SK_F_CONNECT_START
if (test_and_set_bit(SK_F_CONNECT_START, &csk->flags))
clear_bit(SK_F_CONNECT_START, &csk->flags);
test_bit(SK_F_CONNECT_START, &csk->flags)) {
clear_bit(SK_F_CONNECT_START, &csk->flags);
clear_bit(SK_F_CONNECT_START, &csk->flags);
if (!test_bit(SK_F_CONNECT_START, &csk->flags)) {
clear_bit(SK_F_CONNECT_START, &csk->flags);
clear_bit(SK_F_CONNECT_START, &csk->flags);