net: dsa: simplify tree reference counting

DSA trees have a refcount used to automatically free the dsa_switch_tree
structure once there is no switch devices inside of it.

The refcount is incremented when a switch is added to the tree, and
decremented when it is removed from it.

But because of kref_init, the refcount is also incremented at
initialization, and when looking up the tree from the list for symmetry.

Thus the current code stores the number of switches plus one, and makes
the switch registration more complex.

To simplify the switch registration function, we reset the refcount to
zero after initialization and don't increment it when looking up a tree.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dsa/dsa2.c

@@ -32,10 +32,9 @@ static struct dsa_switch_tree *dsa_get_dst(unsigned int index)
 	struct dsa_switch_tree *dst;
 
 	list_for_each_entry(dst, &dsa_switch_trees, list)
-		if (dst->index == index) {
-			kref_get(&dst->refcount);
+		if (dst->index == index)
 			return dst;
-		}
+
 	return NULL;
 }
 
@@ -48,11 +47,6 @@ static void dsa_free_dst(struct kref *ref)
 	kfree(dst);
 }
 
-static void dsa_put_dst(struct dsa_switch_tree *dst)
-{
-	kref_put(&dst->refcount, dsa_free_dst);
-}
-
 static struct dsa_switch_tree *dsa_add_dst(unsigned int index)
 {
 	struct dsa_switch_tree *dst;
@@ -63,7 +57,10 @@ static struct dsa_switch_tree *dsa_add_dst(unsigned int index)
 	dst->index = index;
 	INIT_LIST_HEAD(&dst->list);
 	list_add_tail(&dsa_switch_trees, &dst->list);
+
+	/* Initialize the reference counter to the number of switches, not 1 */
 	kref_init(&dst->refcount);
+	refcount_set(&dst->refcount.refcount, 0);
 
 	return dst;
 }
@@ -739,10 +736,8 @@ static int _dsa_register_switch(struct dsa_switch *ds)
 			return -ENOMEM;
 	}
 
-	if (dst->ds[index]) {
-		err = -EBUSY;
-		goto out;
-	}
+	if (dst->ds[index])
+		return -EBUSY;
 
 	ds->dst = dst;
 	ds->index = index;
@@ -758,11 +753,9 @@ static int _dsa_register_switch(struct dsa_switch *ds)
 	if (err < 0)
 		goto out_del_dst;
 
-	if (err == 1) {
-		/* Not all switches registered yet */
-		err = 0;
-		goto out;
-	}
+	/* Not all switches registered yet */
+	if (err == 1)
+		return 0;
 
 	if (dst->applied) {
 		pr_info("DSA: Disjoint trees?\n");
@@ -779,13 +772,10 @@ static int _dsa_register_switch(struct dsa_switch *ds)
 		goto out_del_dst;
 	}
 
-	dsa_put_dst(dst);
 	return 0;
 
 out_del_dst:
 	dsa_dst_del_ds(dst, ds, ds->index);
-out:
-	dsa_put_dst(dst);
 
 	return err;
 }