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The recently added support for disabling the regmap internal locking left debugfs enabled for devices with the locking disabled. This is a problem since debugfs allows userspace to do things like initiate reads from the hardware which will use the scratch buffers protected by the regmap locking so could cause data corruption. For safety address this by just disabling debugfs for these devices. That is overly conservative since some of the debugfs files just read internal data structures but it's much simpler to implmement and less likely to lead to problems with tooling that works with debugfs. Reported-by: Lars-Peter Clausen <lars@metafoo.de> 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.