[B.A.T.M.A.N.] [PATCH 3/3] batman-adv: protect the local and the global trans-tables with rcu

Antonio Quartulli
2011-05-09T09:49:11Z

The local and the global translation-tables are now lock free and rcu
protected.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
---
main.c | 2 -
routing.c | 2 -
translation-table.c | 256 +++++++++++++++++++++++++++++----------------------
types.h | 6 +-
vis.c | 13 +--
5 files changed, 155 insertions(+), 124 deletions(-)

diff --git a/main.c b/main.c
index 6e96fd6..5f3cab1 100644
--- a/main.c
+++ b/main.c
@@ -84,8 +84,6 @@ int mesh_init(struct net_device *soft_iface)

spin_lock_init(&bat_priv->forw_bat_list_lock);
spin_lock_init(&bat_priv->forw_bcast_list_lock);
- spin_lock_init(&bat_priv->tt_lhash_lock);
- spin_lock_init(&bat_priv->tt_ghash_lock);
spin_lock_init(&bat_priv->tt_changes_list_lock);
spin_lock_init(&bat_priv->tt_req_list_lock);
spin_lock_init(&bat_priv->tt_roam_list_lock);
diff --git a/routing.c b/routing.c
index 00b0dee..b681568 100644
--- a/routing.c
+++ b/routing.c
@@ -89,9 +89,7 @@ static void update_transtable(struct bat_priv *bat_priv,
/* Even if we received the crc into the OGM, we prefer
* to recompute it to spot any possible inconsistency
* in the global table */
- spin_lock_bh(&bat_priv->tt_ghash_lock);
orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
- spin_unlock_bh(&bat_priv->tt_ghash_lock);
/* Roaming phase is over: tables are in sync again. I can
* unset the flag */
orig_node->tt_poss_change = false;
diff --git a/translation-table.c b/translation-table.c
index d14072f..be4f851 100644
--- a/translation-table.c
+++ b/translation-table.c
@@ -78,6 +78,9 @@ static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
if (!compare_eth(tt_local_entry, data))
continue;

+ if (!atomic_inc_not_zero(&tt_local_entry->refcount))
+ continue;
+
tt_local_entry_tmp = tt_local_entry;
break;
}
@@ -107,6 +110,9 @@ static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
if (!compare_eth(tt_global_entry, data))
continue;

+ if (!atomic_inc_not_zero(&tt_global_entry->refcount))
+ continue;
+
tt_global_entry_tmp = tt_global_entry;
break;
}
@@ -123,8 +129,36 @@ static bool is_out_of_time(unsigned long starting_time, unsigned long timeout)
return time_after(jiffies, deadline);
}

+static void tt_local_entry_free_rcu(struct rcu_head *rcu)
+{
+ struct tt_local_entry *tt_local_entry;
+
+ tt_local_entry = container_of(rcu, struct tt_local_entry, rcu);
+ kfree(tt_local_entry);
+}
+
+static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
+{
+ if (atomic_dec_and_test(&tt_local_entry->refcount))
+ call_rcu(&tt_local_entry->rcu, tt_local_entry_free_rcu);
+}
+
+static void tt_global_entry_free_rcu(struct rcu_head *rcu)
+{
+ struct tt_global_entry *tt_global_entry;
+
+ tt_global_entry = container_of(rcu, struct tt_global_entry, rcu);
+ kfree(tt_global_entry);
+}
+
+static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)
+{
+ if (atomic_dec_and_test(&tt_global_entry->refcount))
+ call_rcu(&tt_global_entry->rcu, tt_global_entry_free_rcu);
+}
+
static void tt_local_event(struct bat_priv *bat_priv, uint8_t op, uint8_t *addr,
- uint8_t roaming)
+ bool roaming)
{
struct tt_change_node *tt_change_node;

@@ -170,22 +204,19 @@ static int tt_local_init(struct bat_priv *bat_priv)
void tt_local_add(struct net_device *soft_iface, uint8_t *addr)
{
struct bat_priv *bat_priv = netdev_priv(soft_iface);
- struct tt_local_entry *tt_local_entry;
- struct tt_global_entry *tt_global_entry;
- uint8_t roam_addr[ETH_ALEN];
- struct orig_node *roam_orig_node;
+ struct tt_local_entry *tt_local_entry = NULL;
+ struct tt_global_entry *tt_global_entry = NULL;

