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In hotplug logic, it always indicates non-specific failure to platform through _OST when handing ACPI hot-remove event failed. Then platform terminates the hot-remove process but it can not identify the reason. Base on current hot-remove code, there have two situations that it returns busy: - OSPM try to offline an individual device, but the device offline function returns "busy". - When the ejection event is applied to an "not offlined yet" container. OSPM sends a kobject change event to userspace and returns "busy". Both of them will returns -EBUSY to ACPI device hotplug function. Then, the hotplug function indicates non-specific failure to platform just like for any other error, e.g. -ENODEV or -EIO. The benefit to the platform for identifying the OS "busy" state is that it can use a different approach to handle the "busy" instead of simply terminating the hot-remove operation for an unknown reason. For example, the platform can wait for a while and then re-trigger hot-remove. Signed-off-by: "Lee, Chun-Yi" <jlee@suse.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> [ rjw: Changelog massage ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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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.