From 0832cd9f1f023226527e95002d537123061ddac4 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Tue, 8 Mar 2022 11:15:10 +0200 Subject: [PATCH] net: dsa: warn if port lists aren't empty in dsa_port_teardown There has been recent work towards matching each switchdev object addition with a corresponding deletion. Therefore, having elements in the fdbs, mdbs, vlans lists at the time of a shared (DSA, CPU) port's teardown is indicative of a bug somewhere else, and not something that is to be expected. We shouldn't try to silently paper over that. Instead, print a warning and a stack trace. This change is a prerequisite for moving the initialization/teardown of these lists. Make it clear that clearing the lists isn't needed. Signed-off-by: Vladimir Oltean Signed-off-by: David S. Miller --- net/dsa/dsa2.c | 19 +++---------------- 1 file changed, 3 insertions(+), 16 deletions(-) diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c index d5f21a770689..04065d3fb09f 100644 --- a/net/dsa/dsa2.c +++ b/net/dsa/dsa2.c @@ -568,9 +568,7 @@ static void dsa_port_teardown(struct dsa_port *dp) { struct devlink_port *dlp = &dp->devlink_port; struct dsa_switch *ds = dp->ds; - struct dsa_mac_addr *a, *tmp; struct net_device *slave; - struct dsa_vlan *v, *n; if (!dp->setup) return; @@ -601,20 +599,9 @@ static void dsa_port_teardown(struct dsa_port *dp) break; } - list_for_each_entry_safe(a, tmp, &dp->fdbs, list) { - list_del(&a->list); - kfree(a); - } - - list_for_each_entry_safe(a, tmp, &dp->mdbs, list) { - list_del(&a->list); - kfree(a); - } - - list_for_each_entry_safe(v, n, &dp->vlans, list) { - list_del(&v->list); - kfree(v); - } + WARN_ON(!list_empty(&dp->fdbs)); + WARN_ON(!list_empty(&dp->mdbs)); + WARN_ON(!list_empty(&dp->vlans)); dp->setup = false; } -- 2.39.5