On Tue, Jun 29, 2021 at 01:40:20PM +0300, Nikolay Aleksandrov wrote:

quoted

@@ -117,18 +118,16 @@ br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
 		.is_local = test_bit(BR_FDB_LOCAL, &fdb->flags),
 		.offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags),
 	};
-
-	if (!fdb->dst)
-		return;
+	struct net_device *dev = fdb->dst ? fdb->dst->dev : br->dev;

you should use READ_ONCE() for fdb->dst here to make sure it's read only once,
to be fair the old code had the same issue :)

Thanks for the comment. I still have budget for one patch until I hit
the 15 limit, so I guess I'll do that separately before this one.
Just trying to make sure I get it right. You want me to annotate
fdb_create(), br_fdb_update(), fdb_add_entry() and
br_fdb_external_learn_add() with WRITE_ONCE() too, right?
Can I resend right away or did you notice other issues in the other
patches?