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>hifive-unleashed-5.1
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e7aed321b8
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6be4d30c18
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@ -30,6 +30,7 @@
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#include <linux/if_vlan.h>
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#include <linux/if_vlan.h>
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#include <linux/jiffies.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/list.h>
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#include <linux/lockdep.h>
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#include <linux/lockdep.h>
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#include <linux/netdevice.h>
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#include <linux/netdevice.h>
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@ -477,9 +478,27 @@ out:
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return;
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return;
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}
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}
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/**
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* batadv_softif_vlan_release - release vlan from lists and queue for free after
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* rcu grace period
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* @ref: kref pointer of the vlan object
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*/
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static void batadv_softif_vlan_release(struct kref *ref)
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{
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struct batadv_softif_vlan *vlan;
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vlan = container_of(ref, struct batadv_softif_vlan, refcount);
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spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
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hlist_del_rcu(&vlan->list);
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spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
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kfree_rcu(vlan, rcu);
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}
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/**
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/**
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* batadv_softif_vlan_free_ref - decrease the vlan object refcounter and
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* batadv_softif_vlan_free_ref - decrease the vlan object refcounter and
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* possibly free it
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* possibly release it
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* @vlan: the vlan object to release
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* @vlan: the vlan object to release
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*/
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*/
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void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan)
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void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan)
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@ -487,13 +506,7 @@ void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan)
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if (!vlan)
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if (!vlan)
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return;
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return;
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if (atomic_dec_and_test(&vlan->refcount)) {
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kref_put(&vlan->refcount, batadv_softif_vlan_release);
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spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
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hlist_del_rcu(&vlan->list);
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spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
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kfree_rcu(vlan, rcu);
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}
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}
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}
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/**
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/**
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@ -514,7 +527,7 @@ struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
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if (vlan_tmp->vid != vid)
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if (vlan_tmp->vid != vid)
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continue;
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continue;
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if (!atomic_inc_not_zero(&vlan_tmp->refcount))
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if (!kref_get_unless_zero(&vlan_tmp->refcount))
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continue;
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continue;
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vlan = vlan_tmp;
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vlan = vlan_tmp;
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@ -549,7 +562,7 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
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vlan->bat_priv = bat_priv;
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vlan->bat_priv = bat_priv;
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vlan->vid = vid;
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vlan->vid = vid;
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atomic_set(&vlan->refcount, 1);
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kref_init(&vlan->refcount);
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atomic_set(&vlan->ap_isolation, 0);
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atomic_set(&vlan->ap_isolation, 0);
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@ -25,6 +25,7 @@
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#include <linux/fs.h>
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#include <linux/fs.h>
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#include <linux/if.h>
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#include <linux/if.h>
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#include <linux/if_vlan.h>
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#include <linux/if_vlan.h>
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#include <linux/kref.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/netdevice.h>
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#include <linux/printk.h>
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#include <linux/printk.h>
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@ -97,7 +98,7 @@ batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
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if (vlan_tmp->kobj != obj)
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if (vlan_tmp->kobj != obj)
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continue;
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continue;
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if (!atomic_inc_not_zero(&vlan_tmp->refcount))
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if (!kref_get_unless_zero(&vlan_tmp->refcount))
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continue;
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continue;
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vlan = vlan_tmp;
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vlan = vlan_tmp;
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@ -746,7 +746,7 @@ struct batadv_softif_vlan {
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atomic_t ap_isolation; /* boolean */
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atomic_t ap_isolation; /* boolean */
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struct batadv_vlan_tt tt;
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struct batadv_vlan_tt tt;
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struct hlist_node list;
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struct hlist_node list;
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atomic_t refcount;
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struct kref refcount;
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struct rcu_head rcu;
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struct rcu_head rcu;
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};
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};
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