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authorJarno Rajahalme <jrajahalme@nicira.com>2014-05-06 01:17:28 +0400
committerPravin B Shelar <pshelar@nicira.com>2014-05-23 03:27:35 +0400
commit86ec8dbae27e5fa2b5d54f10f77286d9ef55732a (patch)
treea7234f03654ede89bb75297de731d79126556daf /net/openvswitch/flow.c
parenteb07265904d6ee95497aba0f3cbd2ae6d9c39a97 (diff)
downloadlinux-86ec8dbae27e5fa2b5d54f10f77286d9ef55732a.tar.xz
openvswitch: Fix ovs_flow_stats_get/clear RCU dereference.
For ovs_flow_stats_get() using ovsl_dereference() was wrong, since flow dumps call this with RCU read lock. ovs_flow_stats_clear() is always called with ovs_mutex, so can use ovsl_dereference(). Also, make the ovs_flow_stats_get() 'flow' argument const to make later patches cleaner. Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com> Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Diffstat (limited to 'net/openvswitch/flow.c')
-rw-r--r--net/openvswitch/flow.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 1019fc1db06e..334751cb1528 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -122,8 +122,9 @@ unlock:
spin_unlock(&stats->lock);
}
-/* Called with ovs_mutex. */
-void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
+/* Must be called with rcu_read_lock or ovs_mutex. */
+void ovs_flow_stats_get(const struct sw_flow *flow,
+ struct ovs_flow_stats *ovs_stats,
unsigned long *used, __be16 *tcp_flags)
{
int node;
@@ -133,7 +134,7 @@ void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
memset(ovs_stats, 0, sizeof(*ovs_stats));
for_each_node(node) {
- struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
+ struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]);
if (stats) {
/* Local CPU may write on non-local stats, so we must
@@ -150,12 +151,13 @@ void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
}
}
+/* Called with ovs_mutex. */
void ovs_flow_stats_clear(struct sw_flow *flow)
{
int node;
for_each_node(node) {
- struct flow_stats *stats = rcu_dereference(flow->stats[node]);
+ struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
if (stats) {
spin_lock_bh(&stats->lock);