- spin_lock_bh(&bat_priv->tt_lhash_lock);
tt_local_entry = tt_local_hash_find(bat_priv, addr);

if (tt_local_entry) {
tt_local_entry->last_seen = jiffies;
- goto unlock;
+ goto out;
}

tt_local_entry = kmalloc(sizeof(struct tt_local_entry), GFP_ATOMIC);
if (!tt_local_entry)
- goto unlock;
+ goto out;

tt_local_event(bat_priv, TT_CHANGE_ADD, addr, false);

@@ -195,6 +226,7 @@ void tt_local_add(struct net_device *soft_iface, uint8_t *addr)

memcpy(tt_local_entry->addr, addr, ETH_ALEN);
tt_local_entry->last_seen = jiffies;
+ atomic_set(&tt_local_entry->refcount, 2);

/* the batman interface mac address should never be purged */
if (compare_eth(addr, soft_iface->dev_addr))
@@ -204,31 +236,26 @@ void tt_local_add(struct net_device *soft_iface, uint8_t *addr)

hash_add(bat_priv->tt_local_hash, compare_ltt, choose_orig,
tt_local_entry, &tt_local_entry->hash_entry);
+
atomic_inc(&bat_priv->num_local_tt);
- spin_unlock_bh(&bat_priv->tt_lhash_lock);

/* remove address from global hash if present */
- spin_lock_bh(&bat_priv->tt_ghash_lock);
-
tt_global_entry = tt_global_hash_find(bat_priv, addr);

/* Check whether it is a roaming! */
if (tt_global_entry) {
- memcpy(roam_addr, tt_global_entry->addr, ETH_ALEN);
- roam_orig_node = tt_global_entry->orig_node;
/* This node is probably going to update its tt table */
tt_global_entry->orig_node->tt_poss_change = true;
_tt_global_del(bat_priv, tt_global_entry,
"local tt received");
- spin_unlock_bh(&bat_priv->tt_ghash_lock);
send_roam_adv(bat_priv, tt_global_entry->addr,
- tt_global_entry->orig_node);
- } else
- spin_unlock_bh(&bat_priv->tt_ghash_lock);
-
- return;
-unlock:
- spin_unlock_bh(&bat_priv->tt_lhash_lock);
+ tt_global_entry->orig_node);
+ }
+out:
+ if (tt_local_entry)
+ tt_local_entry_free_ref(tt_local_entry);
+ if (tt_global_entry)
+ tt_global_entry_free_ref(tt_global_entry);
}

int tt_changes_fill_buffer(struct bat_priv *bat_priv,
@@ -310,8 +337,6 @@ int tt_local_seq_print_text(struct seq_file *seq, void *offset)
"announced via TT (TTVN: %u):\n",
net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));

- spin_lock_bh(&bat_priv->tt_lhash_lock);
-
buf_size = 1;
/* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
for (i = 0; i < hash->size; i++) {
@@ -325,7 +350,6 @@ int tt_local_seq_print_text(struct seq_file *seq, void *offset)

buff = kmalloc(buf_size, GFP_ATOMIC);
if (!buff) {
- spin_unlock_bh(&bat_priv->tt_lhash_lock);
ret = -ENOMEM;
goto out;
}
@@ -345,8 +369,6 @@ int tt_local_seq_print_text(struct seq_file *seq, void *offset)
rcu_read_unlock();
}

- spin_unlock_bh(&bat_priv->tt_lhash_lock);
-
seq_printf(seq, "%s", buff);
kfree(buff);
out:
@@ -355,15 +377,6 @@ out:
return ret;
}

