XPRT_SOCK_DATA_READY
clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))