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batman-adv: Convert batadv_orig_ifinfo to kref

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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 10:29:52 +01:00 committed by Antonio Quartulli
parent 962c68328b
commit a6ba0d340d
3 changed files with 13 additions and 9 deletions
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15
net/batman-adv/originator.c
View File

@ -326,7 +326,7 @@ batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
if (tmp->if_outgoing != if_outgoing)
continue;
if (!atomic_inc_not_zero(&tmp->refcount))
if (!kref_get_unless_zero(&tmp->refcount))
continue;
orig_ifinfo = tmp;
@ -377,7 +377,8 @@ batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
orig_ifinfo->batman_seqno_reset = reset_time;
orig_ifinfo->if_outgoing = if_outgoing;
INIT_HLIST_NODE(&orig_ifinfo->list);
atomic_set(&orig_ifinfo->refcount, 2);
kref_init(&orig_ifinfo->refcount);
kref_get(&orig_ifinfo->refcount);
hlist_add_head_rcu(&orig_ifinfo->list,
&orig_node->ifinfo_list);
out:
@ -704,12 +705,15 @@ int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset)
/**
* batadv_orig_ifinfo_release - release orig_ifinfo from lists and queue for
* free after rcu grace period
* @orig_ifinfo: the orig_ifinfo object to release
* @ref: kref pointer of the orig_ifinfo
*/
static void batadv_orig_ifinfo_release(struct batadv_orig_ifinfo *orig_ifinfo)
static void batadv_orig_ifinfo_release(struct kref *ref)
{
struct batadv_orig_ifinfo *orig_ifinfo;
struct batadv_neigh_node *router;
orig_ifinfo = container_of(ref, struct batadv_orig_ifinfo, refcount);
if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
batadv_hardif_free_ref(orig_ifinfo->if_outgoing);
@ -728,8 +732,7 @@ static void batadv_orig_ifinfo_release(struct batadv_orig_ifinfo *orig_ifinfo)
*/
void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo)
{
if (atomic_dec_and_test(&orig_ifinfo->refcount))
batadv_orig_ifinfo_release(orig_ifinfo);
kref_put(&orig_ifinfo->refcount, batadv_orig_ifinfo_release);
}
/**

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

@ -25,6 +25,7 @@
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/jiffies.h>
#include <linux/kref.h>
#include <linux/netdevice.h>
#include <linux/printk.h>
#include <linux/rculist.h>
@ -497,7 +498,7 @@ batadv_find_router(struct batadv_priv *bat_priv,
hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) {
/* acquire some structures and references ... */
if (!atomic_inc_not_zero(&cand->refcount))
if (!kref_get_unless_zero(&cand->refcount))
continue;
cand_router = rcu_dereference(cand->router);
@ -524,7 +525,7 @@ batadv_find_router(struct batadv_priv *bat_priv,
/* mark the first possible candidate */
if (!first_candidate) {
atomic_inc(&cand_router->refcount);
atomic_inc(&cand->refcount);
kref_get(&cand->refcount);
first_candidate = cand;
first_candidate_router = cand_router;
}

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

@ -141,7 +141,7 @@ struct batadv_orig_ifinfo {
u32 last_real_seqno;
u8 last_ttl;
unsigned long batman_seqno_reset;
atomic_t refcount;
struct kref refcount;
struct rcu_head rcu;
};