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authorSven Eckelmann <sven@narfation.org>2016-01-16 10:29:48 +0100
committerAntonio Quartulli <a@unstable.cc>2016-02-10 23:24:02 +0800
commitf7157dd135012d9e9b4d74a9f8b2426ea92131f8 (patch)
tree2111d3ae1f4de5d38aef0dbaf22c1d7862f61299 /net/batman-adv
parent68a6722cc41f92ceffa8915bfe6a9c0307f2abeb (diff)
downloadop-kernel-dev-f7157dd135012d9e9b4d74a9f8b2426ea92131f8.zip
op-kernel-dev-f7157dd135012d9e9b4d74a9f8b2426ea92131f8.tar.gz
batman-adv: Convert batadv_tvlv_container to kref
batman-adv uses a self-written reference implementation which is just based on atomic_t. This is less obvious when reading the code than kref and therefore increases the change that the reference counting will be missed. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <a@unstable.cc>
Diffstat (limited to 'net/batman-adv')
-rw-r--r--net/batman-adv/main.c22
-rw-r--r--net/batman-adv/types.h2
2 files changed, 18 insertions, 6 deletions
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index a9b4f75..4b6c258 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -29,6 +29,7 @@
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/kernel.h>
+#include <linux/kref.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/module.h>
@@ -670,14 +671,25 @@ static struct batadv_tvlv_handler
}
/**
+ * batadv_tvlv_container_release - release tvlv from lists and free
+ * @ref: kref pointer of the tvlv
+ */
+static void batadv_tvlv_container_release(struct kref *ref)
+{
+ struct batadv_tvlv_container *tvlv;
+
+ tvlv = container_of(ref, struct batadv_tvlv_container, refcount);
+ kfree(tvlv);
+}
+
+/**
* batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and
- * possibly free it
+ * possibly release it
* @tvlv: the tvlv container to free
*/
static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv)
{
- if (atomic_dec_and_test(&tvlv->refcount))
- kfree(tvlv);
+ kref_put(&tvlv->refcount, batadv_tvlv_container_release);
}
/**
@@ -706,7 +718,7 @@ static struct batadv_tvlv_container
if (tvlv_tmp->tvlv_hdr.version != version)
continue;
- if (!atomic_inc_not_zero(&tvlv_tmp->refcount))
+ if (!kref_get_unless_zero(&tvlv_tmp->refcount))
continue;
tvlv = tvlv_tmp;
@@ -814,7 +826,7 @@ void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len));
INIT_HLIST_NODE(&tvlv_new->list);
- atomic_set(&tvlv_new->refcount, 1);
+ kref_init(&tvlv_new->refcount);
spin_lock_bh(&bat_priv->tvlv.container_list_lock);
tvlv_old = batadv_tvlv_container_get(bat_priv, type, version);
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 9df8f39..c55925b 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -1266,7 +1266,7 @@ struct batadv_dat_candidate {
struct batadv_tvlv_container {
struct hlist_node list;
struct batadv_tvlv_hdr tvlv_hdr;
- atomic_t refcount;
+ struct kref refcount;
};
/**
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