So switch to kref instead of using the self-made, atomic_t-based implementation.
Signed-off-by: Sven Eckelmann sven@narfation.org --- net/batman-adv/main.c | 2 +- net/batman-adv/soft-interface.c | 45 ++++++++++++++++++++++++-------------- net/batman-adv/soft-interface.h | 2 +- net/batman-adv/sysfs.c | 7 +++--- net/batman-adv/translation-table.c | 20 ++++++++--------- net/batman-adv/types.h | 2 +- 6 files changed, 46 insertions(+), 32 deletions(-)
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index 9d34be6..cfcc448 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -1234,7 +1234,7 @@ bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) vlan = batadv_softif_vlan_get(bat_priv, vid); if (vlan) { ap_isolation_enabled = atomic_read(&vlan->ap_isolation); - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); }
return ap_isolation_enabled; diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index 6c65de9..7268feb 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> @@ -478,22 +479,34 @@ out: }
/** - * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and + * 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_put - decrease the vlan object refcounter and * possibly free it * @vlan: the vlan object to release */ -void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan) +void batadv_softif_vlan_put(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; @@ -539,7 +552,7 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
vlan = batadv_softif_vlan_get(bat_priv, vid); if (vlan) { - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); return -EEXIST; }
@@ -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);
@@ -588,7 +601,7 @@ static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, vlan->vid, "vlan interface destroyed", false);
batadv_sysfs_del_vlan(bat_priv, vlan); - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); }
/** @@ -633,7 +646,7 @@ static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, if (!vlan->kobj) { ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); if (ret) { - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); return ret; } } @@ -680,7 +693,7 @@ static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, batadv_softif_destroy_vlan(bat_priv, vlan);
/* finally free the vlan object */ - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan);
return 0; } @@ -736,7 +749,7 @@ static void batadv_softif_destroy_finish(struct work_struct *work) vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); if (vlan) { batadv_softif_destroy_vlan(bat_priv, vlan); - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); }
batadv_sysfs_del_meshif(soft_iface); diff --git a/net/batman-adv/soft-interface.h b/net/batman-adv/soft-interface.h index 8e82176..3fc7392 100644 --- a/net/batman-adv/soft-interface.h +++ b/net/batman-adv/soft-interface.h @@ -34,7 +34,7 @@ void batadv_softif_destroy_sysfs(struct net_device *soft_iface); int batadv_softif_is_valid(const struct net_device *net_dev); extern struct rtnl_link_ops batadv_link_ops; int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid); -void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *softif_vlan); +void batadv_softif_vlan_put(struct batadv_softif_vlan *softif_vlan); struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, unsigned short vid);
diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c index f38d7b7..63a86c2 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; @@ -215,7 +216,7 @@ ssize_t batadv_store_vlan_##_name(struct kobject *kobj, \ attr, &vlan->_name, \ bat_priv->soft_iface); \ \ - batadv_softif_vlan_free_ref(vlan); \ + batadv_softif_vlan_put(vlan); \ return res; \ }
@@ -230,7 +231,7 @@ ssize_t batadv_show_vlan_##_name(struct kobject *kobj, \ atomic_read(&vlan->_name) == 0 ? \ "disabled" : "enabled"); \ \ - batadv_softif_vlan_free_ref(vlan); \ + batadv_softif_vlan_put(vlan); \ return res; \ }
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 1ca8831..3cac667 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -280,7 +280,7 @@ static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
atomic_add(v, &vlan->tt.num_entries);
- batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); }
/** @@ -646,7 +646,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr, if (unlikely(hash_added != 0)) { /* remove the reference for the hash */ batadv_tt_local_entry_free_ref(tt_local); - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); goto out; }
@@ -1012,7 +1012,7 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) no_purge ? 0 : last_seen_msecs, vlan->tt.crc);
- batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); } rcu_read_unlock(); } @@ -1102,8 +1102,8 @@ u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr, if (!vlan) goto out;
- batadv_softif_vlan_free_ref(vlan); - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); + batadv_softif_vlan_put(vlan);
out: if (tt_local_entry) @@ -1203,8 +1203,8 @@ static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) vlan = batadv_softif_vlan_get(bat_priv, tt_common_entry->vid); if (vlan) { - batadv_softif_vlan_free_ref(vlan); - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); + batadv_softif_vlan_put(vlan); }
batadv_tt_local_entry_free_ref(tt_local); @@ -3298,8 +3298,8 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) /* decrease the reference held for this vlan */ vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid); if (vlan) { - batadv_softif_vlan_free_ref(vlan); - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); + batadv_softif_vlan_put(vlan); }
batadv_tt_local_entry_free_ref(tt_local); @@ -3385,7 +3385,7 @@ bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst, ret = true;
out: - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); if (tt_global_entry) batadv_tt_global_entry_free_ref(tt_global_entry); if (tt_local_entry) diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 0b3cbdb..c6c3f0f 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; };