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  • Johan Hovold's avatar
    of: add helper to lookup compatible child node · 36156f92
    Johan Hovold authored
    Add of_get_compatible_child() helper that can be used to lookup
    compatible child nodes.
    Several drivers currently use of_find_compatible_node() to lookup child
    nodes while failing to notice that the of_find_ functions search the
    entire tree depth-first (from a given start node) and therefore can
    match unrelated nodes. The fact that these functions also drop a
    reference to the node they start searching from (e.g. the parent node)
    is typically also overlooked, something which can lead to use-after-free
    Signed-off-by: default avatarJohan Hovold <>
    Signed-off-by: default avatarRob Herring <>