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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>
This commit is contained in:
Eric Dumazet 2011-05-09 03:35:55 +00:00 committed by David S. Miller
parent 226bd34114
commit da37e36876
2 changed files with 7 additions and 2 deletions
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1
include/net/garp.h
View File

@ -108,6 +108,7 @@ struct garp_applicant {
struct garp_port {
struct garp_applicant __rcu *applicants[GARP_APPLICATION_MAX + 1];
struct rcu_head rcu;
};
extern int garp_register_application(struct garp_application *app);

8
net/802/garp.c
View File

@ -544,6 +544,11 @@ static int garp_init_port(struct net_device *dev)
return 0;
}
static void garp_kfree_rcu(struct rcu_head *head)
{
kfree(container_of(head, struct garp_port, rcu));
}
static void garp_release_port(struct net_device *dev)
{
struct garp_port *port = rtnl_dereference(dev->garp_port);
@ -554,8 +559,7 @@ static void garp_release_port(struct net_device *dev)
return;
}
rcu_assign_pointer(dev->garp_port, NULL);
synchronize_rcu();
kfree(port);
call_rcu(&port->rcu, garp_kfree_rcu);
}
int garp_init_applicant(struct net_device *dev, struct garp_application *appl)