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The code to handle the SMART_SUSPEND driver PM flag is hard to follow and somewhat inconsistent with respect to devices without middle-layer (subsystem) callbacks. Namely, for those devices the core takes the role of a middle layer in providing the expected ordering of execution of callbacks (under the assumption that the drivers setting SMART_SUSPEND can reuse their PM-runtime callbacks directly for system-wide suspend). To that end, it prevents driver ->suspend_late and ->suspend_noirq callbacks from being executed for devices that are still runtime-suspended in __device_suspend_late(), because running the same callback funtion that was previously run by PM-runtime for them may be invalid. However, it does that only for devices without any middle-layer callbacks for the late/noirq/early suspend/resume phases even though it would be simpler and more consistent to skip the driver-lavel callbacks for all devices with SMART_SUSPEND set that are runtime-suspended in __device_suspend_late(). Simplify the code in accordance with the above observation. Suggested-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Alan Stern <stern@rowland.harvard.edu>
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.