net: dsa: tag_{e}dsa.c: Remove dependency on platform data

The platform data nr_chips is used when validating a received packet,
to ensure it comes from a know switch chip. The number of possible
switches is limited to DSA_MAX_SWITCHES, so use this as the first
validation step. The new binding allows holes in the dst->ds[] array,
so also ensure ensure there is a valid dsa_switch for this packet.

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

net/dsa/tag_dsa.c

@@ -107,9 +107,13 @@ static int dsa_rcv(struct sk_buff *skb, struct net_device *dev,
 	 * Check that the source device exists and that the source
 	 * port is a registered DSA port.
 	 */
-	if (source_device >= dst->pd->nr_chips)
+	if (source_device >= DSA_MAX_SWITCHES)
 		goto out_drop;
+
 	ds = dst->ds[source_device];
+	if (!ds)
+		goto out_drop;
+
 	if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
 		goto out_drop;
 

net/dsa/tag_edsa.c

@@ -120,9 +120,13 @@ static int edsa_rcv(struct sk_buff *skb, struct net_device *dev,
 	 * Check that the source device exists and that the source
 	 * port is a registered DSA port.
 	 */
-	if (source_device >= dst->pd->nr_chips)
+	if (source_device >= DSA_MAX_SWITCHES)
 		goto out_drop;
+
 	ds = dst->ds[source_device];
+	if (!ds)
+		goto out_drop;
+
 	if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
 		goto out_drop;