net: Remove check for k_delayed_work_cancel

k_delayed_work_cancel now only fail if it hasn't been submitted which
means it is not in use anyway so it safe to reset its data regardless
of its return.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

include/net/http.h

@@ -785,9 +785,6 @@ struct http_server_ctx {
 
 		/** URL's length */
 		u16_t url_len;
-
-		/** Has the request timer been cancelled. */
-		u8_t timer_cancelled;
 	} req;
 
 #if defined(CONFIG_HTTPS)

include/net/net_app.h

@@ -300,11 +300,6 @@ struct net_app_ctx {
 		/** DTLS final timer. Connection is terminated if this expires.
 		 */
 		struct k_delayed_work fin_timer;
-
-		/** Timer flag telling whether the dtls timer has been
-		 * cancelled or not.
-		 */
-		bool fin_timer_cancelled;
 	} dtls;
 #endif
 

subsys/net/ip/ipv6.c

@@ -222,12 +222,7 @@ struct net_ipv6_nbr_data *net_ipv6_get_nbr_by_index(u8_t idx)
 
 static inline void nbr_clear_ns_pending(struct net_ipv6_nbr_data *data)
 {
-	int ret;
-
-	ret = k_delayed_work_cancel(&data->send_ns);
-	if (ret < 0) {
-		NET_DBG("Cannot cancel NS work (%d)", ret);
-	}
+	k_delayed_work_cancel(&data->send_ns);
 
 	if (data->pending) {
 		net_pkt_unref(data->pending);

subsys/net/ip/net_context.c

@@ -100,7 +100,6 @@ static struct tcp_backlog_entry {
 	u32_t send_seq;
 	u32_t send_ack;
 	struct k_delayed_work ack_timer;
-	bool cancelled;
 } tcp_backlog[CONFIG_NET_TCP_BACKLOG_SIZE];
 
 static void backlog_ack_timeout(struct k_work *work)
@@ -108,11 +107,9 @@ static void backlog_ack_timeout(struct k_work *work)
 	struct tcp_backlog_entry *backlog =
 		CONTAINER_OF(work, struct tcp_backlog_entry, ack_timer);
 
-	if (!backlog->cancelled) {
-		NET_DBG("Did not receive ACK in %dms", ACK_TIMEOUT);
+	NET_DBG("Did not receive ACK in %dms", ACK_TIMEOUT);
 
-		send_reset(backlog->tcp->context, &backlog->remote);
-	}
+	send_reset(backlog->tcp->context, &backlog->remote);
 
 	memset(backlog, 0, sizeof(struct tcp_backlog_entry));
 }
@@ -265,17 +262,8 @@ static int tcp_backlog_ack(struct net_pkt *pkt, struct net_context *context)
 	context->tcp->send_seq = tcp_backlog[r].send_seq;
 	context->tcp->send_ack = tcp_backlog[r].send_ack;
 
-	if (k_delayed_work_cancel(&tcp_backlog[r].ack_timer) < 0) {
-		/* Too late to cancel - just set flag for worker.
-		 * TODO: Note that in this case, we can be preempted
-		 * anytime (could have been preempted even before we did
-		 * the check), so access to tcp_backlog should be synchronized
-		 * between this function and worker.
-		 */
-		tcp_backlog[r].cancelled = true;
-	} else {
-		memset(&tcp_backlog[r], 0, sizeof(struct tcp_backlog_entry));
-	}
+	k_delayed_work_cancel(&tcp_backlog[r].ack_timer);
+	memset(&tcp_backlog[r], 0, sizeof(struct tcp_backlog_entry));
 
 	return 0;
 }
@@ -300,17 +288,8 @@ static int tcp_backlog_rst(struct net_pkt *pkt)
 		return -EINVAL;
 	}
 
