[B.A.T.M.A.N.] [PATCH v4 11/31] batman-adv: Drop reference to netdevice on last reference

[Sven Eckelmann]

The references to the network device should be dropped inside the release
function for batadv_hard_iface similar to what is done with the batman-adv
internal datastructures.

Fixes: b25cb3ddcccd ("batman-adv: use rcu callbacks when freeing batman_if")
Signed-off-by: Sven Eckelmann <s...@narfation.org>
---
v4:
 - fix function names in commit messages
 - fix double whitespace in batadv_tt_orig_list_entry_release kerneldoc
 - add extra patch for batadv_claim_free_ref kerneldoc fix
 - change the phrase "free it" in all *_free_ref/*_put functions to "release it"
v3:
 - update copyright year
v2:
 - split patchset into fixes and kref migration to make it easier when the
   decision is made where each patch will be applied

 net/batman-adv/hard-interface.c | 13 ++++++++-----
 net/batman-adv/hard-interface.h |  6 +++---
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 49e05d2..aea4d06 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -47,13 +47,16 @@
 #include "sysfs.h"
 #include "translation-table.h"
 
-void batadv_hardif_free_rcu(struct rcu_head *rcu)
+/**
+ * batadv_hardif_release - release hard interface from lists and queue for
+ *  free after rcu grace period
+ * @hard_iface: the hard interface to free
+ */
+void batadv_hardif_release(struct batadv_hard_iface *hard_iface)
 {
-       struct batadv_hard_iface *hard_iface;
-
-       hard_iface = container_of(rcu, struct batadv_hard_iface, rcu);
        dev_put(hard_iface->net_dev);
-       kfree(hard_iface);
+
+       kfree_rcu(hard_iface, rcu);
 }
 
 struct batadv_hard_iface *
diff --git a/net/batman-adv/hard-interface.h b/net/batman-adv/hard-interface.h
index 7b12ea8..4d74c04 100644
--- a/net/batman-adv/hard-interface.h
+++ b/net/batman-adv/hard-interface.h
@@ -61,18 +61,18 @@ void batadv_hardif_disable_interface(struct 
batadv_hard_iface *hard_iface,
 void batadv_hardif_remove_interfaces(void);
 int batadv_hardif_min_mtu(struct net_device *soft_iface);
 void batadv_update_min_mtu(struct net_device *soft_iface);
-void batadv_hardif_free_rcu(struct rcu_head *rcu);
+void batadv_hardif_release(struct batadv_hard_iface *hard_iface);
 
 /**
  * batadv_hardif_free_ref - decrement the hard interface refcounter and
- *  possibly free it
+ *  possibly release it
  * @hard_iface: the hard interface to free
  */
 static inline void
 batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface)
 {
        if (atomic_dec_and_test(&hard_iface->refcount))
-               call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu);
+               batadv_hardif_release(hard_iface);
 }
 
 static inline struct batadv_hard_iface *
-- 
2.6.4