-static void tt_local_entry_free(struct hlist_node *node, void *arg)
-{
- struct bat_priv *bat_priv = (struct bat_priv *)arg;
- void *data = container_of(node, struct tt_local_entry, hash_entry);
-
- kfree(data);
- atomic_dec(&bat_priv->num_local_tt);
-}
-
static void tt_local_del(struct bat_priv *bat_priv,
struct tt_local_entry *tt_local_entry,
char *message)
@@ -376,23 +389,24 @@ static void tt_local_del(struct bat_priv *bat_priv,
hash_remove(bat_priv->tt_local_hash, compare_ltt, choose_orig,
tt_local_entry->addr);

- tt_local_entry_free(&tt_local_entry->hash_entry, bat_priv);
+ tt_local_entry_free_ref(tt_local_entry);
}

void tt_local_remove(struct bat_priv *bat_priv, uint8_t *addr,
char *message, bool roaming)
{
- struct tt_local_entry *tt_local_entry;
+ struct tt_local_entry *tt_local_entry = NULL;

- spin_lock_bh(&bat_priv->tt_lhash_lock);
tt_local_entry = tt_local_hash_find(bat_priv, addr);

- if (tt_local_entry) {
- tt_local_event(bat_priv, TT_CHANGE_DEL, tt_local_entry->addr,
- roaming);
- tt_local_del(bat_priv, tt_local_entry, message);
- }
- spin_unlock_bh(&bat_priv->tt_lhash_lock);
+ if (!tt_local_entry)
+ goto out;
+
+ tt_local_event(bat_priv, TT_CHANGE_DEL, tt_local_entry->addr, roaming);
+ tt_local_del(bat_priv, tt_local_entry, message);
+out:
+ if (tt_local_entry)
+ tt_local_entry_free_ref(tt_local_entry);
}

static void tt_local_purge(struct bat_priv *bat_priv)
@@ -401,13 +415,14 @@ static void tt_local_purge(struct bat_priv *bat_priv)
struct tt_local_entry *tt_local_entry;
struct hlist_node *node, *node_tmp;
struct hlist_head *head;
+ spinlock_t *list_lock; /* protects write access to the hash lists */
int i;

- spin_lock_bh(&bat_priv->tt_lhash_lock);
-
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
+ list_lock = &hash->list_locks[i];

+ spin_lock_bh(list_lock);
hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
head, hash_entry) {
if (tt_local_entry->never_purge)
@@ -419,22 +434,26 @@ static void tt_local_purge(struct bat_priv *bat_priv)

tt_local_event(bat_priv, TT_CHANGE_DEL,
tt_local_entry->addr, false);
- tt_local_del(bat_priv, tt_local_entry,
- "address timed out");
+ atomic_dec(&bat_priv->num_local_tt);
+ bat_dbg(DBG_TT, bat_priv, "Deleting local "
+ "tt entry (%pM): timed out\n",
+ tt_local_entry->addr);
+ hlist_del_rcu(node);
+ tt_local_entry_free_ref(tt_local_entry);
}
+ spin_unlock_bh(list_lock);
}

- spin_unlock_bh(&bat_priv->tt_lhash_lock);
}

static void tt_local_table_free(struct bat_priv *bat_priv)
{
struct hashtable_t *hash;
- int i;
spinlock_t *list_lock; /* protects write access to the hash lists */
- struct hlist_head *head;
- struct hlist_node *node, *node_tmp;
struct tt_local_entry *tt_local_entry;
+ struct hlist_node *node, *node_tmp;
+ struct hlist_head *head;
+ int i;

if (!bat_priv->tt_local_hash)
return;
@@ -449,7 +468,7 @@ static void tt_local_table_free(struct bat_priv *bat_priv)
hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
head, hash_entry) {
hlist_del_rcu(node);
- kfree(tt_local_entry);
+ tt_local_entry_free_ref(tt_local_entry);
}
spin_unlock_bh(list_lock);
}
@@ -494,10 +513,9 @@ int tt_global_add(struct bat_priv *bat_priv,
unsigned char *tt_addr, uint8_t ttvn, bool roaming)
{
struct tt_global_entry *tt_global_entry;
- struct tt_local_entry *tt_local_entry;
struct orig_node *orig_node_tmp;
+ int ret = 0;

