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82586a7215
A PM-runtime device usage count underflow is potentially critical, because it may cause a device to be suspended when it is expected to be operational. It is also a programming problem that would be good to catch and warn about. For this reason, (1) make rpm_check_suspend_allowed() return an error when the device usage count is negative to prevent devices from being suspended in that case, (2) introduce rpm_drop_usage_count() that will detect device usage count underflows, warn about them and fix them up, and (3) use it to drop the usage count in a few places instead of atomic_dec_and_test(). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.