-	if (k_delayed_work_cancel(&tcp_backlog[r].ack_timer) < 0) {
-		/* Too late to cancel - just set flag for worker.
-		 * TODO: Note that in this case, we can be preempted
-		 * anytime (could have been preempted even before we did
-		 * the check), so access to tcp_backlog should be synchronized
-		 * between this function and worker.
-		 */
-		tcp_backlog[r].cancelled = true;
-	} else {
-		memset(&tcp_backlog[r], 0, sizeof(struct tcp_backlog_entry));
-	}
+	k_delayed_work_cancel(&tcp_backlog[r].ack_timer);
+	memset(&tcp_backlog[r], 0, sizeof(struct tcp_backlog_entry));
 
 	return 0;
 }
@@ -320,11 +299,9 @@ static void handle_fin_timeout(struct k_work *work)
 	struct net_tcp *tcp =
 		CONTAINER_OF(work, struct net_tcp, fin_timer);
 
-	if (!tcp->fin_timer_cancelled) {
-		NET_DBG("Did not receive FIN in %dms", FIN_TIMEOUT);
+	NET_DBG("Did not receive FIN in %dms", FIN_TIMEOUT);
 
-		net_context_unref(tcp->context);
-	}
+	net_context_unref(tcp->context);
 }
 
 static void handle_ack_timeout(struct k_work *work)
@@ -332,10 +309,6 @@ static void handle_ack_timeout(struct k_work *work)
 	/* This means that we did not receive ACK response in time. */
 	struct net_tcp *tcp = CONTAINER_OF(work, struct net_tcp, ack_timer);
 
-	if (tcp->ack_timer_cancelled) {
-		return;
-	}
-
 	NET_DBG("Did not receive ACK in %dms while in %s", ACK_TIMEOUT,
 		net_tcp_state_str(net_tcp_get_state(tcp)));
 
@@ -641,13 +614,8 @@ int net_context_unref(struct net_context *context)
 				continue;
 			}
 
-			if (k_delayed_work_cancel(&tcp_backlog[i].ack_timer) ==
-							    -EINPROGRESS) {
-				tcp_backlog[i].cancelled = true;
-			} else {
-				memset(&tcp_backlog[i], 0,
-				       sizeof(struct tcp_backlog_entry));
-			}
+			k_delayed_work_cancel(&tcp_backlog[i].ack_timer);
+			memset(&tcp_backlog[i], 0, sizeof(tcp_backlog[i]));
 		}
 
 		net_tcp_release(context->tcp);
@@ -701,7 +669,6 @@ int net_context_put(struct net_context *context)
 				"disposing yet (waiting %dms)", FIN_TIMEOUT);
 			k_delayed_work_submit(&context->tcp->fin_timer,
 					      FIN_TIMEOUT);
-			context->tcp->fin_timer_cancelled = false;
 			queue_fin(context);
 			return 0;
 		}
@@ -1247,7 +1214,6 @@ NET_CONN_CB(tcp_established)
 		 * would be stuck forever.
 		 */
 		k_delayed_work_submit(&context->tcp->ack_timer, ACK_TIMEOUT);
-		context->tcp->ack_timer_cancelled = false;
 	}
 
 	send_ack(context, &conn->remote_addr, false);

subsys/net/ip/tcp.c

@@ -248,13 +248,11 @@ struct net_tcp *net_tcp_alloc(struct net_context *context)
 
 static void ack_timer_cancel(struct net_tcp *tcp)
 {
-	tcp->ack_timer_cancelled = true;
 	k_delayed_work_cancel(&tcp->ack_timer);
 }
 
 static void fin_timer_cancel(struct net_tcp *tcp)
 {
-	tcp->fin_timer_cancelled = true;
 	k_delayed_work_cancel(&tcp->fin_timer);
 }
 

subsys/net/ip/tcp.h

@@ -135,15 +135,8 @@ struct net_tcp {
 	u32_t fin_sent : 1;
 	/* An inbound FIN packet has been received */
 	u32_t fin_rcvd : 1;
-	/* Tells if ack timer has been already cancelled. It might happen
-	 * that the timer is executed even if it is cancelled, this is because
-	 * of various timing issues when timer is scheduled to run.
-	 */
-	u32_t ack_timer_cancelled : 1;
-	/* Tells if fin timer has been already cancelled. */
-	u32_t fin_timer_cancelled : 1;
 	/** Remaining bits in this u32_t */
-	u32_t _padding : 11;
+	u32_t _padding : 13;
 
