[15/23] batman-adv: Convert batadv_orig_node_free_rcu to kref
Commit Message
So switch to kref instead of using the self-made, atomic_t-based
implementation.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
net/batman-adv/originator.c | 11 --------
net/batman-adv/originator.h | 1 -
net/batman-adv/translation-table.c | 54 +++++++++++++++++++++-----------------
net/batman-adv/types.h | 2 +-
4 files changed, 31 insertions(+), 37 deletions(-)
@@ -819,17 +819,6 @@ void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
}
-/**
- * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
- * possibly free it (without rcu callback)
- * @orig_node: the orig node to free
- */
-void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
-{
- if (atomic_dec_and_test(&orig_node->refcount))
- batadv_orig_node_free_rcu(&orig_node->rcu);
-}
-
void batadv_originator_free(struct batadv_priv *bat_priv)
{
struct batadv_hashtable *hash = bat_priv->orig_hash;
@@ -38,7 +38,6 @@ int batadv_originator_init(struct batadv_priv *bat_priv);
void batadv_originator_free(struct batadv_priv *bat_priv);
void batadv_purge_orig_ref(struct batadv_priv *bat_priv);
void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node);
-void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node);
struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
const u8 *addr);
struct batadv_hardif_neigh_node *
@@ -31,6 +31,7 @@
#include <linux/jhash.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
+#include <linux/kref.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/netdevice.h>
@@ -248,20 +249,6 @@ int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
return count;
}
-static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
-{
- struct batadv_tt_orig_list_entry *orig_entry;
-
- orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
-
- /* We are in an rcu callback here, therefore we cannot use
- * batadv_orig_node_free_ref() and its call_rcu():
- * An rcu_barrier() wouldn't wait for that to finish
- */
- batadv_orig_node_free_ref_now(orig_entry->orig_node);
- kfree(orig_entry);
-}
-
/**
* batadv_tt_local_size_mod - change the size by v of the local table identified
* by vid
@@ -357,13 +344,31 @@ static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
batadv_tt_global_size_mod(orig_node, vid, -1);
}
-static void
-batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
+/**
+ * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
+ * queue for free after rcu grace period
+ * * @ref: kref pointer of the tt orig entry
+ */
+static void batadv_tt_orig_list_entry_release(struct kref *ref)
{
- if (!atomic_dec_and_test(&orig_entry->refcount))
- return;
+ struct batadv_tt_orig_list_entry *orig_entry;
- call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
+ orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
+ refcount);
+
+ batadv_orig_node_free_ref(orig_entry->orig_node);
+ kfree_rcu(orig_entry, rcu);
+}
+
+/**
+ * batadv_tt_orig_list_entry_put - decrement the tt orig entry refcounter and
+ * possibly release it
+ * @orig_entry: tt orig entry to be free'd
+ */
+static void
+batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry)
+{
+ kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
}
/**
@@ -1272,7 +1277,7 @@ batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
if (tmp_orig_entry->orig_node != orig_node)
continue;
- if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
+ if (!kref_get_unless_zero(&tmp_orig_entry->refcount))
continue;
orig_entry = tmp_orig_entry;
@@ -1303,7 +1308,7 @@ batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
if (orig_entry) {
found = true;
- batadv_tt_orig_list_entry_free_ref(orig_entry);
+ batadv_tt_orig_list_entry_put(orig_entry);
}
return found;
@@ -1333,7 +1338,8 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
orig_entry->orig_node = orig_node;
orig_entry->ttvn = ttvn;
- atomic_set(&orig_entry->refcount, 2);
+ kref_init(&orig_entry->refcount);
+ kref_get(&orig_entry->refcount);
spin_lock_bh(&tt_global->list_lock);
hlist_add_head_rcu(&orig_entry->list,
@@ -1343,7 +1349,7 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
out:
if (orig_entry)
- batadv_tt_orig_list_entry_free_ref(orig_entry);
+ batadv_tt_orig_list_entry_put(orig_entry);
}
/**
@@ -1709,7 +1715,7 @@ _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
* being part of a list
*/
hlist_del_rcu(&orig_entry->list);
- batadv_tt_orig_list_entry_free_ref(orig_entry);
+ batadv_tt_orig_list_entry_put(orig_entry);
}
/* deletes the orig list of a tt_global_entry */
@@ -1014,7 +1014,7 @@ struct batadv_tt_orig_list_entry {
struct batadv_orig_node *orig_node;
u8 ttvn;
struct hlist_node list;
- atomic_t refcount;
+ struct kref refcount;
struct rcu_head rcu;
};