diff options
Diffstat (limited to 'net/batman-adv/hard-interface.c')
| -rw-r--r-- | net/batman-adv/hard-interface.c | 54 |
1 files changed, 32 insertions, 22 deletions
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index 57f7107169f5..b22b2775a0a5 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -18,6 +18,7 @@ #include "hard-interface.h" #include "main.h" +#include <linux/atomic.h> #include <linux/bug.h> #include <linux/byteorder/generic.h> #include <linux/errno.h> @@ -26,6 +27,7 @@ #include <linux/if_ether.h> #include <linux/if.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/netdevice.h> #include <linux/printk.h> @@ -47,13 +49,19 @@ #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 + * @ref: kref pointer of the hard interface + */ +void batadv_hardif_release(struct kref *ref) { struct batadv_hard_iface *hard_iface; - hard_iface = container_of(rcu, struct batadv_hard_iface, rcu); + hard_iface = container_of(ref, struct batadv_hard_iface, refcount); dev_put(hard_iface->net_dev); - kfree(hard_iface); + + kfree_rcu(hard_iface, rcu); } struct batadv_hard_iface * @@ -64,7 +72,7 @@ batadv_hardif_get_by_netdev(const struct net_device *net_dev) rcu_read_lock(); list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { if (hard_iface->net_dev == net_dev && - atomic_inc_not_zero(&hard_iface->refcount)) + kref_get_unless_zero(&hard_iface->refcount)) goto out; } @@ -107,7 +115,7 @@ static bool batadv_mutual_parents(const struct net_device *dev1, * This function recursively checks all the fathers of the device passed as * argument looking for a batman-adv soft interface. * - * Returns true if the device is descendant of a batman-adv mesh interface (or + * Return: true if the device is descendant of a batman-adv mesh interface (or * if it is a batman-adv interface itself), false otherwise */ static bool batadv_is_on_batman_iface(const struct net_device *net_dev) @@ -161,7 +169,7 @@ static int batadv_is_valid_iface(const struct net_device *net_dev) * interface * @net_device: the device to check * - * Returns true if the net device is a 802.11 wireless device, false otherwise. + * Return: true if the net device is a 802.11 wireless device, false otherwise. */ bool batadv_is_wifi_netdev(struct net_device *net_device) { @@ -194,7 +202,7 @@ batadv_hardif_get_active(const struct net_device *soft_iface) continue; if (hard_iface->if_status == BATADV_IF_ACTIVE && - atomic_inc_not_zero(&hard_iface->refcount)) + kref_get_unless_zero(&hard_iface->refcount)) goto out; } @@ -218,7 +226,7 @@ static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, batadv_bla_update_orig_address(bat_priv, primary_if, oldif); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } static void batadv_primary_if_select(struct batadv_priv *bat_priv, @@ -228,7 +236,7 @@ static void batadv_primary_if_select(struct batadv_priv *bat_priv, ASSERT_RTNL(); - if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) + if (new_hard_iface && !kref_get_unless_zero(&new_hard_iface->refcount)) new_hard_iface = NULL; curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); @@ -242,7 +250,7 @@ static void batadv_primary_if_select(struct batadv_priv *bat_priv, out: if (curr_hard_iface) - batadv_hardif_free_ref(curr_hard_iface); + batadv_hardif_put(curr_hard_iface); } static bool @@ -401,7 +409,7 @@ batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } static void @@ -426,7 +434,8 @@ batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) * * Invoke ndo_del_slave on master passing slave as argument. In this way slave * is free'd and master can correctly change its internal state. - * Return 0 on success, a negative value representing the error otherwise + * + * Return: 0 on success, a negative value representing the error otherwise */ static int batadv_master_del_slave(struct batadv_hard_iface *slave, struct net_device *master) @@ -455,7 +464,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) goto out; - if (!atomic_inc_not_zero(&hard_iface->refcount)) + if (!kref_get_unless_zero(&hard_iface->refcount)) goto out; soft_iface = dev_get_by_name(&init_net, iface_name); @@ -553,7 +562,7 @@ err_dev: hard_iface->soft_iface = NULL; dev_put(soft_iface); err: - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); return ret; } @@ -584,7 +593,7 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, batadv_primary_if_select(bat_priv, new_if); if (new_if) - batadv_hardif_free_ref(new_if); + batadv_hardif_put(new_if); } bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); @@ -607,11 +616,11 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, } hard_iface->soft_iface = NULL; - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } /** @@ -630,7 +639,7 @@ static void batadv_hardif_remove_interface_finish(struct work_struct *work) batadv_debugfs_del_hardif(hard_iface); batadv_sysfs_del_hardif(&hard_iface->hardif_obj); - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); } static struct batadv_hard_iface * @@ -676,7 +685,8 @@ batadv_hardif_add_interface(struct net_device *net_dev) hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; /* extra reference for return */ - atomic_set(&hard_iface->refcount, 2); + kref_init(&hard_iface->refcount); + kref_get(&hard_iface->refcount); batadv_check_known_mac_addr(hard_iface->net_dev); list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); @@ -784,10 +794,10 @@ static int batadv_hard_if_event(struct notifier_block *this, } hardif_put: - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return NOTIFY_DONE; } |