From 1e66dafc75f40a08b2addb82779987b269b4ca23 Mon Sep 17 00:00:00 2001 From: Simon Horman Date: Mon, 31 Aug 2009 14:18:48 +0200 Subject: ipvs: Use atomic operations atomicly A pointed out by Shin Hong, IPVS doesn't always use atomic operations in an atomic manner. While this seems unlikely to be manifest in strange behaviour, it seems appropriate to clean this up. Cc: shin hong Signed-off-by: Simon Horman Signed-off-by: Patrick McHardy --- net/netfilter/ipvs/ip_vs_core.c | 6 +++--- net/netfilter/ipvs/ip_vs_wrr.c | 7 ++++--- 2 files changed, 7 insertions(+), 6 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c index b227750af75..a986ee20e12 100644 --- a/net/netfilter/ipvs/ip_vs_core.c +++ b/net/netfilter/ipvs/ip_vs_core.c @@ -1259,7 +1259,7 @@ ip_vs_in(unsigned int hooknum, struct sk_buff *skb, struct ip_vs_iphdr iph; struct ip_vs_protocol *pp; struct ip_vs_conn *cp; - int ret, restart, af; + int ret, restart, af, pkts; af = (skb->protocol == htons(ETH_P_IP)) ? AF_INET : AF_INET6; @@ -1346,12 +1346,12 @@ ip_vs_in(unsigned int hooknum, struct sk_buff *skb, * Sync connection if it is about to close to * encorage the standby servers to update the connections timeout */ - atomic_inc(&cp->in_pkts); + pkts = atomic_add_return(1, &cp->in_pkts); if (af == AF_INET && (ip_vs_sync_state & IP_VS_STATE_MASTER) && (((cp->protocol != IPPROTO_TCP || cp->state == IP_VS_TCP_S_ESTABLISHED) && - (atomic_read(&cp->in_pkts) % sysctl_ip_vs_sync_threshold[1] + (pkts % sysctl_ip_vs_sync_threshold[1] == sysctl_ip_vs_sync_threshold[0])) || ((cp->protocol == IPPROTO_TCP) && (cp->old_state != cp->state) && ((cp->state == IP_VS_TCP_S_FIN_WAIT) || diff --git a/net/netfilter/ipvs/ip_vs_wrr.c b/net/netfilter/ipvs/ip_vs_wrr.c index 70ff82cda57..6182e8ea0be 100644 --- a/net/netfilter/ipvs/ip_vs_wrr.c +++ b/net/netfilter/ipvs/ip_vs_wrr.c @@ -77,11 +77,12 @@ static int ip_vs_wrr_gcd_weight(struct ip_vs_service *svc) static int ip_vs_wrr_max_weight(struct ip_vs_service *svc) { struct ip_vs_dest *dest; - int weight = 0; + int new_weight, weight = 0; list_for_each_entry(dest, &svc->destinations, n_list) { - if (atomic_read(&dest->weight) > weight) - weight = atomic_read(&dest->weight); + new_weight = atomic_read(&dest->weight); + if (new_weight > weight) + weight = new_weight; } return weight; -- cgit v1.2.3