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e358bad75f
The runtime PM documentation in Documentation/power/runtime_pm.txt doesn't say that pm_runtime_enable() and pm_runtime_disable() work by operating on power.disable_depth, which is wrong, because the possibility of nesting disables doesn't follow from the description of these functions. Also, there is no description of pm_runtime_barrier() at all in the document, which is confusing. Improve the documentation by fixing those issues. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>