From 449f4544267e73d5db372971da63634707c32299 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 19 May 2011 12:24:16 +0000 Subject: macvlan: remove one synchronize_rcu() call When one macvlan device is dismantled, we can avoid one synchronize_rcu() call done after deletion from hash list, since caller will perform a synchronize_net() call after its ndo_stop() call. Add a new netdev->dismantle field to signal this dismantle intent. Reduces RTNL hold time. Signed-off-by: Eric Dumazet CC: Patrick McHardy CC: Ben Greear Signed-off-by: David S. Miller --- drivers/net/macvlan.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index d7c0bc62da7f..07bcb8084d78 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -70,16 +70,17 @@ static void macvlan_hash_add(struct macvlan_dev *vlan) hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); } -static void macvlan_hash_del(struct macvlan_dev *vlan) +static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) { hlist_del_rcu(&vlan->hlist); - synchronize_rcu(); + if (sync) + synchronize_rcu(); } static void macvlan_hash_change_addr(struct macvlan_dev *vlan, const unsigned char *addr) { - macvlan_hash_del(vlan); + macvlan_hash_del(vlan, true); /* Now that we are unhashed it is safe to change the device * address without confusing packet delivery. */ @@ -345,7 +346,7 @@ static int macvlan_stop(struct net_device *dev) dev_uc_del(lowerdev, dev->dev_addr); hash_del: - macvlan_hash_del(vlan); + macvlan_hash_del(vlan, !dev->dismantle); return 0; } -- cgit v1.2.3