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As the PM core may invoke the *noirq() callbacks asynchronously, the current lock-less approach in genpd doesn't work. The consequence is that we may find concurrent operations racing to power on/off the PM domain. As of now, no immediate errors has been reported, but it's probably only a matter time. Therefor let's fix the problem now before this becomes a real issue, by deploying the locking scheme to the relevant functions. Reported-by: Brian Norris <briannorris@chromium.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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.