- spin_lock_bh(&bat_priv->tt_ghash_lock);
tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);

if (!tt_global_entry) {
@@ -505,17 +523,20 @@ int tt_global_add(struct bat_priv *bat_priv,
kmalloc(sizeof(struct tt_global_entry),
GFP_ATOMIC);
if (!tt_global_entry)
- goto unlock;
+ goto out;
+
memcpy(tt_global_entry->addr, tt_addr, ETH_ALEN);
/* Assign the new orig_node */
atomic_inc(&orig_node->refcount);
tt_global_entry->orig_node = orig_node;
tt_global_entry->ttvn = ttvn;
tt_global_entry->flags = 0x00;
- atomic_inc(&orig_node->tt_size);
+ atomic_set(&tt_global_entry->refcount, 2);
+
hash_add(bat_priv->tt_global_hash, compare_gtt,
choose_orig, tt_global_entry,
&tt_global_entry->hash_entry);
+ atomic_inc(&orig_node->tt_size);
} else {
if (tt_global_entry->orig_node != orig_node) {
atomic_dec(&tt_global_entry->orig_node->tt_size);
@@ -529,25 +550,18 @@ int tt_global_add(struct bat_priv *bat_priv,
}
}

- spin_unlock_bh(&bat_priv->tt_ghash_lock);
-
bat_dbg(DBG_TT, bat_priv,
"Creating new global tt entry: %pM (via %pM)\n",
tt_global_entry->addr, orig_node->orig);

/* remove address from local hash if present */
- spin_lock_bh(&bat_priv->tt_lhash_lock);
- tt_local_entry = tt_local_hash_find(bat_priv, tt_addr);
-
- if (tt_local_entry)
- tt_local_remove(bat_priv, tt_global_entry->addr,
- "global tt received", roaming);
-
- spin_unlock_bh(&bat_priv->tt_lhash_lock);
- return 1;
-unlock:
- spin_unlock_bh(&bat_priv->tt_ghash_lock);
- return 0;
+ tt_local_remove(bat_priv, tt_global_entry->addr,
+ "global tt received", roaming);
+ ret = 1;
+out:
+ if (tt_global_entry)
+ tt_global_entry_free_ref(tt_global_entry);
+ return ret;
}

int tt_global_seq_print_text(struct seq_file *seq, void *offset)
@@ -584,8 +598,6 @@ int tt_global_seq_print_text(struct seq_file *seq, void *offset)
seq_printf(seq, " %-13s %s %-15s %s\n",
"Client", "(TTVN)", "Originator", "(Curr TTVN)");

- spin_lock_bh(&bat_priv->tt_ghash_lock);
-
buf_size = 1;
/* Estimate length for: " * xx:xx:xx:xx:xx:xx (ttvn) via
* xx:xx:xx:xx:xx:xx (cur_ttvn)\n"*/
@@ -600,10 +612,10 @@ int tt_global_seq_print_text(struct seq_file *seq, void *offset)

buff = kmalloc(buf_size, GFP_ATOMIC);
if (!buff) {
- spin_unlock_bh(&bat_priv->tt_ghash_lock);
ret = -ENOMEM;
goto out;
}
+
buff[0] = '\0';
pos = 0;

@@ -625,8 +637,6 @@ int tt_global_seq_print_text(struct seq_file *seq, void *offset)
rcu_read_unlock();
}

- spin_unlock_bh(&bat_priv->tt_ghash_lock);
-
seq_printf(seq, "%s", buff);
kfree(buff);
out:
@@ -640,7 +650,7 @@ static void _tt_global_del(struct bat_priv *bat_priv,
char *message)
{
if (!tt_global_entry)
- return;
+ goto out;

bat_dbg(DBG_TT, bat_priv,
"Deleting global tt entry %pM (via %pM): %s\n",
@@ -648,30 +658,34 @@ static void _tt_global_del(struct bat_priv *bat_priv,
message);

atomic_dec(&tt_global_entry->orig_node->tt_size);
+
hash_remove(bat_priv->tt_global_hash, compare_gtt, choose_orig,
tt_global_entry->addr);
- kfree(tt_global_entry);
+out:
+ if (tt_global_entry)
+ tt_global_entry_free_ref(tt_global_entry);
}

void tt_global_del(struct bat_priv *bat_priv,
struct orig_node *orig_node,
unsigned char *addr, char *message, bool roaming)
{
- struct tt_global_entry *tt_global_entry;
+ struct tt_global_entry *tt_global_entry = NULL;

