team: do RCU update path fixups

Use rcu_access_pointer and rcu_dereference_protected
to access RCU pointer by updater.
Use RCU_INIT_POINTER for NULL assignment of RCU pointer.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 16 insertions, 6 deletions

diff --git a/drivers/net/team/team_mode_activebackup.c b/drivers/net/team/team_mode_activebackup.c
index 2fe02a8713ea..253b8a5f3427 100644
--- a/drivers/net/team/team_mode_activebackup.c
+++ b/drivers/net/team/team_mode_activebackup.c
@@ -61,8 +61,12 @@ static void ab_port_leave(struct team *team, struct team_port *port)
 
 static int ab_active_port_get(struct team *team, struct team_gsetter_ctx *ctx)
 {
-        if (ab_priv(team)->active_port)
-                ctx->data.u32_val = ab_priv(team)->active_port->dev->ifindex;
+        struct team_port *active_port;
+
+        active_port = rcu_dereference_protected(ab_priv(team)->active_port,
+                                                lockdep_is_held(&team->lock));
+        if (active_port)
+                ctx->data.u32_val = active_port->dev->ifindex;
         else
                 ctx->data.u32_val = 0;
         return 0;
diff --git a/drivers/net/team/team_mode_loadbalance.c b/drivers/net/team/team_mode_loadbalance.c
index 45cc0951aa48..c92fa02d6a63 100644
--- a/drivers/net/team/team_mode_loadbalance.c
+++ b/drivers/net/team/team_mode_loadbalance.c
@@ -96,8 +96,8 @@ static void lb_tx_hash_to_port_mapping_null_port(struct team *team,
                 struct lb_port_mapping *pm;
 
                 pm = &lb_priv->ex->tx_hash_to_port_mapping[i];
-                if (pm->port == port) {
-                        rcu_assign_pointer(pm->port, NULL);
+                if (rcu_access_pointer(pm->port) == port) {
+                        RCU_INIT_POINTER(pm->port, NULL);
                         team_option_inst_set_change(pm->opt_inst_info);
                         changed = true;
                 }
@@ -274,6 +274,7 @@ static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
 {
         struct lb_priv *lb_priv = get_lb_priv(team);
         struct sk_filter *fp = NULL;
+        struct sk_filter *orig_fp;
         struct sock_fprog *fprog = NULL;
         int err;
 
@@ -292,7 +293,9 @@ static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
         if (lb_priv->ex->orig_fprog) {
                 /* Clear old filter data */
                 __fprog_destroy(lb_priv->ex->orig_fprog);
-                sk_unattached_filter_destroy(lb_priv->fp);
+                orig_fp = rcu_dereference_protected(lb_priv->fp,
+                                                lockdep_is_held(&team->lock));
+                sk_unattached_filter_destroy(orig_fp);
         }
 
         rcu_assign_pointer(lb_priv->fp, fp);
@@ -303,9 +306,12 @@ static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
 static int lb_tx_method_get(struct team *team, struct team_gsetter_ctx *ctx)
 {
         struct lb_priv *lb_priv = get_lb_priv(team);
+        lb_select_tx_port_func_t *func;
         char *name;
 
-        name = lb_select_tx_port_get_name(lb_priv->select_tx_port_func);
+        func = rcu_dereference_protected(lb_priv->select_tx_port_func,
+                                         lockdep_is_held(&team->lock));
+        name = lb_select_tx_port_get_name(func);
         BUG_ON(!name);
         ctx->data.str_val = name;
         return 0;