mirror of
https://github.com/torvalds/linux
synced 2024-07-08 20:29:39 +00:00
6340dcbd61
The commit b37a466837 ("netdevice: add the case if dev is NULL") changed
the way how the NULL check for net_devices have to be handled when trying
to reduce its reference counter. Before this commit, it was the
responsibility of the caller to check whether the object is NULL or not.
But it was changed to behave more like kfree. Now the callee has to handle
the NULL-case.
The batman-adv code was scanned via cocinelle for similar places. These
were changed to use the paradigm
@@
identifier E, T, R, C;
identifier put;
@@
void put(struct T *E)
{
+ if (!E)
+ return;
kref_put(&E->C, R);
}
Functions which were used in other sources files were moved to the header
to allow the compiler to inline the NULL check and the kref_put call.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*/
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#ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_
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#define _NET_BATMAN_ADV_HARD_INTERFACE_H_
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#include "main.h"
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#include <linux/compiler.h>
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#include <linux/kref.h>
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#include <linux/netdevice.h>
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#include <linux/notifier.h>
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#include <linux/rcupdate.h>
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#include <linux/stddef.h>
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#include <linux/types.h>
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/**
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* enum batadv_hard_if_state - State of a hard interface
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*/
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enum batadv_hard_if_state {
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/**
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* @BATADV_IF_NOT_IN_USE: interface is not used as slave interface of a
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* batman-adv soft interface
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*/
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BATADV_IF_NOT_IN_USE,
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/**
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* @BATADV_IF_TO_BE_REMOVED: interface will be removed from soft
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* interface
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*/
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BATADV_IF_TO_BE_REMOVED,
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/** @BATADV_IF_INACTIVE: interface is deactivated */
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BATADV_IF_INACTIVE,
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/** @BATADV_IF_ACTIVE: interface is used */
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BATADV_IF_ACTIVE,
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/** @BATADV_IF_TO_BE_ACTIVATED: interface is getting activated */
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BATADV_IF_TO_BE_ACTIVATED,
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};
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/**
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* enum batadv_hard_if_bcast - broadcast avoidance options
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*/
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enum batadv_hard_if_bcast {
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/** @BATADV_HARDIF_BCAST_OK: Do broadcast on according hard interface */
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BATADV_HARDIF_BCAST_OK = 0,
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/**
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* @BATADV_HARDIF_BCAST_NORECIPIENT: Broadcast not needed, there is no
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* recipient
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*/
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BATADV_HARDIF_BCAST_NORECIPIENT,
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/**
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* @BATADV_HARDIF_BCAST_DUPFWD: There is just the neighbor we got it
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* from
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*/
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BATADV_HARDIF_BCAST_DUPFWD,
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/** @BATADV_HARDIF_BCAST_DUPORIG: There is just the originator */
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BATADV_HARDIF_BCAST_DUPORIG,
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};
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extern struct notifier_block batadv_hard_if_notifier;
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struct net_device *batadv_get_real_netdev(struct net_device *net_device);
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bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface);
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bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface);
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struct batadv_hard_iface*
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batadv_hardif_get_by_netdev(const struct net_device *net_dev);
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int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
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struct net_device *soft_iface);
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void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface);
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int batadv_hardif_min_mtu(struct net_device *soft_iface);
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void batadv_update_min_mtu(struct net_device *soft_iface);
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void batadv_hardif_release(struct kref *ref);
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int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
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u8 *orig_addr, u8 *orig_neigh);
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/**
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* batadv_hardif_put() - decrement the hard interface refcounter and possibly
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* release it
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* @hard_iface: the hard interface to free
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*/
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static inline void batadv_hardif_put(struct batadv_hard_iface *hard_iface)
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{
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if (!hard_iface)
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return;
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kref_put(&hard_iface->refcount, batadv_hardif_release);
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}
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/**
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* batadv_primary_if_get_selected() - Get reference to primary interface
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* @bat_priv: the bat priv with all the soft interface information
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*
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* Return: primary interface (with increased refcnt), otherwise NULL
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*/
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static inline struct batadv_hard_iface *
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batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
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{
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struct batadv_hard_iface *hard_iface;
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rcu_read_lock();
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hard_iface = rcu_dereference(bat_priv->primary_if);
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if (!hard_iface)
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goto out;
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if (!kref_get_unless_zero(&hard_iface->refcount))
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hard_iface = NULL;
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out:
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rcu_read_unlock();
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return hard_iface;
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}
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#endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */
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