- spin_lock_bh(&bat_priv->tt_ghash_lock);
tt_global_entry = tt_global_hash_find(bat_priv, addr);
+ if (!tt_global_entry)
+ goto out;

- if (tt_global_entry && tt_global_entry->orig_node == orig_node) {
+ if (tt_global_entry->orig_node == orig_node) {
if (roaming) {
tt_global_entry->flags |= TT_GLOBAL_ROAM;
goto out;
}
- atomic_dec(&orig_node->tt_size);
_tt_global_del(bat_priv, tt_global_entry, message);
}
out:
- spin_unlock_bh(&bat_priv->tt_ghash_lock);
+ if (tt_global_entry)
+ tt_global_entry_free_ref(tt_global_entry);
}

void tt_global_del_orig(struct bat_priv *bat_priv,
@@ -682,38 +696,59 @@ void tt_global_del_orig(struct bat_priv *bat_priv,
struct hashtable_t *hash = bat_priv->tt_global_hash;
struct hlist_node *node, *safe;
struct hlist_head *head;
+ spinlock_t *list_lock; /* protects write access to the hash lists */

- if (!bat_priv->tt_global_hash)
- return;
-
- spin_lock_bh(&bat_priv->tt_ghash_lock);
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
+ list_lock = &hash->list_locks[i];

+ spin_lock_bh(list_lock);
hlist_for_each_entry_safe(tt_global_entry, node, safe,
head, hash_entry) {
- if (tt_global_entry->orig_node == orig_node)
- _tt_global_del(bat_priv, tt_global_entry,
- message);
+ if (tt_global_entry->orig_node == orig_node) {
+ bat_dbg(DBG_TT, bat_priv,
+ "Deleting global tt entry %pM "
+ "(via %pM): originator time out\n",
+ tt_global_entry->addr,
+ tt_global_entry->orig_node->orig);
+ hlist_del_rcu(node);
+ tt_global_entry_free_ref(tt_global_entry);
+ }
}
+ spin_unlock_bh(list_lock);
}
atomic_set(&orig_node->tt_size, 0);
-
- spin_unlock_bh(&bat_priv->tt_ghash_lock);
-}
-
-static void tt_global_entry_free(struct hlist_node *node, void *arg)
-{
- void *data = container_of(node, struct tt_global_entry, hash_entry);
- kfree(data);
}

static void tt_global_table_free(struct bat_priv *bat_priv)
{
+ struct hashtable_t *hash;
+ spinlock_t *list_lock; /* protects write access to the hash lists */
+ struct tt_global_entry *tt_global_entry;
+ struct hlist_node *node, *node_tmp;
+ struct hlist_head *head;
+ int i;
+
if (!bat_priv->tt_global_hash)
return;

- hash_delete(bat_priv->tt_global_hash, tt_global_entry_free, NULL);
+ hash = bat_priv->tt_global_hash;
+
+ for (i = 0; i < hash->size; i++) {
+ head = &hash->table[i];
+ list_lock = &hash->list_locks[i];
+
+ spin_lock_bh(list_lock);
+ hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
+ head, hash_entry) {
+ hlist_del_rcu(node);
+ tt_global_entry_free_ref(tt_global_entry);
+ }
+ spin_unlock_bh(list_lock);
+ }
+
+ hash_destroy(hash);
+
bat_priv->tt_global_hash = NULL;
}

@@ -722,19 +757,19 @@ struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr)
struct tt_global_entry *tt_global_entry;
struct orig_node *orig_node = NULL;

- spin_lock_bh(&bat_priv->tt_ghash_lock);
tt_global_entry = tt_global_hash_find(bat_priv, addr);

if (!tt_global_entry)
goto out;

if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
- goto out;
+ goto free_tt;

orig_node = tt_global_entry->orig_node;

