team: remove synchronize_rcu() called during port disable

Check the unlikely case of team->en_port_count == 0 before modulo
operation.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/if_team.h b/include/linux/if_team.h
index 705459524706..b662045a81c0 100644
--- a/include/linux/if_team.h
+++ b/include/linux/if_team.h
@@ -229,6 +229,16 @@ static inline struct team_port *team_get_port_by_index(struct team *team,
                         return port;
         return NULL;
 }
+
+static inline int team_num_to_port_index(struct team *team, int num)
+{
+        int en_port_count = ACCESS_ONCE(team->en_port_count);
+
+        if (unlikely(!en_port_count))
+                return 0;
+        return num % en_port_count;
+}
+
 static inline struct team_port *team_get_port_by_index_rcu(struct team *team,
                                                            int port_index)
 {