netdev - [PATCH net-next 1/6] net: dsa: warn if port lists aren't empty in dsa_port

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Date:   Tue,  8 Mar 2022 11:15:10 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Alvin Šipraga <alsi@...g-olufsen.dk>
Subject: [PATCH net-next 1/6] 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 <vladimir.oltean@....com>
---
 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 afea4f7a41c0..396ea0b4291a 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;
 }
-- 
2.25.1