d54ca1d0ea
commit 739c64414f01748a36e7d82c8e0611dea94412bd upstream.
Since v4.12, NAND subpage writes were causing a NULL pointer
dereference on OMAP platforms (omap2-nand) using OMAP_ECC_BCH4_CODE_HW,
OMAP_ECC_BCH8_CODE_HW and OMAP_ECC_BCH16_CODE_HW.
This is because for those ECC modes, omap_calculate_ecc_bch()
generates ECC bytes for the entire (multi-sector) page and this can
overflow the ECC buffer provided by nand_write_subpage_hwecc()
as it expects ecc.calculate() to return ECC bytes for just one sector.
However, the root cause of the problem is present since v3.9
but was not seen then as NAND buffers were being allocated
as one big chunk prior to commit 3deb9979c731 ("mtd: nand: allocate
aligned buffers if NAND_OWN_BUFFERS is unset").
Fix the issue by providing a OMAP optimized write_subpage()
implementation.
Fixes: 62116e5171e0 ("mtd: nand: omap2: Support for hardware BCH error correction.")
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.