inet_diag: use jiffies_delta_to_msecs()

Use jiffies_delta_to_msecs() to avoid reporting 'infinite'
timeouts and to cleanup code.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/inet_diag.c

@@ -226,17 +226,17 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 		r->idiag_timer = 1;
 		r->idiag_retrans = icsk->icsk_retransmits;
 		r->idiag_expires =
-			jiffies_to_msecs(icsk->icsk_timeout - jiffies);
+			jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
 	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 		r->idiag_timer = 4;
 		r->idiag_retrans = icsk->icsk_probes_out;
 		r->idiag_expires =
-			jiffies_to_msecs(icsk->icsk_timeout - jiffies);
+			jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
 	} else if (timer_pending(&sk->sk_timer)) {
 		r->idiag_timer = 2;
 		r->idiag_retrans = icsk->icsk_probes_out;
 		r->idiag_expires =
-			jiffies_to_msecs(sk->sk_timer.expires - jiffies);
+			jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies);
 	} else {
 		r->idiag_timer = 0;
 		r->idiag_expires = 0;
@@ -342,16 +342,13 @@ static int inet_twsk_diag_fill(struct sock *sk,
 	r = nlmsg_data(nlh);
 	BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 
-	tmo = tw->tw_timer.expires - jiffies;
-	if (tmo < 0)
-		tmo = 0;
-
 	inet_diag_msg_common_fill(r, sk);
 	r->idiag_retrans      = 0;
 
 	r->idiag_state	      = tw->tw_substate;
 	r->idiag_timer	      = 3;
-	r->idiag_expires      = jiffies_to_msecs(tmo);
+	tmo = tw->tw_timer.expires - jiffies;
+	r->idiag_expires      = jiffies_delta_to_msecs(tmo);
 	r->idiag_rqueue	      = 0;
 	r->idiag_wqueue	      = 0;
 	r->idiag_uid	      = 0;
@@ -385,7 +382,7 @@ static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 		     offsetof(struct sock, sk_cookie));
 
 	tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
-	r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
+	r->idiag_expires = jiffies_delta_to_msecs(tmo);
 	r->idiag_rqueue	= 0;
 	r->idiag_wqueue	= 0;
 	r->idiag_uid	= 0;