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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-12-29 15:25:35 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-12-29 15:25:35 +0100
commitd22ddcbc4fb7a483d0721eddfda3f0558821d372 (patch)
tree9f3623f9faac8a7d4e1aac59e51123187fb94925 /include/linux
parentbfecc2b3e34c6751343bacd317c4dfd1d695142c (diff)
ACPI / hotplug: Add demand_offline hotplug profile flag
Add a new ACPI hotplug profile flag, demand_offline, such that if set for the given ACPI device object's scan handler, it will cause acpi_scan_hot_remove() to check if that device object's physical companions are offline upfront and fail the hot removal if that is not the case. That flag will be useful to overcome a problem with containers on some system where they can only be hot-removed after some cleanup operations carried out by user space, which needs to be notified of the container hot-removal before the kernel attempts to offline devices in the container. In those cases the current implementation of acpi_scan_hot_remove() is not sufficient, because it first tries to offline the devices in the container and only if that is suffcessful it tries to offline the container itself. As a result, the container hot-removal notification is not delivered to user space at the right time. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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