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When devices are added, the bus might want to create device links to track functional dependencies between supplier and consumer devices. This tracking of supplier-consumer relationship allows optimizing device probe order and tracking whether all consumers of a supplier are active. The add_links bus callback is added to support this. However, when consumer devices are added, they might not have a supplier device to link to despite needing mandatory resources/functionality from one or more suppliers. A waiting_for_suppliers list is created to track such consumers and retry linking them when new devices get added. Signed-off-by: Saravana Kannan <saravanak@google.com> Link: https://lore.kernel.org/r/20190731221721.187713-2-saravanak@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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