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The map->work_buf is a buffer preallocated in __regmap_init() with size allowing it to store all 3 parts of a buffer - reg, pad and val. While reg and val parts are always properly setup before each transaction, the pad part is left at its default value (zeros). Until it is overwritten, that is. _regmap_bus_read(), when calling _regmap_raw_read() uses beginning of work_buf as a place to store data read. Usually that is fine but if val_bits > reg_bits && pad_bits > 0, padding area of work_buf() may get overwritten. Since padding is not zeroed before each transaction, garbage will be used on next calls. This patch moves the val pointer used for _regmap_raw_read() to point to a part of work_buf intended for storing value read. Signed-off-by: Krzysztof Adamski <krzysztof.adamski@nokia.com> Signed-off-by: Mark Brown <broonie@kernel.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.