summaryrefslogtreecommitdiff
path: root/net/batman-adv
diff options
context:
space:
mode:
authorSven Eckelmann <sven@narfation.org>2018-10-31 00:01:25 +0300
committerSimon Wunderlich <sw@simonwunderlich.de>2018-11-12 12:41:51 +0300
commit05abd7bcc9cdbedf9deff27fe0766c70c4f2ae0d (patch)
treec389b27c0b16e602363268f48f34f0188e1d912f /net/batman-adv
parentfb69be697916a2d0a9badcdef7f20fcfad1233bc (diff)
downloadlinux-05abd7bcc9cdbedf9deff27fe0766c70c4f2ae0d.tar.xz
batman-adv: Store modification counter via hash helpers
Multiple datastructures use the hash helper functions to add and remove entries from the simple hlist based hashes. These are often also dumped to userspace via netlink and thus should have a generation sequence counter. Reported-by: Matthias Schiffer <mschiffer@universe-factory.net> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Diffstat (limited to 'net/batman-adv')
-rw-r--r--net/batman-adv/hash.c2
-rw-r--r--net/batman-adv/hash.h6
2 files changed, 8 insertions, 0 deletions
diff --git a/net/batman-adv/hash.c b/net/batman-adv/hash.c
index 7b49e4001778..9194f4d891b1 100644
--- a/net/batman-adv/hash.c
+++ b/net/batman-adv/hash.c
@@ -32,6 +32,8 @@ static void batadv_hash_init(struct batadv_hashtable *hash)
INIT_HLIST_HEAD(&hash->table[i]);
spin_lock_init(&hash->list_locks[i]);
}
+
+ atomic_set(&hash->generation, 0);
}
/**
diff --git a/net/batman-adv/hash.h b/net/batman-adv/hash.h
index 9490a7ca2ba6..0e36fa1c7c3e 100644
--- a/net/batman-adv/hash.h
+++ b/net/batman-adv/hash.h
@@ -21,6 +21,7 @@
#include "main.h"
+#include <linux/atomic.h>
#include <linux/compiler.h>
#include <linux/list.h>
#include <linux/rculist.h>
@@ -58,6 +59,9 @@ struct batadv_hashtable {
/** @size: size of hashtable */
u32 size;
+
+ /** @generation: current (generation) sequence number */
+ atomic_t generation;
};
/* allocates and clears the hash */
@@ -112,6 +116,7 @@ static inline int batadv_hash_add(struct batadv_hashtable *hash,
/* no duplicate found in list, add new element */
hlist_add_head_rcu(data_node, head);
+ atomic_inc(&hash->generation);
ret = 0;
@@ -154,6 +159,7 @@ static inline void *batadv_hash_remove(struct batadv_hashtable *hash,
data_save = node;
hlist_del_rcu(node);
+ atomic_inc(&hash->generation);
break;
}
spin_unlock_bh(&hash->list_locks[index]);