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15a73839e3
The should_stop_polling() function wraps the function thermal_zone_device_is_enabled(). The monitor_thermal_zone() function checks if the thermal zone is enabled via the should_stop_polling() function. However, the instant after checking the thermal zone is enabled, this one can be disabled, so even if that reduces the race window, it does not prevent that and the monitoring can be set again with the thermal zone disabled. For this reason, the function should_stop_polling() is replaced by a direct check of the thermal zone mode with the mutex locks held, that prevents the situation described above. As the semantic is clear with the thermal_zone_is_enabled() function, we can remove the should_stop_polling() function and replace the check with the former function. While at it, reorder the checks to improve the readability of the monitor_thermal_zone() function. In the future, the thermal_zone_device_disable() and the thermal_zone_device_enable() functions should unset / set the polling timer directly instead of relying on the next thermal_zone_device_update() call to do that. That will make a synchronous thermal zone mode change but the locking scheme should be double checked for that which out of the scope of this change. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20220805153834.2510142-2-daniel.lezcano@linaro.org |
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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.