rcu: Check both root and current rcu_node when setting up future grace period

[firefly-linux-kernel-4.4.55.git] / net / openvswitch / flow.c

diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 6d8d2da0a8ec7cf01de3e30e12efaf16e36988f6..334751cb15289c4f0ca00bedec960ee1cfe19ba0 100644 (file)
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -122,7 +122,9 @@ unlock:
        spin_unlock(&stats->lock);
 }
 
-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;
@@ -132,7 +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 = rcu_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
@@ -149,12 +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);