mptcp: use MPTCP_SUBFLOW_NODATA

Set subflow->data_avail with the enum value MPTCP_SUBFLOW_NODATA, instead
of using 0 directly.

Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 45c004f87f5aa461cb121b3bbb9d0b05e274fdbf..bb09a008e733b6b6de3c6c7a22f3177b06ee8536 100644 (file)
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -1104,7 +1104,7 @@ static bool subflow_check_data_avail(struct sock *ssk)
        struct sk_buff *skb;
 
        if (!skb_peek(&ssk->sk_receive_queue))
-               WRITE_ONCE(subflow->data_avail, 0);
+               WRITE_ONCE(subflow->data_avail, MPTCP_SUBFLOW_NODATA);
        if (subflow->data_avail)
                return true;
 
@@ -1169,7 +1169,7 @@ fallback:
                subflow->reset_transient = 0;
                subflow->reset_reason = MPTCP_RST_EMIDDLEBOX;
                tcp_send_active_reset(ssk, GFP_ATOMIC);
-               WRITE_ONCE(subflow->data_avail, 0);
+               WRITE_ONCE(subflow->data_avail, MPTCP_SUBFLOW_NODATA);
                return true;
        }
 
@@ -1182,7 +1182,7 @@ fallback:
                subflow->reset_transient = 0;
                subflow->reset_reason = MPTCP_RST_EMPTCP;
                tcp_send_active_reset(ssk, GFP_ATOMIC);
-               WRITE_ONCE(subflow->data_avail, 0);
+               WRITE_ONCE(subflow->data_avail, MPTCP_SUBFLOW_NODATA);
                return false;
        }
 
@@ -1204,7 +1204,7 @@ bool mptcp_subflow_data_available(struct sock *sk)
        if (subflow->map_valid &&
            mptcp_subflow_get_map_offset(subflow) >= subflow->map_data_len) {
                subflow->map_valid = 0;
-               WRITE_ONCE(subflow->data_avail, 0);
+               WRITE_ONCE(subflow->data_avail, MPTCP_SUBFLOW_NODATA);
 
                pr_debug("Done with mapping: seq=%u data_len=%u",
                         subflow->map_subflow_seq,