sctp_wspace
if (sctp_wspace(asoc) < (int)msg_len)
sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
if (sctp_wspace(asoc) <= 0)
if ((int)msg_len <= sctp_wspace(asoc) &&