtd: nand: realtek-ecc: Add Realtek external ECC engine support")
Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Miquel Raynal

mtd: nand: realtek-ecc: Fix a IS_ERR() vs NULL bug in probe

2025-10-22T09:54:18+00:00

The dma_alloc_noncoherent() function doesn't return error pointers, it
returns NULL on error.  Fix the error checking to match.

Fixes: 3148d0e5b1c5 ("mtd: nand: realtek-ecc: Add Realtek external ECC engine support")
Signed-off-by: Dan Carpenter 
Reviewed-by: Geert Uytterhoeven 
Signed-off-by: Miquel Raynal

mtdchar: fix integer overflow in read/write ioctls

2025-10-22T09:53:59+00:00

The "req.start" and "req.len" variables are u64 values that come from the
user at the start of the function.  We mask away the high 32 bits of
"req.len" so that's capped at U32_MAX but the "req.start" variable can go
up to U64_MAX which means that the addition can still integer overflow.

Use check_add_overflow() to fix this bug.

Fixes: 095bb6e44eb1 ("mtdchar: add MEMREAD ioctl")
Fixes: 6420ac0af95d ("mtdchar: prevent unbounded allocation in MEMWRITE ioctl")
Cc: stable@vger.kernel.org
Signed-off-by: Dan Carpenter 
Signed-off-by: Miquel Raynal

Merge tag 'mtd/for-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux

2025-10-04T22:50:37+00:00

Pull MTD updates from Miquel Raynal:
 "MTD core:
   - Bad blocks increment is skipped if the block is already known bad
     (improves user statistics relevance)
   - Expose the OOB layout via debugfs

  Raw NAND:
   - Add support for Loongson-2K1000 and Loongson-2K0500 NAND
     controllers, including extra features, such as chip select
     and 6-byte NAND ID reading support
   - Drop the s3c2410 driver

  SPI NAND:
   - Important SPI NAND continuous read improvements and fixes
   - Add support for FudanMicro FM25S01A
   - Add support for continuous reads in Gigadevice vendor driver

  ECC:
   - Add support for the Realtek ECC engine

  SPI NOR:

   - Some flashes can't perform reads or writes with start or end being
     an odd number in Octal DTR mode. File systems like UBIFS can
     request such reads or writes, causing the transaction to error out.

     Pad the read or write transactions with extra bytes to avoid this
     problem.

  And the usual amount of various miscellaneous fixes"

* tag 'mtd/for-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux: (46 commits)
  mtd: rawnand: sunxi: drop unused module alias
  mtd: rawnand: stm32_fmc2: drop unused module alias
  mtd: rawnand: rockchip: drop unused module alias
  mtd: rawnand: pl353: drop unused module alias
  mtd: rawnand: omap2: drop unused module alias
  mtd: rawnand: atmel: drop unused module alias
  mtd: onenand: omap2: drop unused module alias
  mtd: hyperbus: hbmc-am654: drop unused module alias
  mtd: jedec_probe: use struct_size() helper for cfiq allocation
  mtd: cfi: use struct_size() helper for cfiq allocation
  mtd: nand: raw: gpmi: fix clocks when CONFIG_PM=N
  mtd: rawnand: omap2: fix device leak on probe failure
  mtd: rawnand: atmel: Fix error handling path in atmel_nand_controller_add_nands
  mtd: nand: realtek-ecc: Add Realtek external ECC engine support
  dt-bindings: mtd: Add realtek,rtl9301-ecc
  mtd: spinand: repeat reading in regular mode if continuous reading fails
  mtd: spinand: try a regular dirmap if creating a dirmap for continuous reading fails
  mtd: spinand: fix direct mapping creation sizes
  mtd: rawnand: fsmc: Default to autodetect buswidth
  mtd: nand: move nand_check_erased_ecc_chunk() to nand/core
  ...

Merge tag 'nand/for-6.18' into mtd/next

2025-10-03T15:23:18+00:00

* Raw NAND:
- Add support for Loongson-2K1000 and Loongson-2K0500 NAND controllers,
  including extra features, such as chip select and 6-byte NAND ID
  reading support.
- Drop the s3c2410 driver.

* SPI NAND:
- Important SPI NAND continuous read improvements and fixes.
- Add support for FudanMicro FM25S01A.
- Add support for continuous reads in Gigadevice vendor driver.

* ECC:
- Add support for the Realtek ECC engine.

This PR comes with the usual amount of various miscellaneous fixes.

Signed-off-by: Miquel Raynal

Merge tag 'spi-nor/for-6.18' into mtd/next

2025-10-03T15:23:08+00:00

SPI NOR changes for 6.18

Notable changes:

- Some flashes can't perform reads or writes with start or end being an
  odd number in Octal DTR mode. File systems like UBIFS can request such
  reads or writes, causing the transaction to error out. Pad the read or
  write transactions with extra bytes to avoid this problem.

Signed-off-by: Miquel Raynal