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garp: remove one synchronize_rcu() call
Speedup vlan dismantling in CONFIG_VLAN_8021Q_GVRP=y cases, by using a call_rcu() to free the memory instead of waiting with expensive synchronize_rcu() [ while RTNL is held ] Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Ben Greear <greearb@candelatech.com> Cc: Patrick McHardy <kaber@trash.net> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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226bd34114
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da37e36876
2 changed files with 7 additions and 2 deletions
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@ -108,6 +108,7 @@ struct garp_applicant {
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struct garp_port {
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struct garp_port {
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struct garp_applicant __rcu *applicants[GARP_APPLICATION_MAX + 1];
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struct garp_applicant __rcu *applicants[GARP_APPLICATION_MAX + 1];
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struct rcu_head rcu;
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};
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};
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extern int garp_register_application(struct garp_application *app);
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extern int garp_register_application(struct garp_application *app);
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@ -544,6 +544,11 @@ static int garp_init_port(struct net_device *dev)
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return 0;
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return 0;
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}
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}
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static void garp_kfree_rcu(struct rcu_head *head)
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{
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kfree(container_of(head, struct garp_port, rcu));
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}
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static void garp_release_port(struct net_device *dev)
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static void garp_release_port(struct net_device *dev)
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{
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{
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struct garp_port *port = rtnl_dereference(dev->garp_port);
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struct garp_port *port = rtnl_dereference(dev->garp_port);
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@ -554,8 +559,7 @@ static void garp_release_port(struct net_device *dev)
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return;
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return;
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}
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}
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rcu_assign_pointer(dev->garp_port, NULL);
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rcu_assign_pointer(dev->garp_port, NULL);
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synchronize_rcu();
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call_rcu(&port->rcu, garp_kfree_rcu);
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kfree(port);
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}
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}
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int garp_init_applicant(struct net_device *dev, struct garp_application *appl)
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int garp_init_applicant(struct net_device *dev, struct garp_application *appl)
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