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authorSven Eckelmann <sven@narfation.org>2016-01-05 14:06:20 +0300
committerAntonio Quartulli <a@unstable.cc>2016-01-16 17:50:00 +0300
commit42eff6a617e23b691f8e4467f4687ed7245a92db (patch)
tree6d7d64bc6e77a67f067c87b1cc1c58d364738790 /net/batman-adv/originator.c
parentb4d922cfc9c08318eeb77d53b7633740e6b0efb0 (diff)
downloadlinux-42eff6a617e23b691f8e4467f4687ed7245a92db.tar.xz
batman-adv: Drop immediate orig_node free function
It is not allowed to free the memory of an object which is part of a list which is protected by rcu-read-side-critical sections without making sure that no other context is accessing the object anymore. This usually happens by removing the references to this object and then waiting until the rcu grace period is over and no one (allowedly) accesses it anymore. But the _now functions ignore this completely. They free the object directly even when a different context still tries to access it. This has to be avoided and thus these functions must be removed and all functions have to use batadv_orig_node_free_ref. Fixes: 72822225bd41 ("batman-adv: Fix rcu_barrier() miss due to double call_rcu() in TT code") 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/originator.c')
-rw-r--r--net/batman-adv/originator.c11
1 files changed, 0 insertions, 11 deletions
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 6fdef842ba2a..fe578f75c391 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -781,17 +781,6 @@ void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
batadv_orig_node_release(orig_node);
}
-/**
- * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
- * possibly free it (without rcu callback)
- * @orig_node: the orig node to free
- */
-void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
-{
- if (atomic_dec_and_test(&orig_node->refcount))
- batadv_orig_node_free_rcu(&orig_node->rcu);
-}
-
void batadv_originator_free(struct batadv_priv *bat_priv)
{
struct batadv_hashtable *hash = bat_priv->orig_hash;