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Use proc->outer_lock to protect the binder_ref structure. The outer lock allows functions operating on the binder_ref to do nested acquires of node and inner locks as necessary to attach refs to nodes atomically. Binder refs must never be accesssed without holding the outer lock. Signed-off-by: Todd Kjos <tkjos@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>