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net: dsa: warn if port lists aren't empty in dsa_port_teardown

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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 <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2022-03-08 11:15:10 +02:00 committed by David S. Miller
parent ce7ec1b8ec
commit 0832cd9f1f
1 changed files with 3 additions and 16 deletions
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19
net/dsa/dsa2.c
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@ -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;
}