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>

2 files changed, 23 insertions, 20 deletions

diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index 86354e06eb48..f9c659b3f3a9 100644
--- a/net/batman-adv/main.h
+++ b/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)
 
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index bc518fca0b69..a84e80409f9b 100644
--- a/net/batman-adv/translation-table.c
+++ b/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))
@@ -420,8 +412,8 @@ 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,
-                                            TT_LOCAL_TIMEOUT * 1000))
+                        if (!has_timed_out(tt_local_entry->last_seen,
+                                           TT_LOCAL_TIMEOUT * 1000))
                                 continue;
 
                         tt_local_set_pending(bat_priv, tt_local_entry,
@@ -758,8 +750,8 @@ 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,
-                                            TT_CLIENT_ROAM_TIMEOUT * 1000))
+                        if (!has_timed_out(tt_global_entry->roam_at,
+                                           TT_CLIENT_ROAM_TIMEOUT * 1000))
                                 continue;
 
                         bat_dbg(DBG_TT, bat_priv, "Deleting global "
@@ -978,8 +970,8 @@ 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,
-                    TT_REQUEST_TIMEOUT * 1000)) {
+                if (has_timed_out(node->issued_at,
+                                  TT_REQUEST_TIMEOUT * 1000)) {
                         list_del(&node->list);
                         kfree(node);
                 }
@@ -997,8 +989,8 @@ 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,
-                                    TT_REQUEST_TIMEOUT * 1000))
+                    !has_timed_out(tt_req_node_tmp->issued_at,
+                                   TT_REQUEST_TIMEOUT * 1000))
                         goto unlock;
         }
 
@@ -1591,8 +1583,8 @@ 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,
-                                    ROAMING_MAX_TIME * 1000))
+                if (!has_timed_out(node->first_time,
+                                   ROAMING_MAX_TIME * 1000))
                         continue;
 
                 list_del(&node->list);
@@ -1619,8 +1611,8 @@ 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,
-                                   ROAMING_MAX_TIME * 1000))
+                if (has_timed_out(tt_roam_node->first_time,
+                                  ROAMING_MAX_TIME * 1000))
                         continue;
 
                 if (!atomic_dec_not_zero(&tt_roam_node->counter))