+free_tt:
+ tt_global_entry_free_ref(tt_global_entry);
out:
- spin_unlock_bh(&bat_priv->tt_ghash_lock);
return orig_node;
}

@@ -797,7 +832,6 @@ uint16_t tt_local_crc(struct bat_priv *bat_priv)
tt_local_entry->addr[j]);
total ^= total_one;
}
-
rcu_read_unlock();
}

@@ -1349,15 +1383,17 @@ void tt_update_changes(struct bat_priv *bat_priv, struct orig_node *orig_node,

bool is_my_client(struct bat_priv *bat_priv, uint8_t *addr)
{
- struct tt_local_entry *tt_local_entry;
+ struct tt_local_entry *tt_local_entry = NULL;
+ bool ret = false;

- spin_lock_bh(&bat_priv->tt_lhash_lock);
tt_local_entry = tt_local_hash_find(bat_priv, addr);
- spin_unlock_bh(&bat_priv->tt_lhash_lock);
-
+ if (!tt_local_entry)
+ goto out;
+ ret = true;
+out:
if (tt_local_entry)
- return true;
- return false;
+ tt_local_entry_free_ref(tt_local_entry);
+ return ret;
}

void handle_tt_response(struct bat_priv *bat_priv,
@@ -1394,9 +1430,7 @@ void handle_tt_response(struct bat_priv *bat_priv,
spin_unlock_bh(&bat_priv->tt_req_list_lock);

/* Recalculate the CRC for this orig_node and store it */
- spin_lock_bh(&bat_priv->tt_ghash_lock);
orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
- spin_unlock_bh(&bat_priv->tt_ghash_lock);
/* Roaming phase is over: tables are in sync again. I can
* unset the flag */
orig_node->tt_poss_change = false;
diff --git a/types.h b/types.h
index b148bc3..fdc6993 100644
--- a/types.h
+++ b/types.h
@@ -190,8 +190,6 @@ struct bat_priv {
spinlock_t forw_bat_list_lock; /* protects forw_bat_list */
spinlock_t forw_bcast_list_lock; /* protects */
spinlock_t tt_changes_list_lock; /* protects tt_changes */
- spinlock_t tt_lhash_lock; /* protects tt_local_hash */
- spinlock_t tt_ghash_lock; /* protects tt_global_hash */
spinlock_t tt_req_list_lock; /* protects tt_req_list */
spinlock_t tt_roam_list_lock; /* protects tt_roam_list */
spinlock_t gw_list_lock; /* protects gw_list and curr_gw */
@@ -232,6 +230,8 @@ struct tt_local_entry {
uint8_t addr[ETH_ALEN];
unsigned long last_seen;
char never_purge;
+ atomic_t refcount;
+ struct rcu_head rcu;
struct hlist_node hash_entry;
};

@@ -240,6 +240,8 @@ struct tt_global_entry {
struct orig_node *orig_node;
uint8_t ttvn;
uint8_t flags; /* only TT_GLOBAL_ROAM is used */
+ atomic_t refcount;
+ struct rcu_head rcu;
struct hlist_node hash_entry; /* entry in the global table */
};

diff --git a/vis.c b/vis.c
index c39f20c..4c27950 100644
--- a/vis.c
+++ b/vis.c
@@ -680,11 +680,12 @@ next:

hash = bat_priv->tt_local_hash;

- spin_lock_bh(&bat_priv->tt_lhash_lock);
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];

- hlist_for_each_entry(tt_local_entry, node, head, hash_entry) {
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(tt_local_entry, node, head,
+ hash_entry) {
entry = (struct vis_info_entry *)
skb_put(info->skb_packet,
sizeof(*entry));
@@ -693,14 +694,12 @@ next:
entry->quality = 0; /* 0 means TT */
packet->entries++;

- if (vis_packet_full(info)) {
- spin_unlock_bh(&bat_priv->tt_lhash_lock);
- return 0;
- }
+ if (vis_packet_full(info))
+ goto unlock;
}
+ rcu_read_unlock();
}

- spin_unlock_bh(&bat_priv->tt_lhash_lock);
return 0;

unlock:
--
1.7.3.4