batman-adv: Move is_out_of_time() to main.h for general use

Both translation tables and network coding use timeouts to do house
keeping, so we might as well share the function used to compare a
timestamp+timeout with current time.

For readability and simplicity, the function is renamed to
has_timed_out() and uses time_is_before_jiffies() instead of
time_after().
Signed-off-by: Martin Hundebøll <martin@hundeboll.net>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>

net/batman-adv/main.h

@@ -202,6 +202,17 @@ static inline int compare_eth(const void *data1, const void *data2)
 	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 }
 
+/**
+ * has_timed_out - compares current time (jiffies) and timestamp + timeout
+ * @timestamp:		base value to compare with (in jiffies)
+ * @timeout:		added to base value before comparing (in milliseconds)
+ *
+ * Returns true if current time is after timestamp + timeout
+ */
+static inline bool has_timed_out(unsigned long timestamp, unsigned int timeout)
+{
+	return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout));
+}
 
 #define atomic_dec_not_zero(v)	atomic_add_unless((v), -1, 0)
 

net/batman-adv/translation-table.c

@@ -108,14 +108,6 @@ static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
 
 }
 
-static bool is_out_of_time(unsigned long starting_time, unsigned long timeout)
-{
-	unsigned long deadline;
-	deadline = starting_time + msecs_to_jiffies(timeout);
-
-	return time_after(jiffies, deadline);
-}
-
 static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
 {
 	if (atomic_dec_and_test(&tt_local_entry->common.refcount))
@@ -420,7 +412,7 @@ static void tt_local_purge(struct bat_priv *bat_priv)
 			if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
 				continue;
 
-			if (!is_out_of_time(tt_local_entry->last_seen,
+			if (!has_timed_out(tt_local_entry->last_seen,
 					   TT_LOCAL_TIMEOUT * 1000))
 				continue;
 
@@ -758,7 +750,7 @@ static void tt_global_roam_purge(struct bat_priv *bat_priv)
 						       common);
 			if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM))
 				continue;
-			if (!is_out_of_time(tt_global_entry->roam_at,
+			if (!has_timed_out(tt_global_entry->roam_at,
 					   TT_CLIENT_ROAM_TIMEOUT * 1000))
 				continue;
 
@@ -978,7 +970,7 @@ static void tt_req_purge(struct bat_priv *bat_priv)
 
 	spin_lock_bh(&bat_priv->tt_req_list_lock);
 	list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
-		if (is_out_of_time(node->issued_at,
+		if (has_timed_out(node->issued_at,
 				  TT_REQUEST_TIMEOUT * 1000)) {
 			list_del(&node->list);
 			kfree(node);
@@ -997,7 +989,7 @@ static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
 	spin_lock_bh(&bat_priv->tt_req_list_lock);
 	list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
 		if (compare_eth(tt_req_node_tmp, orig_node) &&
-		    !is_out_of_time(tt_req_node_tmp->issued_at,
+		    !has_timed_out(tt_req_node_tmp->issued_at,
 				   TT_REQUEST_TIMEOUT * 1000))
 			goto unlock;
 	}
@@ -1591,7 +1583,7 @@ static void tt_roam_purge(struct bat_priv *bat_priv)
 
 	spin_lock_bh(&bat_priv->tt_roam_list_lock);
 	list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
-		if (!is_out_of_time(node->first_time,
+		if (!has_timed_out(node->first_time,
 				   ROAMING_MAX_TIME * 1000))
 			continue;
 
@@ -1619,7 +1611,7 @@ static bool tt_check_roam_count(struct bat_priv *bat_priv,
 		if (!compare_eth(tt_roam_node->addr, client))
 			continue;
 
-		if (is_out_of_time(tt_roam_node->first_time,
+		if (has_timed_out(tt_roam_node->first_time,
 				  ROAMING_MAX_TIME * 1000))
 			continue;