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batman-adv: Convert batadv_neigh_node 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>
This commit is contained in:
Sven Eckelmann 2016-01-16 10:29:53 +01:00 committed by Antonio Quartulli
parent a6ba0d340d
commit 77ae32e898
4 changed files with 20 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
net/batman-adv/bat_iv_ogm.c
View File

@ -31,6 +31,7 @@
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/list.h>
#include <linux/kref.h>
#include <linux/netdevice.h>
#include <linux/pkt_sched.h>
#include <linux/printk.h>
@ -1002,7 +1003,7 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
neigh_addr = tmp_neigh_node->addr;
if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
tmp_neigh_node->if_incoming == if_incoming &&
atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
kref_get_unless_zero(&tmp_neigh_node->refcount)) {
if (WARN(neigh_node, "too many matching neigh_nodes"))
batadv_neigh_node_free_ref(neigh_node);
neigh_node = tmp_neigh_node;
@ -1161,7 +1162,7 @@ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
if (tmp_neigh_node->if_incoming != if_incoming)
continue;
if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
continue;
neigh_node = tmp_neigh_node;

22
net/batman-adv/originator.c
View File

@ -229,15 +229,17 @@ void batadv_hardif_neigh_free_ref(struct batadv_hardif_neigh_node *hardif_neigh)
/**
* batadv_neigh_node_release - release neigh_node from lists and queue for
* free after rcu grace period
* @neigh_node: neigh neighbor to free
* @ref: kref pointer of the neigh_node
*/
static void batadv_neigh_node_release(struct batadv_neigh_node *neigh_node)
static void batadv_neigh_node_release(struct kref *ref)
{
struct hlist_node *node_tmp;
struct batadv_neigh_node *neigh_node;
struct batadv_hardif_neigh_node *hardif_neigh;
struct batadv_neigh_ifinfo *neigh_ifinfo;
struct batadv_algo_ops *bao;
neigh_node = container_of(ref, struct batadv_neigh_node, refcount);
bao = neigh_node->orig_node->bat_priv->bat_algo_ops;
hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
@ -262,14 +264,13 @@ static void batadv_neigh_node_release(struct batadv_neigh_node *neigh_node)
}
/**
* batadv_neigh_node_free_ref - decrement the neighbors refcounter
* and possibly release it
* batadv_neigh_node_free_ref - decrement the neighbors refcounter and possibly
* release it
* @neigh_node: neigh neighbor to free
*/
void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
{
if (atomic_dec_and_test(&neigh_node->refcount))
batadv_neigh_node_release(neigh_node);
kref_put(&neigh_node->refcount, batadv_neigh_node_release);
}
/**
@ -298,7 +299,7 @@ batadv_orig_router_get(struct batadv_orig_node *orig_node,
break;
}
if (router && !atomic_inc_not_zero(&router->refcount))
if (router && !kref_get_unless_zero(&router->refcount))
router = NULL;
rcu_read_unlock();
@ -491,7 +492,7 @@ batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
if (tmp_neigh_node->if_incoming != hard_iface)
continue;
if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
continue;
res = tmp_neigh_node;
@ -649,7 +650,8 @@ batadv_neigh_node_new(struct batadv_orig_node *orig_node,
neigh_node->orig_node = orig_node;
/* extra reference for return */
atomic_set(&neigh_node->refcount, 2);
kref_init(&neigh_node->refcount);
kref_get(&neigh_node->refcount);
spin_lock_bh(&orig_node->neigh_list_lock);
hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
@ -1084,7 +1086,7 @@ batadv_find_best_neighbor(struct batadv_priv *bat_priv,
best, if_outgoing) <= 0))
continue;
if (!atomic_inc_not_zero(&neigh->refcount))
if (!kref_get_unless_zero(&neigh->refcount))
continue;
if (best)

8
net/batman-adv/routing.c
View File

@ -73,7 +73,7 @@ static void _batadv_update_route(struct batadv_priv *bat_priv,
rcu_read_lock();
curr_router = rcu_dereference(orig_ifinfo->router);
if (curr_router && !atomic_inc_not_zero(&curr_router->refcount))
if (curr_router && !kref_get_unless_zero(&curr_router->refcount))
curr_router = NULL;
rcu_read_unlock();
@ -101,7 +101,7 @@ static void _batadv_update_route(struct batadv_priv *bat_priv,
batadv_neigh_node_free_ref(curr_router);
/* increase refcount of new best neighbor */
if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
if (neigh_node && !kref_get_unless_zero(&neigh_node->refcount))
neigh_node = NULL;
spin_lock_bh(&orig_node->neigh_list_lock);
@ -505,7 +505,7 @@ batadv_find_router(struct batadv_priv *bat_priv,
if (!cand_router)
goto next;
if (!atomic_inc_not_zero(&cand_router->refcount)) {
if (!kref_get_unless_zero(&cand_router->refcount)) {
cand_router = NULL;
goto next;
}
@ -524,7 +524,7 @@ batadv_find_router(struct batadv_priv *bat_priv,
/* mark the first possible candidate */
if (!first_candidate) {
atomic_inc(&cand_router->refcount);
kref_get(&cand_router->refcount);
kref_get(&cand->refcount);
first_candidate = cand;
first_candidate_router = cand_router;

2
net/batman-adv/types.h
View File

@ -384,7 +384,7 @@ struct batadv_neigh_node {
spinlock_t ifinfo_lock; /* protects ifinfo_list and its members */
struct batadv_hard_iface *if_incoming;
unsigned long last_seen;
atomic_t refcount;
struct kref refcount;
struct rcu_head rcu;
};