diff options
| author |   Sven Eckelmann <sven@narfation.org> | 2016-01-16 10:29:42 +0100 |
|---|---|---|
| committer |   Antonio Quartulli <a@unstable.cc> | 2016-02-10 23:23:59 +0800 |
| commit | 6be4d30c18270fe275084c7cd30884535424266e (patch) | |
| tree | 24087bc20264c6edb06896b383dd3f3e504d8c46 /net/batman-adv | |
| parent | batman-adv: Convert batadv_gw_node to kref (diff) | |
| download | linux-dev-6be4d30c18270fe275084c7cd30884535424266e.tar.xz linux-dev-6be4d30c18270fe275084c7cd30884535424266e.zip | |
batman-adv: Convert batadv_softif_vlan to kref
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>
Diffstat (limited to '')
| -rw-r--r-- | net/batman-adv/soft-interface.c | 33 | ||||
| -rw-r--r-- | net/batman-adv/sysfs.c | 3 | ||||
| -rw-r--r-- | net/batman-adv/types.h | 2 |
3 files changed, 26 insertions, 12 deletions
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index 4bf35b8c3d23..d4490ff75edd 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -30,6 +30,7 @@ #include <linux/if_vlan.h> #include <linux/jiffies.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/lockdep.h> #include <linux/netdevice.h> @@ -478,8 +479,26 @@ out: } /** + * batadv_softif_vlan_release - release vlan from lists and queue for free after + * rcu grace period + * @ref: kref pointer of the vlan object + */ +static void batadv_softif_vlan_release(struct kref *ref) +{ + struct batadv_softif_vlan *vlan; + + vlan = container_of(ref, struct batadv_softif_vlan, refcount); + + spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); + hlist_del_rcu(&vlan->list); + spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); + + kfree_rcu(vlan, rcu); +} + +/** * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and - * possibly free it + * possibly release it * @vlan: the vlan object to release */ void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan) @@ -487,13 +506,7 @@ void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan) if (!vlan) return; - if (atomic_dec_and_test(&vlan->refcount)) { - spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); - hlist_del_rcu(&vlan->list); - spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); - - kfree_rcu(vlan, rcu); - } + kref_put(&vlan->refcount, batadv_softif_vlan_release); } /** @@ -514,7 +527,7 @@ struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, if (vlan_tmp->vid != vid) continue; - if (!atomic_inc_not_zero(&vlan_tmp->refcount)) + if (!kref_get_unless_zero(&vlan_tmp->refcount)) continue; vlan = vlan_tmp; @@ -549,7 +562,7 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) vlan->bat_priv = bat_priv; vlan->vid = vid; - atomic_set(&vlan->refcount, 1); + kref_init(&vlan->refcount); atomic_set(&vlan->ap_isolation, 0); diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c index 964fc5986b2c..ab4382ba3855 100644 --- a/net/batman-adv/sysfs.c +++ b/net/batman-adv/sysfs.c @@ -25,6 +25,7 @@ #include <linux/fs.h> #include <linux/if.h> #include <linux/if_vlan.h> +#include <linux/kref.h> #include <linux/kernel.h> #include <linux/netdevice.h> #include <linux/printk.h> @@ -97,7 +98,7 @@ batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj) if (vlan_tmp->kobj != obj) continue; - if (!atomic_inc_not_zero(&vlan_tmp->refcount)) + if (!kref_get_unless_zero(&vlan_tmp->refcount)) continue; vlan = vlan_tmp; diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 06c38881e382..868f6b592b7c 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -746,7 +746,7 @@ struct batadv_softif_vlan { atomic_t ap_isolation; /* boolean */ struct batadv_vlan_tt tt; struct hlist_node list; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; }; |