 	/** Accept callback to be called when the connection has been
 	 * established.

subsys/net/lib/app/net_app.c

@@ -1041,8 +1041,6 @@ static int dtls_timing_get_delay(void *data)
 
 static void dtls_cleanup(struct net_app_ctx *ctx, bool cancel_timer)
 {
-	ctx->dtls.fin_timer_cancelled = true;
-
 	if (cancel_timer) {
 		k_delayed_work_cancel(&ctx->dtls.fin_timer);
 	}
@@ -1060,11 +1058,9 @@ static void dtls_timeout(struct k_work *work)
 	struct net_app_ctx *ctx =
 		CONTAINER_OF(work, struct net_app_ctx, dtls.fin_timer);
 
-	if (!ctx->dtls.fin_timer_cancelled) {
-		NET_DBG("Did not receive DTLS traffic in %dms", DTLS_TIMEOUT);
+	NET_DBG("Did not receive DTLS traffic in %dms", DTLS_TIMEOUT);
 
-		dtls_cleanup(ctx, false);
-	}
+	dtls_cleanup(ctx, false);
 }
 
 enum net_verdict _net_app_dtls_established(struct net_conn *conn,
@@ -1117,12 +1113,10 @@ enum net_verdict _net_app_dtls_established(struct net_conn *conn,
 
 	k_fifo_put(&ctx->tls.mbedtls.ssl_ctx.tx_rx_fifo, (void *)rx_data);
 
-	ctx->dtls.fin_timer_cancelled = true;
 	k_delayed_work_cancel(&ctx->dtls.fin_timer);
 
 	k_yield();
 
-	ctx->dtls.fin_timer_cancelled = false;
 	k_delayed_work_submit(&ctx->dtls.fin_timer, DTLS_TIMEOUT);
 
 	return NET_OK;
@@ -1226,7 +1220,6 @@ static int accept_dtls(struct net_app_ctx *ctx,
 
 	ctx->dtls.ctx = dtls_context;
 
-	ctx->dtls.fin_timer_cancelled = false;
 	k_delayed_work_submit(&ctx->dtls.fin_timer, DTLS_TIMEOUT);
 
 	return 0;
@@ -1279,17 +1272,6 @@ void _net_app_tls_received(struct net_context *context,
 			net_pkt_unref(pkt);
 			return;
 		} else {
-			if (ctx->dtls.fin_timer_cancelled) {
-				if (pkt) {
-					net_pkt_unref(pkt);
-					pkt = NULL;
-				}
-
-				ctx->dtls.fin_timer_cancelled = false;
-
-				goto dtls_disconnect;
-			}
-
 			ret = accept_dtls(ctx, context, pkt);
 			if (ret < 0) {
 				NET_DBG("Cannot accept new DTLS "

subsys/net/lib/http/http_server.c

@@ -152,7 +152,6 @@ static int http_add_chunk(struct net_pkt *pkt, s32_t timeout, const char *str)
 
 static void req_timer_cancel(struct http_server_ctx *ctx)
 {
-	ctx->req.timer_cancelled = true;
 	k_delayed_work_cancel(&ctx->req.timer);
 
 	NET_DBG("Context %p request timer cancelled", ctx);
@@ -164,10 +163,6 @@ static void req_timeout(struct k_work *work)
 						   struct http_server_ctx,
 						   req.timer);
 
-	if (ctx->req.timer_cancelled) {
-		return;
-	}
-
 	NET_DBG("Context %p request timeout", ctx);
 
 	net_context_put(ctx->req.net_ctx);
@@ -194,8 +189,6 @@ static void pkt_sent(struct net_context *context,
 		NET_DBG("Context %p starting timer", ctx);
 
 		k_delayed_work_submit(&ctx->req.timer, timeout);
-
-		ctx->req.timer_cancelled = false;
 	}
 
 	/* Note that if the timeout is K_FOREVER, we do not close